Ieee 2013 power electronics project titles

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PE01 A   Current Controller Design for Current Source Inverter-Fed AC Machine Drive   System Abstract—A   current source inverter (CSI) requires a capacitor filter for the commutation   of switching device as well as for attenuating switching harmonics. Hence,   the CSI-fed ac machine has a second-order system in the continuous time   domain. This paper presents a design methodology for the closed-loop current   controller of the CSI-fed ac machine drive system. A multiloop current controller   design using a pole/zero cancellation method is employed with a transfer   function matrix. To decouple the crosscoupling terms which cause mutual   interferences between the dand q-axes in the    synchronous reference frame, two types of controller are proposed and   implemented using different decoupling method. Additionally, active damping   methods are incorporated to  enhance   the stability of the system. A stability analysis in discretetime domain is   investigated to verify the feasibility of the proposed closed-loop current   controller. To evaluate the effectiveness of the proposed current controller,   computer simulations and experimental tests were performed and the results   are discussed. IEEE   2013
PE02 A   DC–DC Converter Based on the Three-State Switching Cell for High Current and   Voltage Step-Down Applications Abstract—This   paper presents a pulsewidth modulation dc–dc nonisolated buck converter using   the three-state switching cell, constituted by two active switches, two   diodes, and two coupled inductors. Only part of the load power is processed   by the active switches, reducing the peak current through the switches to   half of the load current, as higher power levels can then be achieved by the   proposed topology. The volume of reactive elements, i.e., inductors and   capacitors, is also decreased since the ripple frequency of the output   voltage is twice the switching frequency. Due to the intrinsic   characteristics of the topology, total losses are distributed among all   semiconductors. Another advantage of this converter is the reduced region for   discontinuous conduction mode when compared to the conventional buck   converter or, in other words, the operation range in continuous conduction   mode is increased, as demonstrated by the static gain plot. The theoretical approach   is detailed through qualitative and quantitative analyses by the application   of the three-state switching cell to the buck converter operating in   nonoverlapping mode (D < 0.5). Besides, the mathematical analysis and   development of an experimental prototype rated at 1 kW are carried out. The   main experimental results are presented and adequately discussed to clearly   identify its claimed advantages. IEEE   2013
PE03 A   High Step-Down Transformerless Single-Stage Single-Switch AC/DC Converter Abstract—This   paper presents a high step-down tranformerless single-stage single-switch   ac/dc converter suitable for universal line applications (90–270 Vrms ). The   topology integrates a buck-type power-factor correction (PFC) cell with a   buck–boost dc/dc cell and part of the input power is coupled to the output   directly after the first power processing. With this direct power transfer   feature and sharing capacitor voltages, the converter is able to achieve   efficient power conversion, high power factor, low voltage stress on   intermediate bus (less than 130 V) and low output voltage without a high   step-down transformer. The absence of transformer reduces the component   counts and cost of the converter. Unlike most of the boost-type PFC cell, the   main switch of the proposed converter only handles the peak inductor current   of dc/dc cell rather than the superposition of both inductor currents.   Detailed analysis and design procedures of the proposed circuit are given and   verified by experimental results. IEEE   2013
PE04 A   High Step-Up Converter With a Voltage Multiplier Module for a Photovoltaic   System Abstract—Anovel   high step-up converter is proposed for a frontend photovoltaic system.   Through a voltage multiplier module, an asymmetrical interleaved high step-up   converter obtains high stepup gain without operating at an extreme duty   ratio. The voltage multiplier module is composed of a conventional boost   converter and coupled inductors. An extra conventional boost converter is   integrated into the first phase to achieve a considerably higher voltage   conversion ratio. The two-phase configuration not only reduces the current   stress through each power switch, but also constrains the input current   ripple, which decreases the conduction losses of metal–oxide–semiconductor   field-effect transistors (MOSFETs). In addition, the proposed converter   functions as an active clamp circuit, which alleviates large voltage spikes   across the power switches. Thus, the low-voltage-rated MOSFETs can be adopted   for reductions of conduction losses and cost. Efficiency improves because the   energy stored in leakage inductances is recycled to the output terminal.   Finally, the prototype circuit with a 40-V input voltage, 380-V output, and   1000- W output power is operated to verify its performance. The highest   efficiency is 96.8%. IEEE   2013
PE05 A   High-Performance SPWM Controller for Three-Phase UPS Systems Operating Under   Highly Nonlinear Loads Abstract—This   paper presents the design of a high-performance sinusoidal pulsewidth   modulation (SPWM) controller for threephase uninterruptible power supply   (UPS) systems that are operating under highly nonlinear loads. The classical   SPWM method is quite effective in controlling the RMS magnitude of the UPS   output voltages. However, it is not good enough in compensating the harmonics   and the distortion caused specifically by the nonlinear currents drawn by the   rectifier loads. The distortion becomes more severe at high power where the   switching frequency has to be reduced due to the efficiency concerns. This   study proposes a new design strategy that overcomes the limitations of the   classical RMS control. It adds inner loops to the closed-loop control system   effectively that enables successful reduction of harmonics and compensation   of distortion at the outputs. Simulink is used to analyze, develop, and   design the controller using the state-space model of the inverter. The   controller is implemented in the TMS320F2808 DSP by Texas Instruments, and   the performance is evaluated experimentally using a three-phase 10 kVA transformer   isolated UPS under all types of load conditions. In conclusion, the   experimental results demonstrate that the controller successfully achieves   the steady-state RMS voltage regulation specifications as well as the total   harmonic distortion and the dynamic response requirements of major UPS   standards. (Index   Terms—Inverter, nonlinear load, sinusoidal pulsewidth modulation (PWM)   control, uninterruptible power supply (UPS).) IEEE   2013
PE06 A   New Control Method of Interleaved Single-Stage Flyback AC–DC Converter for   Outdoor LED Lighting Systems Abstract—In   outdoor light-emitting diode (LED) lighting systems, there are a lot of   applications. Depending on the output power rating, the power stage to drive   an LED can be classified into single-stage and two-stage structures. The   single-stage structure is for low-power LED lighting applications. However,   it is difficult to apply at over 60–70 W of output power because of its low   efficiency and huge transformer at high power. On the other hand, the   two-stage structure is usually used for high power applications. However, it   is undesirable to cover wide output power range because of its poor power   factor (PF) under the light load condition. To solve these problems, this   paper proposes a new pulse duty cycle control method with pulse frequency   modulation for an interleaved single-stage flyback ac–dc converter. The   proposed converter provides high efficiency under heavy loads with low ac   line condition and under light loads with high ac line condition. In   addition, the proposed converter shows high PF and low total harmonic   distortion even when the output power is very low. As a result, a single LED   ac–dc converter can cover wide power range for outdoor LED lighting   applications. To verify the validity of the proposed converter, an 81-W   prototype converter has been implemented and experimented on. (Index   Terms—Frequency control, interleaved flyback, lightemitting diode (LED),   power factor correction (PFC), single-stage, total harmonic distortion   (THD).) IEEE   2013
PE07 A   New DC Anti-Islanding Technique of Electrolytic Capacitor-Less Photovoltaic   Interface in DC Distribution Systems Abstract—This   paper proposes a photovoltaic (PV) generation system interfaced with a dc   distribution system. DC interface allows for the improvement of system   efficiency by fully utilizing dc-based renewable sources and storage devices.   In this paper,issues on PV interface for dc distribution systems are   discussed for energy-efficient and reliable system implementation. AC and dc   PV interfaces are mathematically analyzed. In dc distribution, eliminating   electrolytic capacitors in PV interfaces improves system reliability,   increases system efficiency, and reduces cost. In addition, this paper   proposes a new anti-islanding technique for dc distribution as a system   protection scheme. The operating principle is presented in detail and   analysis shows that the proposed injected current perturbation technique is   an effective solution for anti-islanding operation. A prototype converter   features a simple structure with no electrolytic capacitor, which ensures a   longer lifetime of the PV power circuit. Experimental results of the   prototype circuit show a maximum efficiency of 98.1% and a European   efficiency of 97.5%. The proposed anti-islanding technique shows fast   response to the islanding condition in less than 0.2 s. It also shows that   the average maximum power point tracking efficiency is 99.9% in normal   conditions, which verifies the performance of the proposed scheme. (Index   Terms—Anti-islanding, building integrated photovoltaic (BIPV), dc   distribution, islanding, photovoltaic (PV).) IEEE   2013
PE08 A   Single-Phase Grid-Connected Fuel Cell System Based on a Boost-Inverter Abstract—In   this paper, the boost-inverter topology is used as a building block for a   single-phase grid-connected fuel cell (FC) system offering low cost and   compactness. In addition, the proposed system incorporates battery-based   energy storage and a dc–dc bidirectional converter to support the slow   dynamics of the FC. The single-phase boost inverter is voltage-mode   controlled and the dc–dc bidirectional converter is current-mode controlled.   The low-frequency current ripple is supplied by the battery whichminimizes   the effects of such ripple being drawn directly from the FC itself.Moreover,   this system can operate either in a grid-connected or stand-alone mode. In   the grid-connected mode, the boost inverter is able to control the active (P)   and reactive (Q) powers using an algorithm based on a second-order   generalized integrator which provides a fast signal conditioning for   single-phase systems. Design guidelines, simulation, and experimental results   taken from a laboratory prototype are presented to confirm the performance of   the proposed system. (Index   Terms—Boost inverter, fuel cell, grid-connected inverter, power conditioning   system (PCS), PQ control.) IEEE   2013
