Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 14, Issue 6 - Nov 2014
Volume 14, Issue 5 - Sep 2014
Volume 14, Issue 4 - Jul 2014
Volume 14, Issue 3 - May 2014
Volume 14, Issue 2 - Mar 2014
Volume 14, Issue 1 - Jan 2014
Selecting the target year
A Study on Implementing a Phase-Shift Full-Bridge Converter Employing an Asynchronous Active Clamp Circuit
Lee, Yong-Chul ; Kim, Hong-Kwon ; Kim, Jin-Ho ; Hong, Sung-Soo ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 413~420
DOI : 10.6113/JPE.2014.14.3.413
The conventional Phase-Shift Full-Bridge (PSFB) converter has a serious voltage spike because of the ringing between the leakage inductance of the transformer and the parasitic output capacitance of the secondary side rectifier switches. To overcome this problem, an asynchronous active clamp technique employing an auxiliary DC/DC converter has been proposed. However, an exact analyses for designing the auxiliary DC/DC converter has not been presented. Therefore, the amount of power that is supposed to be handled in the auxiliary DC/DC converter is calculated through a precise mode analyses in this paper. In addition, this paper proposes a lossy snubber circuit with hysteresis characteristics to reduce the burden that the auxiliary DC/DC converter should take during the starting interval. This technique results in optimizing the size of the magnetic component of the auxiliary DC/DC converter. The operational principles and the theoretical analyses are validated through experiments with a 48V-to-30V/15A prototype.
Digital Control of Secondary Active Clamp Phase-Shifted Full-Bridge Converters
Che, Yanbo ; Ma, Yage ; Ge, Shaoyun ; Zhu, Dong ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 421~431
DOI : 10.6113/JPE.2014.14.3.421
A DSP-based self-adaptive proportional-integral (PI) controller to control a DC-DC converter is proposed in this paper. The full-bridge topology is adopted here to obtain higher power output capability and higher conversion efficiency. The converter adopts the zero-voltage-switching (ZVS) technique to reduce the conduction losses. A parallel secondary active clamp circuit is added to deal with the voltage overshoot and ringing effect on the transformer's secondary side. A self-adaptive PI controller is proposed to replace the traditional PI controller. Moreover, the designed converter adopts the constant-current and constant-voltage (CC-CV) output control strategy. The secondary active clamp mechanism is discussed in detail. The effectiveness of the proposed converter was experimentally verified by an IGBT-based 10kW prototype.
Research on High Efficiency Non-Isolated Push-Pull Converters with Continuous Current in Solar-Battery Systems
Li, Yan ; Zheng, Trillion Q. ; Chen, Qian ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 432~443
DOI : 10.6113/JPE.2014.14.3.432
In order to improve the output efficiency of solar cells and to extend the life span of batteries, the input currents of converters are required to be continuous. If low output voltage ripple is required at the same time, it is obvious that the application of basic two-order converters (such as Buck and Boost derived converters) will not be good enough. In this paper, a lot of non-isolated push-pull converters (NIPPCs) with continuous current will be introduced due to their lower current stress, higher efficiency and better EMC performance. By decomposing the converters into push-pull cells, inductor and free-wheeling diodes, two families of NIPPCs based on single inductor and coupled inductor separately are systematically generated. Furthermore, characteristics analyses for some of the generated converters are also shown in this paper. Finally, two prototypes based on the corresponding typical topologies are built in the lab to verify the theoretical outcomes.
Design and Realization of a Digital PV Simulator with a Push-Pull Forward Circuit
Zhang, Jike ; Wang, Shengtie ; Wang, Zhihe ; Tian, Lixin ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 444~457
DOI : 10.6113/JPE.2014.14.3.444
This paper presents the design and realization of a digital PV simulator with a Push-Pull Forward (PPF) circuit based on the principle of modular hardware and configurable software. A PPF circuit is chosen as the main circuit to restrain the magnetic biasing of the core for a DC-DC converter and to reduce the spike of the turn-off voltage across every switch. Control and I/O interface based on a personal computer (PC) and multifunction data acquisition card, can conveniently achieve the data acquisition and configuration of the control algorithm and interface due to the abundant software resources of computers. In addition, the control program developed in Matlab/Simulink can conveniently construct and adjust both the models and parameters. It can also run in real-time under the external mode of Simulink by loading the modules of the Real-Time Windows Target. The mathematic models of the Push-Pull Forward circuit and the digital PV simulator are established in this paper by the state-space averaging method. The pole-zero cancellation technique is employed and then its controller parameters are systematically designed based on the performance analysis of the root loci of the closed current loop with
as variables. A fuzzy PI controller based on the Takagi-Sugeno fuzzy model is applied to regulate the controller parameters self-adaptively according to the change of
and the operating point of the PV simulator to match the controller parameters with
. The stationary and dynamic performances of the PV simulator are tested by experiments, and the experimental results show that the PV simulator has the merits of a wide effective working range, high steady-state accuracy and good dynamic performances.
A Single-Phase Current-Source Bidirectional Converter for V2G Applications
Han, Hua ; Liu, Yonglu ; Sun, Yao ; Wang, Hui ; Su, Mei ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 458~467
DOI : 10.6113/JPE.2014.14.3.458
In this paper, a single-phase current-source bidirectional converter