PE09 A   Three-Level Converter With Reduced Filter Size Using Two Transformers and   Flying  Capacitors Abstract—This   paper proposes a pulse-width modulation threelevel converter with reduced   filter size using two transformers. The proposed converter hasmany   advantages. All switches sustain only the half of the input voltage and since   the secondary rectified voltage is a three-level waveform, the output filter   inductor can be reduced. Also, because of the power sharing of transformer   and reduced output inductor, high efficiency can be obtained. The operational   principle, analysis, and design considerations of the proposed converter are   presented in this paper. The validity of this study is confirmed by the   experimental results from a prototype with 600W, 500–600V input, and 60V   output. (Index   Terms—Reduced filter size, three-level converter.) IEEE   2013
PE10 Adaptive   Dead-Time Compensation for Grid-Connected PWM Inverters of Single-Stage PV   Systems Abstract—This   study presents a new software-based plug-in dead-time compensator for   grid-connected pulsewidth modulated voltage-source inverters of single-stage   photovoltaic (PV) systems using predictive current controllers (PCCs) to   regulate phase currents. First, a nonlinear dead-time disturbance model is   reviewed, which is then used for the generation of a feed-forward   compensation signal that eliminates the current distortion associated with   current clamping effects around zero-current crossing points. A novel   closed-loop adaptive adjustment scheme is proposed for fine tuning in real   time the compensation model parameters, thereby ensuring accurate results   even under the highly varying operating conditions typically found in PV systems   due to insolation, temperature, and shadowing effects, among others. The   algorithm implementation is straightforward and computationally efficient,   and can be easily attached to an existent PCC to enhance its dead-time   rejection capabilitywithout modifying its internal structure. Experimental   results with a 5-kW PV system prototype are presented.  (Index   Terms—Current-controlled voltage-source inverter (CCVSI), dead-time   compensation, grid-connected pulsewidth modulated (PWM) inverter, harmonic   distortion, predictive current control (PCC), single-stage photovoltaic (PV)   system.) IEEE   2013
PE11 Adaptive   Theory-Based Improved Linear Sinusoidal Tracer Control Algorithm for DSTATCOM Abstract—This   paper presents a hardware implementation of three-phase distribution static   compensator (DSTATCOM) using an adaptive theory-based improved linear   sinusoidal tracer (ILST) control algorithm for different functions of   DSTATCOM such as reactive power compensation for power factor correction,   harmonics elimination, load balancing, and zero-voltage regulation under   linear/nonlinear loads.AnILST-based control algorithm is used for the   extraction of fundamental load currents and their active and reactive power   components. These components are used for the estimation of reference source   currents. A prototype of DSTATCOM is developed and its real-time performance   is studied using a digital signal processor. The performance of DSTATCOM is   found satisfactory with the proposed control algorithm under various types of   loads. (Index   Terms—Improved linear sinusoidal tracer (ILST) control algorithm, power   factor correction (PFC), power quality, reactive power, voltage source   converter (VSC), zero voltage regulation (ZVR).) IEEE   2013
PE12 Adaptive   Voltage Control of the DC/DC Boost Stage in PV Converters With Small Input   Capacitor Abstract—In   the case of photovoltaic (PV) systems, an adequate PV voltage regulation is   fundamental in order to both maximize and limit the power. For this purpose,   a large input capacitor has traditionally been used. However, when reducing   that capacitor’s size, the nonlinearities of the PV array make the   performance of the voltage regulation become highly dependent on the   operating point. This paper analyzes the nonlinear characteristics of the PV   generator and clearly states their effect on the control of the dc/dc boost   stage of commercial converters by means of a linearization around the   operating point. Then, it proposes an adaptive control, which enables the use   of a small input capacitor preserving at the same time the performance of the   original system with a large capacitor. Experimental results are carried out   for a commercial converter with a 40 μF input capacitor, and a 4 kWPV array.   The results corroborate the theoretical analysis; they evidence the problems   of the traditional control, and validate the proposed control with such a   small capacitor.  (Index   Terms—Adaptive control, photovoltaic converters, photovoltaic power systems,   small-signal modeling, voltage control.) IEEE   2013
PE13 An   Adaptive Output Current Estimation Circuit for a Primary-Side Controlled LED   Driver Abstract—A   primary-side controlled method is commonly used in flyback LED driver to   regulate output current by employing an auxiliary winding. However, owing to   intrinsic propagation delay in real-world circuits, a primary-side controlled   flyback converter experiences a worse line regulation. This paper proposes a   smart output current estimation scheme to improve line regulation for   constant on-time control, and it can be compatible with the current flyback   topology. A 9.5-W prototype of the proposed flyback LED driver has been   fabricated in Nuvoton Technology Corporation 0.6-μm 5-V/40-V CMOS process.   The maximum switching frequency is set to around 100 kHz with universal-line   input, single-stage power factor correction for LED lighting applications.   Experimental results prove that the proposed scheme can improve the line   regulation within 1.5% and the power efficiency can be up to 89.7%. (Index   Terms—Flyback converter, light-emitting diode (LED) driver, line regulation,   primary-side controlled.) IEEE   2013
PE14 An   Optimal Control Method for Photovoltaic Grid-Tied-Interleaved Flyback   Microinverters to Achieve High Efficiency in Wide Load Range Abstract—Boundary   conduction mode (BCM) and discontinuous conduction mode (DCM) control   strategies are widely used for the flyback microinverter. The BCM and DCM   control strategies are investigated for the interleaved flyback microinverter   concentrating on the loss analysis under different load conditions. These two   control strategies have different impact on the loss distribution and thus   the efficiency of the flyback microinverter. For the interleaved flyback   microinverter, the dominant losses with heavy load include the conduction   loss of the powerMOSFETs and diodes, and the loss of the transformer; while   the dominant losses with light load include the gate driving loss, the   turn-off loss of the power MOSFETs and the transformer core loss. Based on   the loss analysis, a new hybrid control strategy combing the two-phase DCM   and one-phaseDCMcontrol is proposed to improve the efficiency in wide load   range by reducing the dominant losses depending on the load current. The   optimal design method based on the boundary condition of the hybrid control is   also presented. The experimental results verify the benefits of the proposed   control. (Index   Terms—AC module, grid-connected, interleaved flyback, microinverter,   photovoltaic (PV).) IEEE   2013
PE15 Analysis   and Comparison of Medium Voltage High Power DC/DC Converters for Offshore   Wind Energy Systems Abstract—Offshore   wind farm with an internal medium-voltage dc (MVDC)-grid collection connected   HVDC transmission may be an option to harvest offshore wind energy.   High-power MV dc/dc converters with high-step-up conversion ratios are the   key components for the internal MVDC grid. In this paper, a highefficiency   step-up resonant switched-capacitor converter for offshore wind energy system   is studied, which is characterized by the soft-switching condition for all   switches and diodes. This significantly reduces switching losses and higher   switching frequency is feasible to reduce the overall system volume and   weight. The comparisons with other two kinds of topologies are also   presented; moreover, the possible specification requirements of high power MV   dc/dc converters are analyzed and set. The operation principle of the   proposed converter has been successfully verified by simulation and   experiment results. (Index   Terms—High power, medium-voltage dc (MVDC) converter, MVDC grid, offshore   wind farm.) IEEE   2013
PE16 Analysis   and Design of a Push–Pull Quasi-Resonant Boost Power Factor Corrector Abstract—This   paper proposes a novel power-factor corrector (PFC), which is mainly composed   of two-phase transition-mode (TM) boost-type power-factor correctors (PFCs)   and a coupled inductor. By integrating two boost inductors into one magnetic   core, not only the circuit volume is reduced, but also the operating   frequency of the core is double of the switching frequency. Comparing with   single-phase TM boost PFC, both the input and output current ripples of the   proposed PFC can be reduced if the equivalent inductance of the coupled   inductor equals the inductance of singlephase TM boost PFC. Therefore, both   the power-factor value and the power density are increased. The proposed   topology is capable of sharing the input current and output current equally.   A cut-inhalf duty cycle can reduce the conduction losses of the switches and   both the turns and diameters of the inductor windings. The advantages of   aTMboost PFC, such as quasi-resonant (QR) valley switching on the switch and   zero-current switching (ZCS) of the output diode, are maintained to improve   the overall conversion efficiency. Detailed analysis and design procedures of   the proposed topology are given. Simulations and experiments are conducted on   a prototype with a universal line voltage, a 380-V output dc voltage and a   200-W output power to verify its feasibility. (Index   Terms—Coupled inductor, power factor corrector, push– pull topology,   quasi-resonant (QR) converter.) IEEE   2013
PE17 Analysis   of a Fifth-Order Resonant Converter for High-Voltage DC Power Supplies Abstract—Power   transformer is one of the most complex parts of power converters. The   complicated behavior of the transformer is usually neglected in the power   converter analysis and a simple model is mostly used to analyze the   converter. This paper presents a precise analysis of a fifth-order resonant   converter which has incorporated the resonant circuit into the transformer.   The derived model, which is based on the accurate model of the power   transformer, can fully predict the behavior of the fifth-order resonant   converter. The proposed fifth-order resonant converter is able to effectively   reduce the range of phase-shift angle fromno load to full load for a   fixed-frequency phase-shift control approach. Therefore, the converter is   able to operate under zero voltage switching during entire load range with a   fixed-frequency control method. Also, the proposed converter offers a high   gain which leads to a lower transformer turns ratio. A 10-kVDC, 1.1-kW   prototype has been prepared to evaluate the performance of the proposed   converter. The experimental results exhibit the excellent accuracy of the   proposed model and the superiority of the performance compared to the lower   order resonant converters, especially for high-voltage applications. (Index   Terms—Fifth-order resonant converter, high-voltage dc power supply,   phase-shift fixed-frequency control approach, steady state analysis, zero   voltage switching (ZVS) operation.) IEEE   2013
PE18 Analysis,   Design, and Experimental Results of a Novel Soft-Switching Snubberless   Current-Fed Half-Bridge Front-End Converter-Based PV Inverter Abstract—This   paper proposes a new novel snubberless currentfed half-bridge front-end   isolated dc/dc converter-based inverter for photovoltaic applications. It is   suitable for grid-tied (utility interface) as well as off-grid (standalone)   application based on the mode of control. The proposed converter attains   clamping of the device voltage by secondary modulation, thus eliminating the   need of snubber or active-clamp. Zero-current switching or natural   commutation of primary devices and zero-voltage switching of secondary   devices is achieved. Soft-switching is inherent owing to the proposed   secondary modulation and is maintained during wide variation in voltage and   power transfer capacity and thus is suitable for photovoltaic (PV)   applications. Primary device voltage is clamped at reflected output voltage,   and secondary device voltage is clamped at output voltage. Steady-state   operation and analysis, and design procedure are presented. Simulation   results using PSIM 9.0 are given to verify the proposed analysis and design.   An experimental converter prototype rated at 200 W has been designed, built,   and tested in the laboratory to verify and demonstrate the converter   performance over wide variations in input voltage and output power for PV   applications. The proposed converter is a true isolated boost converter and   has higher voltage conversion (boost) ratio compared to the conventional   active-clamped converter. (Index   Terms—Current-fed converter, high frequency, photovoltaic (PV) inverter,   renewable energy system, soft-switching.) IEEE   2013
PE19 Application   and Stability Analysis of a Novel Digital Active EMI Filter Used in a   Grid-Tied PV Microinverter Module Abstract—This   paper presents a novel technique to suppress common-mode electromagnetic   interference (EMI) using a digital active EMI filter (DAEF). The DAEF control   technique is concurrently implemented with a digital controller of a   grid-tied photovoltaic microinverter. A brief description of the   microinverter architecture and its inverter circuit is illustrated. The   inverter stability is investigated using the overall transfer function.   Accordingly, the system compensation is designed based on the direct quadrant   (DQ) reference frame control technique. Finally, the proposed digital   controller is tested on a grid-connected 200-W dc–ac microinverter. The experiment   results validate the effectiveness of the proposed technique. Compared with   the conventional passive EMIfilter, the proposed digital controller can   achieve an equivalent or better performance in terms of EMI suppression and   maintain stability within the operation bandwidth. Therefore, the embedded   DAEF can significantly reduce the size, cost, and space of the overall power   inverter printed circuit board without the need of a conventional passive EMI   filter. (Index   Terms—Digital filters, electromagnetic compatibility (EMC), electromagnetic   interference (EMI) suppression, microinverter, photovoltaic (PV).) IEEE   2013
PE20 Asymmetric   Control of DC-Link Voltages for Separate MPPTs in Three-Level Inverters Abstract—It   is important to improve the overall efficiency of a photovoltaic (PV)   inverter when it is connected to the grid. Fundamentally, the conversion   efficiency from dc to ac power of an inverter is important. However, in the   presence of partial shading, maximum power point tracking (MPPT) on PV modules   is more important than the conversion efficiency. In this paper, a new   control method for a three-level inverter is proposed.With the proposed   method, each dc-link voltage of the three-level inverter can be   asymmetrically regulated. When PV modules are split into two and each split   module is connected to the respective dc-link capacitors of the inverter, the   asymmetric control can be helpful because separateMPPTs are possible. The   effectiveness of the proposed method was examined through experiments with a   T-type three-level inverter, where each dc-link capacitor was supplied by a   PVsimulator emulating two separate PVmodules under different shading   conditions. (Index   Terms—Asymmetric voltage control, grid-connected inverter, maximum power   point tracking (MPPT), photovoltaic (PV), three-level inverter.) IEEE   2013
PE21 Battery/Supercapacitors   Combination in Uninterruptible Power Supply (UPS) Abstract—This   study presents a study of the reduction in battery stresses by using   supercapacitors (SCs) in a 500-kVA rated UPS. We aim at investigating the   optimal supercapacitors-battery combination versus the SCs cost. This   investigation is threefold; first, supercapacitors and battery models   developed using MATLAB/Simulink are presented and validated. Second, the   architecture and the simulation of the designed system that combines the SCs   and the battery are shown. The supercapacitors are used as high-power storage   devices to smooth the peak power applied to the battery during backup time   and to deliver full power during short grid outages. By charging the SCs   through the battery at a suitable rate, all impulse power demands would be   satisfied by the supercapacitors. Third, extensive simulations are carried   out to determine the gain in batteryRMS current, the gain in energy losses,   the energy efficiency and the elimination rate of surge load power. These   four performance parameters are determined by simulation and then analyzed.   The influence of the SCs recharge on the performance indicators is   highlighted. A thorough analysis involving optimal study proposes to draw the   optimal SCs number and filter constant from the variation of the   aforementioned parameters versus the cost of the SCs. (Index   Terms—Hybrid power sources, lead-acid battery, supercapacitors, uninterruptible   power supply (UPS).) IEEE   2013
PE22 Bridgeless   SEPIC Converter With a Ripple-Free Input Current Abstract—Conventional   power factor correction (PFC) singleended primary inductor converter (SEPIC)   suffers from high conduction loss at the input bridge diode. To solve this   problem, a bridgeless SEPIC converter with ripple-free input current is   proposed. In the proposed converter, the input bridge diode is removed and   the conduction loss is reduced. In addition, the input current ripple is   significantly reduced by utilizing an additional winding of the input   inductor and an auxiliary capacitor. Similar to the conventional PFC SEPIC   converter, the input current in a switching period is proportional to the   input voltage and near unity power is achieved. The operational principles,   steady-state analysis, and design equations of the proposed converter are   described in detail. Experimental results from a 130Wprototype at a constant   switching frequency of 100 kHz are presented to verify the performance of the   proposed converter. (Index   Terms—Bridgeless converter, coupled inductor, power factor correction (PFC),   single-ended primary inductor converter (SEPIC).) IEEE   2013
PE23 Cascaded   Multicell Trans-Z-Source Inverters Abstract—Inverters   with high-output voltage gain usually face the problem of high-input current   flowing through their components. The problem might further be exaggerated if   the inverters use high-frequency magnetic devices like transformers or   coupled inductors. Leakage inductances of these devices must strictly be   small to prevent overvoltages caused by switching of their winding currents.   To avoid these related problems, cascaded trans-Z-source inverters are   proposed. They use multiple magnetic cells in an alternately cascading   pattern rather than a single magnetic cell with large turns ratio. Simulation   and experimental results have shown that the multicell inverters can produce   the same high-voltage gain, while keeping currents and voltages of the   components low. The inverters can also step down their output voltages like a   traditional voltage-source inverter without compromising waveform quality. (Index   Terms—Cascaded inverters, coupled inductors, highfrequency magnetic,   transformers, Z-source inverters.) IEEE   2013
PE24 Class-D/DE   Dual-Mode-Operation Resonant Converter for Improved-Efficiency Domestic   Induction Heating System Abstract—Induction   heating (IH) technology is nowadays widely present in domestic appliances   because of its cleanness, high efficiency, and faster heating process. All of   these advantages are due to its heating process, where the pot is directly   heated by the induced currents generatedwith a varyingmagnetic field.As a   result, the glass where the pot is supported is not directly heated and,   consequently, efficiency and heating times are improved. IH systems are based   on dc-link inverters to generate the required alternating current to feed the   inductor. Usually, resonant converters are used to achieve higher   efficiencies and power densities. In such systems, themaximum output power   and efficiency are achieved at the resonant frequency, and the switching   frequency is increased to reduce the output power. As a consequence, in these   converters, the efficiency is also reduced in the low-medium output power   range. This paper proposes the use of the half-bridge inverter in two   operating modes to achieve higher efficiency in a wide output power range.   The power converter topology can be reconfigured by changing the resonant   capacitors through electromechanical relays. As a consequence, the entire   efficiency of the cooking process is improved with a cost-effective   procedure.(Index   Terms—Induction heating (IH), inverter, resonant power conversion.) IEEE   2013
PE25 Common-Mode   Voltage Reduction Methods for Current-Source Converters in Medium-Voltage   Drives Abstract—Common-mode   voltages (CMVs) can lead to premature failure of the motor insulation system   in medium-voltage current-source-fed drives. By analyzing the CMV values at   all switching states under different operating conditions of a   currentsource-inverter (CSI)-based motor drive, this paper first indicates   that the CMV peaks are produced by the zero states in most of the cases. The   nonzero-state (NZS) modulation techniques employed in voltage-source   converters are adapted for use in a spacevector- modulated current-source   converter (CSC) to reduce the CMV magnitude. For NZS modulation in CSCs, the   nearest threestate (NTS) modulation sequences are designed with good loworder   harmonic performances in their linear modulation region of ma ≥ 0.67 and with   no increase in the device switching frequency. A combined active-zero-state   (AZS) modulation technique is also proposed as compensation, for a lower   modulation index in the range of 0.4–0.67, when a compromise is made between   the dc-link current minimization and high input power factor control. The   simulation and experimental results are provided to validate the CMV   reduction effects and harmonic performances of the NTS and combined AZS   modulation methods in CSI-fed drives. (Index   Terms—Active-zero-state (AZS) modulation, commonmode voltage (CMV),   current-source converter (CSC), nearest three-state (NTS) modulation,   nonzero-state (NZS) modulation.) IEEE   2013
PE26 Control   of Improved Full-Bridge Three-Level DC/DC Converter for Wind Turbines in a DC   Grid Abstract—This   paper presents an improved full-bridge threelevel (IFBTL) dc/dc converter for   a wind turbine in a dc grid by inserting a passive filter into the dc/dc   converter to improve the performance of the converter. The passive filter can   effectively reduce the voltage stress of the medium frequency transformer in   the IFBTL dc/dc converter. A modulation strategy, including two operation   modes, is proposed for the IFBTL dc/dc converter. Then, a voltage balancing   control strategy is proposed for the IFBTL dc/dc converter. Furthermore, the   control of thewind turbine based on the IFBTL dc/dc converter in a dc-grid   system is presented. Finally, a small-scale IFBTL dc/dc converter prototype   was built and tested in the laboratory, and the results verify the   theoretical analysis. (Index   Terms—DC/DC converter, dc grid, full-bridge three-level (FBTL),   permanentmagnet synchronous generator, wind turbines.) IEEE   2013
PE27 DC-Voltage   Fluctuation Elimination Through a DC-Capacitor Current Control for DFIG   Converters Under Unbalanced Grid Voltage Conditions Abstract—Unbalanced   grid voltage causes a large second-order harmonic current in the dc-link   capacitors as well as dc-voltage fluctuation, which potentially will degrade   the lifespan and reliability of the capacitors in voltage source converters.   This paper proposes a novel dc-capacitor current control method for a   grid-side converter (GSC) to eliminate the negative impact of unbalanced grid   voltage on the dc-capacitors. In this method, a dccapacitor current control   loop,where a negative-sequence resonant controller is used to increase the   loop gain, is added to the conventional GSC current control loop. The   rejection capability to the unbalanced grid voltage and the stability of the   proposed control system are discussed. The second-order harmonic current in   the dc capacitor as well as dc-voltage fluctuation is very well eliminated.   Hence, the dc capacitors will be more reliable under unbalanced grid voltage   conditions. A modular implementation method of the proposed control strategy   is developed for the DFIG controller. Finally, experiments are presented to   validate the theoretical analysis. (Index   Terms—Control analysis, dc-capacitor current, doubly fed induction generator   (DFIG), resonant controller, unbalanced grid voltage.) IEEE   2013
PE28 Design   and Implementation of Energy Management System With Fuzzy Control for DC   Microgrid Systems Abstract—This   paper presents the design and implementation of an energy management system   (EMS) with fuzzy control for a dc microgrid system.Modeling, analysis, and   control of distributed power sources and energy storage devices   withMATLAB/Simulink are proposed, and the integrated monitoring EMS is   implemented with LabVIEW. To improve the life cycle of the battery, fuzzy   control manages the desired state of charge. The RS-485/ZigBee network has   been designed to control the operating mode and to monitor the values of all   subsystems in the dc microgrid system. (Index   Terms—Energy management system (EMS), fuzzy control, microgrid.) IEEE   2013
PE29 Design   Methodology for a Very High Frequency Resonant Boost Converter Abstract—This   paper introduces a designmethodology for a resonant boost converter topology   that is suitable for operation at very high frequencies. The topology we   examine features a low parts count and fast transient response, but suffers   from higher device stresses compared to other topologies that use a larger   number of passive components.Anumerical design procedure is developed for   this topology that does not rely on time-domain simulation sweeps across   parameters. This allows the optimal converter design to be found for a   particular main semiconductor switch. If an integrated power process is used   where the designer has control over layout of the semiconductor switch, the   optimal combination of converter design and semiconductor layout can be   found. To validate the proposed converter topology and design approach, a   75-MHz prototype converter is designed and experimentally demonstrated. The   performance of the prototype closely matches that predicted by the design   procedure, and the converter achieves good efficiency over a wide input   voltage range. (Index   Terms—DC-DC power converters, power transistors, RLC circuits, schottky   diodes, tuned circutis.) IEEE   2013
PE30 Design   Optimization of Transformerless Grid-Connected PV Inverters Including   Reliability Abstract—This   paper presents a new methodology for optimal design of transformerless   photovoltaic (PV) inverters targeting a cost-effective deployment of grid-connected   PV systems. The optimal switching frequency as well as the optimal values and   types of the PV inverter components is calculated such that the PV inverter   LCOE generated during the PV system lifetime period is minimized. The LCOE is   also calculated considering the failure rates of the components, which affect   the reliability performance and lifetime maintenance cost of the PV inverter.   A design example is presented, demonstrating that compared to the   nonoptimized PV inverter structures, the PV inverters designed using the   proposed optimization methodology exhibit lower total manufacturing and   lifetime maintenance cost and inject more energy into the electricgrid and by   that minimizing LCOE. (Index   Terms—DC–AC power conversion, failure analysis, optimization methods,   photovoltaic (PV) power systems, reliability.) IEEE   2013
PE31 Design,   Analysis, and Implementation of Solar Power Optimizer for DC Distribution   System Abstract—This   paper proposes a high step-up solar power optimizer (SPO) that efficiently   harvests maximum energy from a photovoltaic (PV) panel then outputs energy to   a dc-microgrid. Its structure integrates coupled inductor and switched   capacitor technologies to realize high step-up voltage gain. The leakage   inductance energy of the coupled inductor can be recycled to reduce voltage   stress and power losses. A low voltage rating and low-conduction resistance   switch improves system efficiency by employing the incremental conductance   method for the maximum power point tracking (MPPT) algorithm. Because of its   high tracking accuracy, the method is widely used in the energy harvesting of   PV systems. laboratory prototypes of the proposed SPO that have an input   voltage range of 20 to 40 V and a maximum PV output power of 400 V/300 W are   applied. The highest PV power conversion efficiency is 96.7%. The maximum   MPPT accuracy is 99.9%, and the full load average MPPT accuracy is 97.8%. (Index   Terms—High step-up voltage gain, maximu tracking (MPPT), solar power   optimizer (SPO).) IEEE   2013
PE32 Development   and Operational Control of Two-String Maximum Power Point Trackers in DC   Distribution Systems Abstract—This   paper develops the operational control of two maximum power point trackers   (MPPTs) for two-string photovoltaic (PV) panels in dc distribution systems.   This dc distribution system is connected to ac grid via a bidirectional   inverter. Two PV strings and two MPPTs are implemented in this system. The   proposed MPPT topology consists of buck and boost converters to deal with   wide output voltage range of PV panels. To accurately determine the input   current of MPPTs, the PV-string configuration check is accomplished online.   The perturbation and observation method are applied for maximum power point   tracking. Moreover, the current balancing of two MPPT modules in parallel is   achieved. In this paper, the system configuration and the operational   principle of the proposed MPPT are first introduced. Afterward, the   perturbation and observation method and the mode transition are demonstrated.   Flowcharts of the online PV-string configuration check and current balancing   are explained. The validity of configuration check and current balancing is   verified via the experimental results. Maximum power tracking performance and   power conversion efficiency are also obtained. (Index   Terms—Current balancing, dc distribution system, maximum power point   tracking, photovoltaic (PV), solar power.) IEEE   2013
PE33 Digital   Plug-In Repetitive Controller for Single-Phase Bridgeless PFC Converters Abstract—This   paper investigates a plug-in repetitive control scheme for bridgeless power   factor correction (PFC) converters to mitigate input current distortions   under continuous conduction mode and discontinuous conduction mode operating   conditions. From the PFC converter model and the fact that a type-II   compensator is used, a design methodology to maximize the bandwidth of the   feedback controller is suggested. After that, the error transfer function   including the feedback controller is derived, and the stability of the   repetitive control scheme is evaluated using the error transfer function. The   implementation of the digital repetitive controller is also discussed. The   simulation and experimental results show that the input current THD is   significantly improved by using the proposed control scheme for a 1-kW   single-phase bridgeless PFC converter prototype. (Index   Terms—AC–DC converters, bridgeless power factor correction (PFC) converter,   digital average current control, repetitive control.) IEEE   2013
PE34 Dual   Transformerless Single-Stage Current Source Inverter With Energy Management   Control Strategy Abstract—Alternative   energy sources have for some time attracted great interest in the area of   static converter development. This fact is related in greater part to issues   such as sustainability and detrimental effects on the natural environment,   which all contribute to the viability of this type of energy source. In this   context, power electronics performs important tasks making viable the   connection of all these kind of clean power sources to the conventional grid   and also to the load. From this perspective, a new challenge must be faced   which is the development of energy management systems capable of providing   intelligent planning and control of appliances in low- and high-power   applications. That being so, this paper intends to contribute presenting a   novel dual transformerless single-stage current source inverter fed by a   proton exchange membrane fuel cell (PEMFC) and a photovoltaic (PV) array.   High voltage gain and totally controlled output voltage can be achieved   without using dedicated step-up dc–dc converters or transformers either. The   main feature of this inverter structure is the intelligent power management   technique which focuses on the extraction of maximum power from the PV array   keeping the PEMFC as an energy storage system. Theoretical analysis is   presented and corroborated by experimental results of a 400Wlaboratory   prototype. (IndexTerms—Buck–boost,   current source inverter (CSI), energy management, fuel cell (FC), inverters,   photovoltaic (PV), singlestage, transformerless.) IEEE   2013
PE35 Electric   Equivalent Model for Induction Electrodeless Fluorescent Lamps Abstract—This   paper presents an electric equivalent model applied to induction   electrodeless fluorescent lamps. The model is based on passive components and   takes into account the real and reactive lamp power. The presented model and   its obtention methodology will be an important tool for ballast designers.   One of the most important features of the proposed methodology is the concern   regarding core losses and lamp reactive characteristics, because nowadays   there are no electricmodels including these characteristics. In order to   obtain and validate the electrodeless lamp model, a series–parallel resonant   half-bridge inverter is used as ballast. Plasma and lamp windings are modeled   as resistances and reactances depending on the lamp power. Simulations   employing the proposed model are also presented, showing an excellent   agreement with experimental results. (Index   Terms—Electrodeless fluorescent lamps, equivalent model, high frequency.) IEEE   2013
PE36 Enhanced   Control of a DFIG-Based Wind-Power Generation System With Series Grid-Side   Converter Under Unbalanced Grid Voltage Conditions Abstract—This   paper presents an enhanced control method for a doubly fed induction   generator (DFIG)-based wind-power generation system with series grid-side   converter (SGSC) under unbalanced grid voltage conditions. The behaviors of   the DFIG system with SGSC during network unbalance are described. By   injecting a series control voltage generated from the SGSC to balance the   stator voltage, the adverse effects of voltage unbalance upon the DFIG, such   as stator and rotor current unbalances, electromagnetic torque, and power   pulsations, can be removed, and then the conventional vector control strategy   for the rotor-side converter remains in full force under unbalanced   conditions. Meanwhile, three control targets for the parallel grid-side   converter (PGSC) are identified, including eliminating the oscillations in   the total active power or reactive power, or eliminating negative-sequence   current injected to the grid. Furthermore, a precise current reference   generation strategy for the PGSC has been proposed for the PGSC to further   improve the operation performance of the whole system. Finally, the proposed   coordinated control strategy for the DFIG system with SGSC has been validated   by the simulation results of a 2-MW-DFIG-based wind turbine with SGSC and   experimental results on a laboratory-scale experimental rig under small   steady-state grid voltage unbalance. (Index   Terms—Doubly fed induction generator (DFIG), enhanced control, grid voltage   unbalance, series grid-side converter (SGSC), wind-power generation.) IEEE   2013
PE37 Generalized   Multicell Switched-Inductor and Switched-Capacitor Z-Source Inverters Abstract—Traditional   voltage-source inverter is limited by its only voltage step-down operation,   while current-source inverter is limited by its only current step-down mode.   In order to add an extra boosting flexibility while keeping the number of   active semiconductors unchanged, voltage-type and current-type Z-source   inverters were earlier proposed. These new classes of inverters are generally   more robust and less sensitive to electromagnetic noises. However, their   boosting capabilities are somehow compromised by high component stresses and   poorer spectral performances caused by low modulation ratios. Their boosting   gains are, therefore, limited in practice. To overcome these shortcomings,   the generalized switched-inductor and switched-capacitor Z-source inverters   are proposed,whose extra boosting abilities and other advantages have already   been verified in simulation and experiment. (Index   Terms—Cascaded inverters, multicell inverters, switchedcapacitor (SC),   switched-inductor (SL), Z-source inverters.) IEEE   2013
PE38 Grid   Interfacing of Multimegawatt Photovoltaic Inverters Abstract—This   paper investigates the suitability of selective harmonic elimination (SHE)   for low-loss multimegawatt gridconnected photovoltaic (PV) inverters. The   proposed system is able to meet utilities regulations, IEEE and IEC   standards. In an attempt to substantiate the potential superiority of SHE   over carrier-based or space-vector pulsewidth modulation (PWM), this paper   demonstrates that SHE may allow grid-connected PV inverters to be controlled   using a switching frequency of less than 1 kHz, while the inverter is still   able to provide necessary operation features such as independent control of   active and reactive powers and operation control simplicity. For system   validation, experimental results with SHE are compared to the case when the   inverter is controlled using third-harmonic injection PWM, with a 2-kHz   switching frequency. Furthermore, the paper proposes a new implementation   technique for SHE that utilizes the third harmonics to spread the switching   angles over 90◦ instead of being located in a   narrow range as generated when using conventional techniques, along with   increases in modulation index. The advantages of the proposed technique   include simplicity in implementation and flexibility in PWM waveforms.   Simulation and experimentation demonstrate agreement, which validates the   practicability of the proposed system. (Index   Terms—Grid-connected photovoltaic inverters, highpower medium-voltage   inverters, pulsewidth modulations (PWMs), switching losses.) IEEE   2013
PE39 High   Boost Ratio Hybrid Transformer DC–DC Converter for Photovoltaic Module   Applications Abstract—This   paper presents a nonisolated, high boost ratio hybrid transformer dc–dc   converter with applications for low-voltage renewable energy sources. The proposed   converter utilizes a hybrid transformer to transfer the inductive and   capacitive energy simultaneously, achieving a high boost ratio with a smaller   sized magnetic component. As a result of incorporating the resonant operation   mode into the traditional high boost ratio pulsewidth modulation converter,   the turn-off loss of the switch is reduced, increasing the efficiency of the   converter under all load conditions. The input current ripple and conduction   losses are also reduced because of the hybrid linear-sinusoidal input current   waveforms. The voltage stresses on the active switch and diodes are   maintained at a low level and are independent of the changing input voltage   over a wide range as a result of the resonant capacitor transferring energy   to the output of the converter. The effectiveness of the proposed converter   was experimentally verified using a 220-W prototype circuit. Utilizing an   input voltage ranging from 20 to 45V and a load range of 30–220W, the   experimental results show system of efficiencies greater than 96% with a peak   efficiency of 97.4% at 35-V input, 160-W output. Due to the high system   efficiency and the ability to operate with a wide variable input voltage, the   proposed converter is an attractive design for alternative low dc voltage   energy sources, such as solar photovoltaic modules and fuel cells. (Index   Terms—California energy commission (CEC) efficiency, energy sources with low   dc voltage, European union (EU) efficiency, high boost ratio dc–dc, high   efficiency, hybrid transformer, photovoltaic (PV) module.) IEEE   2013
PE40 High   Power Factor AC–DC LED Driver With Film Capacitors Abstract—In   this paper, a new method is proposed to eliminate electrolytic capacitors in   a two-stage ac–dc light-emitting diode (LED) driver. DC-biased sinusoidal or   square-wave LED drivingcurrent can help to reduce the power imbalance between   ac input and dc output. In doing so, film capacitors can be adopted to   improve LED driver’s lifetime. The relationship between the peakto- average   ratio of the pulsating current in LEDs and the storage capacitance according   to given storage capacitance is derived. Using the proposed “zero-low-level   square-wave driving current” scheme, the storage capacitance in the LED   driver can be reduced to 52.7% comparing with that in the driver using   constant dc driving current. The input power factor is almost unity, which   complies with lighting equipment standards such as IEC-1000-3-2 for Class C   equipments. The voltage across the storage capacitors is analyzed and   verified during the whole pulse width modulation dimming range. For the ease   of dimming and implementation, a 50WLED driver with zero-low-level   square-wave driving current is built and the experimental results are   presented to verify the proposed methods. (Index   Terms—Converters, dimming, LED driver, lighting, pulsating driving current.) IEEE   2013
PE41 High-Efficiency   Asymmetrical Half-Bridge Converter Without Electrolytic Capacitor for   Low-Output-Voltage AC–DC LED Drivers Abstract—Due   to their high reliability and luminous efficacy, high-brightness   light-emitting diodes are being widely used in lighting applications, and   therefore, their power supplies are required to have also high reliability   and efficiency. A very common approach for achieving this in ac–dc applications   is using a two-stage topology. The power factor corrector boost converter   operating in the boundary conduction mode is a very common converter used as   first stage. It is normally designed without electrolytic capacitors,   improving reliability but also increasing the low-frequency ripple of the   output voltage. The asymmetrical half-bridge (AHB) is a perfect option for   the second stage as it has very high efficiency, it operates at constant   switching frequency, and its output filter is small (i.e., it can be also   easily implemented without electrolytic capacitors). Moreover, the AHB is an   excellent candidate for selfdriven synchronous rectification (SD-SR) as its   transformer does not have dead times. However, the standard configuration of   the SD-SR must bemodified in this case in order to deal with the transformer   voltage variations due to the input voltage ripple and, more important, due   to the LED dimming state. This modification is presented in this paper.   Another important issue regarding the AHB is that its closed-loop controller   cannot be very fast and it cannot easily cancel the previously mentioned   low-frequency ripple. In this paper, a feed-forward technique, specifically   designed to overcome this problem, is also presented. The experimental results   obtained with a 60-W topology show that efficiency of the AHB may be very   high (94.5%), while the inherent control problems related to the AHB can be   overcome by the proposed feed-forward technique. (Index   Terms—AC–DC converter, asymmetrical half bridge, dc– dc converter, LED   drivers, low-output voltage, self-driven synchronous rectification (SD-SR).) IEEE   2013
PE42 High-Efficiency   Single-Input Multiple-Output DC–DC Converter Abstract—The   aim of this study is to develop a high-efficiency single-input multiple-output   (SIMO) dc–dc converter. The proposed converter can boost the voltage of a   low-voltage input power source to a controllable high-voltage dc bus and   middle-voltage output terminals. The high-voltage dc bus can take as the main   power for a high-voltage dc load or the front terminal of a dc–ac inverter.   Moreover, middle-voltage output terminals can supply powers for individual   middle-voltage dc loads or for charging auxiliary power sources (e.g.,   battery modules). In this study, a coupled-inductorbased dc–dc converter   scheme utilizes only one power switch with the properties of voltage clamping   and soft switching, and the corresponding device specifications are   adequately designed. As a result, the objectives of high-efficiency power   conversion, high stepup ratio, and various output voltages with different   levels can be obtained. Some experimental results via a kilowatt-level   prototype are given to verify the effectiveness of the proposed SIMO dc–dc   converter in practical applications. (Index   Terms—Coupled inductor, high-efficiency power conversion, single-input   multiple-output (SIMO) converter, soft switching, voltage clamping.) IEEE   2013
PE43 Hybrid-Frequency   Modulation for PWM-Integrated Resonant Converters Abstract—This   paper presents a unique modulation method for extending the input range of   pulse-width modulation (PWM)- integrated resonant converters, such as the   isolated boost resonant converter, while maintaining high conversion   efficiency. The technique includes primarily the hybridizing of constant-on,   constantoff, and fixed-frequency control depending only on the required duty   cycle. The modulation scheme reduces core loss and conduction loss   dramatically by decreasing the applied volt-seconds at the transformer and   improving the switching period utilization. With hybrid-frequency control,   the circuit alsomaintains zero current switching for the output diodes,   minimizes switching loss, and eliminates circulating energy at the   transformer across the entire operating range. It also allows for a   predictable voltage gain, dependent only on duty cycle and transformer turns   ratio. A detailed loss analysis is provided and verified against a 180 W   experimental prototype, with an input range of 12–48 V and a switching   frequency range of 30–70 kHz. Implementation issues are also handled with a   variety of solutions for realizing the modulation scheme. Experimental   results show greater than 4% weighted efficiency improvement in the prototype   using the proposed method. (Index   Terms—DC–DC modulation, integrated boost resonant (IBR) converter) IEEE   2013
PE44 Improved   Sensorless Operation of a CSI-Based Induction Motor Drive: Long Feeder Case Abstract—Various   applications, like in underground mines and oil and gas industries, require   remote operation of vectorcontrolled medium-voltage variable speed drives via   a long motor feeder. The use of voltage source inverters in such cases leads   to motor overvoltage and harmonic quality problems. The current source   inverter (CSI) is ideally matched to these applications because of its   motor-friendly voltage output. Speed sensorless operation is mandatory due to   the longmotor feeder. Although the model reference adaptive system (MRAS) is   a powerful and proven speed estimation tool, its implementation in long motor   feeder drives faces many challenges. Among them, and addressed in this paper,   are inherent dc offset in its stator model, the need for actual motor voltage   and current values, and oscillations in the estimated speed due to errors in   the motor current measurement signals. In this paper, a sensorless CSI   vector-controlled drive, suitable for long motor feeder applications, is   studied. Improved speed estimation is achieved by proposing 1) a modified   dc-offset eliminator for an MRAS speed estimation and 2) a compensation   technique for motor current’s measurement errors. Intensive experimental   results, for a low-voltage scaled model, along with simulations validate the   effectiveness of the proposed technique. (Index   Terms—Current source inverter, long feeder, medium voltage drives, speed   sensor-less.) IEEE   2013
PE45 Improved   Trans-Z-Source Inverter With Continuous Input Current and Boost Inversion   Capability Abstract—This   paper deals with a new family of high boost voltage inverters that improve   upon the conventional trans-Z-source and trans-quasi-Z-source inverters. The   improved trans-Z-source inverter provides continuous input current and a   higher boost voltage  inversion   capability. In addition, the improved inverter can suppress resonant current   at startup, which might destroy the device. In comparison to the conventional   trans-Z-source/-trans-quasi-Zsource inverters, for the same transformer turn   ratio and input and output voltages, the improved inverter has a higher   modulation index with reduced voltage stress on the dc link, lower current   stress flow on the transformer windings and diode, and lower input current   ripple. In order to produce the same input and output voltage with the same   modulation index, the improved inverter uses a lower transformer turn ratio   compared to the conventional inverters. Thus, the size and weight of the   transformer in the improved inverter can be reduced. This paper presents the   operating principles, analysis and simulation results, and compares them with   those of the conventional trans-Z-source/-quasi-Z-source inverters. To verify   the performance of the improved converter, a laboratory prototype was   constructed based on a TMS320F2812 digital signal processor with 100 Vdc   input and 115 Vrms output voltage. (Index   Terms—Boost inversion ability, shoot-through state, trans-Z-source inverter,   transformer, Z-source inverter.) IEEE   2013
PE46 Improved   Voltage-Vector Sequences on Dead-Beat Predictive Direct Power Control of   Reversible Three-Phase Grid-Connected Voltage-Source Converters Abstract—This   paper presents a dead-beat predictive direct power control (DPC) strategy and   its improved voltage-vector sequences for reversible three-phase   grid-connected voltage-source converters (VSCs). The instantaneous variation   rates of active and reactive powers, by applying each converter voltage   vector in 12 different sectors, are deduced and analyzed. Based on the power   variation rates, it is found that the values of the predicted duration times   for the two conventional active converter voltage vectors are less than zero   when the grid-connected VSC operates as either a rectifier or an inverter. In   order to solve this issue, two new alternative vector sequences are proposed   and compared. Experimental results on a 1.5 kW reversible grid-connected VSC system   are presented to validate the feasibility of the proposed voltage-vector   sequences on the dead-beat predictive DPC strategy. (Index   Terms—Dead-beat, direct power control (DPC), duration time, predictive,   vector sequences, voltage-source converter (VSC).) IEEE   2013
PE47 Input   Differential-Mode EMI of CRM Boost PFC Converter Abstract—In   this paper, the differential-mode (DM) electromagnetic interference (EMI)   noise of a single-phase boost power factor correction converter operating in   critical current mode was analyzed. The DM noise spectra are calculated based   on the mathematicalmodel of EMI receiver and the required corner frequencies   of DM filter are obtained. It can be seen that the minimum corner frequencies   are determined by the maximum noises at 150 kHz. With the relation between   the magnitude of the inductor current ripple and theDMnoise, the   characteristics of noise at 150 kHz are obtained by analyzing the current   ripple magnitude at 150 kHz; thus, the worst conditions which have the   maximum noise value are figured out. Meanwhile, the maximum noises at 150 kHz   for different input voltages are identical, so the DM filter can be designed   based on one worst spectrum at one input voltage without testing the spectra   in other conditions. (Index   Terms—Boost converter, critical current mode (CRM), differential mode (DM),   electromagnetic interference (EMI), power factor correction (PFC).) IEEE   2013
PE48 Integration   and Operation of a Single-Phase Bidirectional Inverter With Two Buck/Boost   MPPTs for DC-Distribution Applications Abstract—This   study is focused on integration and operation of a single-phase bidirectional   inverter with two buck/boost maximum power point trackers (MPPTs) for   dc-distribution applications. In a dc-distribution system, a bidirectional   inverter is required to control the power flow between dc bus and ac grid,   and to regulate the dc bus to a certain range of voltages.Adroop regulation   mechanism according to the inverter inductor current levels to reduce   capacitor size, balance power flow, and accommodate load variation is   proposed. Since the photovoltaic (PV) array voltage can vary from 0 to 600 V,   especially with thin-film PV panels, the MPPT topology is formed with buck   and boost converters to operate at the dc-bus voltage around 380 V, reducing   the voltage stress of its followed inverter. Additionally, the controller can   online check the input configuration of the two MPPTs, equally distribute the   PV-array output current to the twoMPPTs in parallel operation, and switch   control laws to smooth out mode transition. A comparison between the   conventional boostMPPT and the proposed buck/boostMPPT integrated with a PV   inverter is also presented. Experimental results obtained froma 5-kW system   have verified the discussion and feasibility. (Index   Terms—Bidirectional inverter, buck/boost maximum power point trackers   (MPPTs), dc-distribution applications.) IEEE   2013
PE49 Interleaved   Boundary Conduction Mode (BCM) Buck Power Factor Correction (PFC) Converter Abstract—An   interleaved boundary conduction mode powerfactor- correction buck converter   that maintains high efficiency across entire load and line range is proposed.   The adaptive master– slave interleaving method maintains stable 180◦ out-of-phase operation during any transient. By interleaving two   parallel-connected buck converters, the input current ripple is halved   while the ripple frequency is doubled, which leads to a smaller differential   mode line filter. The line current harmonic distortion is analyzed to examine   the allowable output voltage range while meeting harmonic regulations. The   operation and performance of the proposed circuit is verified on a 300 W,   universal line experimental prototype with 80 V output. The measured   efficiencies remain above 96% down to 20% of full load across the entire   universal line range. Even at 10% of full-load condition, the efficiency   remains above 94%. The input current harmonics also meet the IEC61000-3-2   (class D) standard. (Index   Terms—Boundary conduction mode (BCM), buck converter, interleaving, power   factor correction (PFC).) IEEE   2013
PE50 Light-Load   Efficiency Improvement in Buck-Derived Single-Stage Single-Switch PFC   Converters Abstract—Single-stage   single-switch ac/dc converters with power factor correction (PFC) generally   have higher power losses under a light-load condition, as compared to that of   the two-stage approach, due to the sharing of a common power transistor such   that the PFC stage cannot be switched OFF separately to save power losses.   This letter addresses this problem by using a buck topology for the PFC stage   of the single-stage single-switch converters as it can be completely turned   OFF by operating the converter only near the zero crossing of the input   voltage, due to the presence of the dead angle of input current. Hence, the   switching and conduction losses to the transistor and diodes, and passive   devices are reduced. Also, further improvement is made by finding the best   combination of dc-bus capacitor charging time and discharging time to achieve   the lowest power loss. A recently proposed converter topology which combines   a buck PFC cell with a buck–boost dc/dc cell is used as an example.   Experimental results are reported and confirmed that the proposed light-load   power loss reduction scheme on the converter can improve power stage   efficiency by up to 7% at 1 W of output power as compared to that without the   proposed scheme. (Index   Terms—Light-load efficiency, power consumption, Power factor correction,   single-stage.) IEEE   2013
PE51 Light-to-Light:   PV-Fed LED Lighting Systems Abstract—This   paper discusses the principle of operation, dynamic modeling, and control   design for light-to-light (LtL) systems, whose aim is to directly convert the   sun irradiation into artificial light. The system discussed in this paper is   composed by a photovoltaic (PV) panel, an LED array, a dc–dc converter   dedicated to the maximum power point tracking of the PV panel and a dc–dc   converter dedicated to drive the LEDs array. A system controller is also   included, whose goal is to ensure the matching between the maximum available   PV power and the LED power by means of a low-frequency LEDs dimming. An   experimental design example is discussed to illustrate the functionalities of   the LtL system. (Index   Terms—LED lighting, maximum power point tracking, PV systems.) IEEE   2013
PE52 Mitigation   of Lower Order Harmonics in a Grid-Connected Single-Phase PV Inverter Abstract—In   this paper, a simple single-phase grid-connected photovoltaic (PV) inverter   topology consisting of a boost section, a low-voltage single-phase inverter   with an inductive filter, and a step-up transformer interfacing the grid is   considered. Ideally, this topology will not inject any lower order harmonics   into the grid due to high-frequency pulse width modulation operation.   However, the nonideal factors in the system such as core saturation-induced   distorted magnetizing current of the transformer and the dead time of the   inverter, etc., contribute to a significant amount of lower order harmonics   in the grid current. A novel design of inverter current control that   mitigates lower order harmonics is presented in this paper. An adaptive   harmonic compensation technique and its design are proposed for the lower   order harmonic compensation. In addition, a proportional-resonant-integral   (PRI) controller and its design are also proposed. This controller eliminates   the dc component in the control system, which introduces even harmonics in   the grid current in the topology considered.The dynamics of the system due to   the interaction between the PRI controller and the adaptive compensation   scheme is also analyzed. The complete design has been validated with   experimental results and good agreement with theoretical analysis of the   overall system is observed. (Index   Terms—Adaptive filters, harmonic distortion, inverters, solar energy.) IEEE   2013
PE53 Modeling   and Simulation of All-Electric Ships With Low-Voltage DC Hybrid Power Systems Abstract—DChybrid   power systems are of interest for future low emission, fuel-efficient   vessels. In spite of the advantages they offer onboard a ship, they result in   a complex, interconnected system, which requires effective analysis tools to   enable a full realization of the advantages. Modeling and simulation are   essential tools to facilitate design, analysis, and optimization of the   system. This paper reviews modeling of hybrid electric ship components   including mechanical and electrical elements. Power electronic converters are   modeled by nonlinear averaging methods to suit system-level studies. A   unified model for bidirectional converters is proposed to avoid transitions   between two separate models. A simulation platform using the derived models   is developed for the system-level analysis of hybrid electric ships.   Simulation results of power sharing among two diesel generators, a fuel cell   module, and an energy storage system are presented for three modes of   operation. (Index   Terms—DC distribution systems, modeling, simulation, transportation.) IEEE   2013
PE54 Multilevel   DC-Link Inverter and Control Algorithm to Overcome the PV Partial Shading Abstract—This   letter presents for the first time the application of multilevel dc-link   inverter to overcome the problem of partial shading of individual   photovoltaic (PV) sources which are connected in series. The “PV permutation   algorithm,” as a new method, is developed for the control of the inverter so   as to extract the maximum power form each PV source under partial shading and   to deliver all that power to the load. The algorithm is based on combination   of the direct pulsewidth modulation, the sequential permutation PV sources,   and the output generation to control the multilevel dc-link inverter. The   algorithm is applied successfully to a seven-level inverter with separate   maximum power point tracking algorithm for each PV source and under   nonuniform irradiance (partial shading). Digital processing unit F28335 eZdsp   is used to control the PV system in the real-time mode, and MATLAB–Simulink   real-time data exchange is employed to display the extracted power and to   control the system parameters via a designed graphical user interface window.   The implementation and experimental results are presented. (Index   Terms—Maximum power point tracking (MPPT), multilevel inverter, photovoltaic   partial shading, real-time data exchange (RTDX).) IEEE   2013
PE55 Mutual   Impedance of Small Ring-Type Coils for Multiwinding Induction Heating   Appliances Abstract—This   paper proposes amodel of the mutual impedance between ring-type coils used in   domestic induction hobs. Recent developments in these appliances have focused   on flexible cooking surfaces, including adjustable-size or total-active   surfaces. Flexible cooking surfaces are implemented by means of several small   ring-type closely arranged coils, each one supplied by a resonant inverter.   The basic winding is a ring-type circular small coil, whose self-impedance   has been reported previously. In this paper, the coupling between coils in   terms of impedance is derived. The coils are modeled as axisymmetric current   density distributions with parallel revolution axes. The mutual impedance   between the coils is obtained considering two media representing the load and   the ferrite, respectively. Experimental measurements have been performed to   validate the results. (Index   Terms—Frequency-dependent impedance, home appliances, impedance matrix,   impedance measurements, induction heating, inductors, mutual coupling, mutual   impedance.) IEEE   2013
PE56 Nonlinear   Behavior and Instability in a Three-Phase Boost Rectifier Connected to a   Nonideal Power Grid With an Interacting Load Abstract—Three-phase   voltage source converters (VSCs) are commonly used to convert ac power from a   three-phase grid to a regulated dc voltage with unity input power factor. The   control of the VSC is normally achieved by an outer voltage feedback loop and   a sinusoidal pulsewidth-modulated inner current loop. However, the nonideal   power grid and the presence of other interacting loads give rise to nonlinear   operation and drive the VSC to enter an irreversible instability region. In   this paper, an irreversible bifurcation phenomenon in a three-phase VSC   connected to a power grid with an interacting load is reported. The converter   can also be regarded as exhibiting a catastrophic bifurcation in which the   input current expands to impose undesirable component stress. A large-signal   analysis is adopted to identify the physical origin of the phenomenon and to   locate the boundary of the instability. Experimental results on a 4-kVA ac/dc   converter prototype provide verification of the instability phenomenon. (Index   Terms—Bifurcation, instability, power grid, three-phase voltage source   converter (VSC).) IEEE   2013
PE57 Novel   Energy Conversion System Based on a Multimode Single-Leg Power Converter Abstract—This   paper presents a novel power conversion topology for systems, which include a   boost and bidirectional converters to control the power flows between   sources, batteries, and ultracapacitors. The proposed system (multimode   single-leg power converter) substitutes the boost converter and bidirectional   converter with a multifunctional bidirectional converter and has cost   effectiveness and fault tolerance, preserving the same energy conversion   functionalities of the conventional energy conversion system. To verify the   performance of the proposed system, its operations are categorized and   explained to four different modes. Then, each mode of the proposed system is   simulated and implemented experimentally using a prototype test bed. The   results present that the proposed conversion system is feasible and   applicable for a wide range of applications including alternative/renewable   power systems and electric vehicles (EVs).(Index   Terms—Bidirectional converter, energy conversion, hybrid vehicles, renewable   energy.) IEEE   2013
PE58 Origin   of Cross-Coupling Effects in Distributed DC–DC Converters in Photovoltaic   Applications Abstract—Long   strings of photovoltaic (PV) modules are found to be vulnerable to shading   effects, causing significant reduction in the system power output. To   overcome this, distributed maximum power point-tracking (DMPPT) schemes have   been proposed, in which individual dc–dc converters are connected to each PV   module to enable module-wise maximum power extraction. There are twomain   concepts to implementDMMPTsystems: series and parallel configuration, describing   the connection of the output terminals of the converters. Both systems are   studied intensively, with innovative solutions to encountered operational   challenges and novel control methods. However, a comprehensive dynamic model   for neither system has been presented so far. This paper fills the gap by   presenting small-signal models for both configurations, explaining the   observed operational peculiarities. The analytical claims are verified with a   practical system comprising two maximum power point-tracking buck–boost   converters. (Index   Terms—Cascaded converters, dc–dc power conversion, photovoltaic (PV) power   systems.) IEEE   2013
PE59 Perturbation   On-Time (POT) Technique in Power Factor Correction (PFC) Controller for Low   Total Harmonic Distortion and High Power Factor Abstract—The   proposed perturbation on-time technique suppresses total harmonic distortion   (THD) and, thus, improves the power factor in the power factor correction   (PFC) controller. Besides, the adaptive control of the minimum off time by   the proposed inhibit time control can improve efficiency even at lowac input   voltage. Therefore, highly integrated PFC converter fabricated in the TSMC   800-V ultrahigh voltage process can achieve low THD of 6%, high PF of 99%,   and high efficiency of 95% at the output power of 90W. (Index   Terms—Inhibit time (IT) control, nonnegative-voltage zero current detector   (NNV-ZCD), perturbation on time (POT), power factor correction (PFC),   ultrahigh voltage (UHV).) IEEE   2013
PE60 Precise   Accelerated Torque Control for Small Inductance Brushless DC Motor Abstract—In   this paper, precise accelerated torque control for a small inductance   brushless dc motor (BLDCM) is achieved by electromagnetic torque control and   disturbance torque suppression. First, the electromagnetic torque ripple is   reduced in commutation and conduction regions. In the former region, the   ripple is suppressed by overlapping commutation control and optimizing the   duty ratio of the active controller. In the latter region, the unbalance   ripple caused by the unbalanced three phase windings is reduced by the   proposed asymmetry compensation function, and the disturbance ripple created   by the back electromotive force (EMF) is compensated by feedforward control.   Second, the disturbance torque has been observed and compensated through the   improved disturbance torque controller whose compensation coefficient is   obtained by line-to-line back EMF coefficient estimation. And, both the   disturbance observation and speed measurement are all synchronized with the   encoder pulse alteration. Experimental results are presented to demonstrate   the validity and effectiveness of the proposed accelerated torque control   scheme. (Index   Terms—Accelerated torque, brushless dc motor (BLDCM), disturbance   suppression, electromagnetic torque, small inductance, torque ripple.) IEEE   2013
PE61 Problems   Incurred in a Vector-Controlled Single-Phase Induction Motor, and a Proposal   for a Vector-Controlled Two-Phase Induction Motor as a Replacement Abstract—This   paper presents several of the problems encountered with vector-controlled   single-phase induction motor (SPIM), and discusses about the complex   implementation of a vector controlled SPIM drive. The vector-controlled   symmetrical two-phase induction motor (TPIM) is presented as a viable replacement   for the vector-controlled SPIM. The implementation of the proposed   vector-controlled TPIM is simple compared to the vectorcontrolled SPIM. All   the TPIM parameters can be calculated simply and precisely. The proposed   strategy for TPIM is derived from the indirect vector control strategy used   for three-phase ac machines. Several differences between the vector control   strategies for the TPIM and for three-phase ac motor are discussed. The   validity of the proposed vector-controlled TPIM was verified by simulations   and experiments. (Index   Terms—Vector-controlled single-phase induction motor (SPIM),   vector-controlled two-phase induction motor (TPIM), unsymmetrical motor.) IEEE   2013
PE62 Reconfigurable   Solar Converter: A Single-Stage Power Conversion PV-Battery System Abstract—This   paper introduces a new converter called reconfigurable solar converter (RSC)   for photovoltaic (PV)-battery application, particularly utility-scale   PV-battery application. The main concept of the new converter is to use a   single-stage threephase grid-tie solar PV converter to perform dc/ac and   dc/dc operations. This converter solution is appealing for PV-battery   application, because itminimizes the number of conversion stages, thereby   improving efficiency and reducing cost, weight, and volume. In this paper, a   combination of analysis and experimental tests is used to demonstrate the   attractive performance characteristics of the proposed RSC. (Index   Terms—Converter, energy storage, photovoltaic (PV), solar.) IEEE   2013
PE63 Series   Asymmetrical Half-Bridge Converters With Voltage Autobalance for High   Input-Voltage Applications Abstract—In   this paper, an isolated series asymmetrical halfbridge converter (SA-HBC) is   proposed to satisfy the high power and high input-voltage requirements. In   the proposed converter, two half-bridge modules with series configuration are   adopted in the primary side to reduce the switch voltage stress to half of   the input voltage.Moreover, the series half-bridge cells share the same   transformer and leakage inductance, which simplifies the circuit structure.   Zero-voltage-switching transition is achieved for all the active switches by   employing the asymmetrical control scheme to reduce the switching losses.   Furthermore, the voltages of the input capacitors are automatically balanced   without any additional components or complex control methods. In addition, a   family of dc–dc converters with series half-bridge structure is explored to   give a universal discussion and extensive applications of the proposed   contributions for the high input-voltage systems. Finally, a 500–600-V input   48-V output 1-kW prototype operating with 100 kHz switching frequency is   built and tested to demonstrate the    effectiveness of the proposed SA-HBC converter. The efficiency of 95%   at full load is realized. (Index   Terms—High voltage applications and voltage autobalance ability, series   asymmetrical half-bridge converter (SA-HBC).) IEEE   2013
PE64 Soft-Switching   DC/DC Converter With a Full ZVS Range and Reduced Output Filter for   High-Voltage Applications Abstract—Anew   soft-switching dc/dc converter, which can solve the drawbacks of existing   phase-shifted full-bridge converters such as narrow zero-voltage-switching   (ZVS) range, large circulating current, large duty-cycle loss, and a large   output filter in highvoltage applications, is proposed in this paper. The   proposed converter is composed of two symmetric half-bridge inverters that   are placed in parallel on the primary side and are driven in a phase-shifting   manner to regulate the output voltage. At the rectifier stage, two   full-bridge rectifiers sharing two low-current-rating diodes are employed.   This structure allows the proposed converter to have the advantages of a full   ZVS range, no problems related to duty-cycle loss, no circulating current,   and a significantly reduced output filter. In this paper, the circuit   configuration, operation principle, and relevant analysis results of the   proposed converters are presented. Experimental results on a prototype   converter realized with the specification of 80-in plasma display panel   sustain power module (320–385 Vdc input, 205 Vdc /5 A output) validate the   theoretical analysis. (Index   Terms—No circulating current, no duty-cycle loss, phaseshift, zero-voltage   switching (ZVS).) IEEE   2013
PE65 Space-Vector-Modulated   Three-Level Inverters With a Single Z-Source Network Abstract—The   Z-source inverter is a relatively recent converter topology that exhibits   both voltage-buck and voltage-boost capability. The Z-source concept can be   applied to all dc-to-ac, acto- dc, ac-to-ac, and dc-to-dc power conversion   whether two-level  or multilevel.   However, multilevel converters offer many benefits for higher power   applications. Previous publications have shown the control of a Z-source   neutral point clamped inverter using the carrier-based modulation technique.   This paper presents the control of a Z-source neutral point clamped inverter   using the space vector modulation technique. This gives a number of benefits,   both in terms of implementation and harmonic performance. The adopted   approach enables the operation of the Z-source arrangement to be optimized   and implemented digitally without introducing any extra commutations. The   proposed techniques are demonstrated both in simulation and through   experimental results from a prototype converter. (IndexTerms—Buck–boost,   neutral point clamped inverter, space vector modulation (SVM), Z-source   inverter.) IEEE   2013
PE66 Synchronous-Reference-Frame-Based   Control of Switched Boost Inverter for Standalone DC Nanogrid Applications Abstract—Switched   boost inverter (SBI) is a single-stage power converter derived from Inverse   Watkins Johnson topology. Unlike the traditional buck-type voltage source   inverter (VSI), the SBI can produce an ac output voltage that is either   greater or less than the available dc input voltage. Also, the SBI exhibits   better electromagnetic interference noise immunity when compared to the VSI,   which enables compact design of the power converter. Another advantage of SBI   is that it can supply both dc and ac loads simultaneously from a single dc   input. These features make the SBI suitable for dc nanogrid applications. In   this paper, the SBI is proposed as a power electronic interface in dc   nanogrid. The structure and advantages of the proposed SBI-based nanogrid are   discussed in detail. This paper also presents a dq synchronousreference-   frame-based controller for SBI, which regulates both dc and ac bus voltages   of the nanogrid to their respective reference values under steady state as   well as under dynamic load variation in the nanogrid. The control system of   SBI has been experimentally validated using a 0.5-kW laboratory prototype of   the SBI supplying both dc and ac loads simultaneously, and the relevant   experimental results are given in this paper. The low cross regulation and   the dynamic performance of the control system have also been verified   experimentally for a 20% step change in either dc or ac load of SBI. These   experimental results confirm the suitability of the SBI and its closed-loop   control strategy for dc nanogrid applications. (Index   Terms—DC nanogrid, switched boost inverter (SBI), synchronous reference frame   (SRF) control.) IEEE   2013
PE67 Synthesizable   Integrated Circuit and System Design for Solar Chargers Abstract—In   this paper, an automatic design tool for a solar energy harvesting IC and   system is developed with visual basic software, and the synthesis tool   employed in this approach can be used to shorten the design time to market.   In addition, a smart meter system is developed to measure the solar energy   harvesting system’s information with an online system. Users can thus get the   proposed system’s information at any time and from anywhere. Finally, good   agreement has been found between the analytic and experimental results. (Index   Terms—Digital-to-analog converter (DAC), energy harvesting, pulsewidth   modulation (PWM).) IEEE   2013
PE68 The   TAIPEI Rectifier—A New Three-Phase Two-Switch ZVS PFC DCM Boost Rectifier Abstract—A   new, three-phase, two-switch, power-factorcorrection (PFC) rectifier that can   achieve less than 5% inputcurrent total harmonic distortion (THD) and   features zero-voltage switching (ZVS) of all the switches over the entire   input-voltage and load ranges is introduced. The proposed rectifier also   offers automatic voltage balancing across the two output capacitors connected   in series,whichmakes it possible to use downstreamconverters designed with   lower voltage-rated component that offer better performance and are less   expensive than their high-voltage-rated counterparts. In addition, the   proposed rectifier also exhibits low common-mode EMI noise. The performance   of the proposed rectifier was evaluated on a 2.8-kW prototype with a 780-V   output that was designed to operate in 340–520-VL-L,RMS input-voltage range. (Index   Terms—Boost converter, discontinuous conduction mode, power factor   correction, three phase, voltage balancing, zerovoltage switching.) IEEE   2013
PE69 Triple Loop   Modulation (TLM) for High Reliability and Efficiency in a Power Factor   Correction (PFC) System Abstract—The   proposed triple loop modulation (TLM) can ensure reliability of the power   factor correction (PFC) system due to the improvement of transient response.   In conventional design, low bandwidth of less than 20Hz that rejects ac   source of 60/120 Hz coupling deteriorates system reliability in case of   output load variation. Contrarily, the proposedTLMcan automatically adjust   bandwidth to rapidly increase or decrease inductor current to shorten   transient response time. Besides, in the steady state, system stability can   be guaranteed by low-frequency compensation pole without being affected by   the TLM. The test circuit fabricated in a VIS 500 V UHV laterally diffused   metal–oxide–semiconductor transistor process demonstrates that the highly   integrated PFC controller with the proposed TLM has high power factor of 99%,   high efficiency of 95%, and high power driving capability of about 90 W. The   improvement in transient response is twofold faster than in conventional PFC   design with output load variation from 90 to 20W and vice versa. (Index   Terms—Fast transient response, power factor correction (PFC), triple loop   modulation (TLM).) IEEE   2013
PE70 Unterminated   Small-Signal Behavioral Model of DC–DC Converters Abstract—The   “black-box” modeling of dc–dc converters has always been an attractive topic   widely used in engineering practice. However, in order to obtain unterminated   model of dc–dc converter, the one had to be removed from the original   environment and connected to the high-bandwidth voltage source and current   sink for easier decoupling of the source and the load dynamics. This paper   addresses an online dc–dc converter characterization procedurewhere converter   under test can remainworking in the original environment, at the particular   operating point, and be connected to any type of the source and the load   while the terminated frequency response characteristics are obtained. The   source and the load dynamics can then be decoupled from the measured frequency   responses using here proposed linear transformation matrix. The verification   and validation of the proposed technique will be both presented in this   paper. (Index   Terms—Behavioral model, dc power systems, decoupling, electronic power   converters, un-terminated transfer functions.) IEEE   2013
PE71 Γ-Z-Source   Inverters Abstract—Voltage-type   Γ-Z-source inverters are proposed in this letter. They use a unique Γ-shaped   impedance network for boosting their output voltage in addition to their   usual voltagebuck behavior. Comparing them with other topologies, the   proposed inverters use lesser components and a coupled transformer for   producing the high-gain and modulation ratio simultaneously. The obtained   gain can be tuned by varying the turns ratio γΓZ of the transformer within   the narrow range of 1 < γΓZ ≤ 2. This leads to lesser winding turns at   high gain, as compared to other related topologies. Experimental testing has   already proven the validity of the proposed inverters. (Index   Terms—Embedded-Z-source, quasi-Z-source, T-source, trans-Z-source, Z-source,   Γ-Z-source inverters.) IEEE   2013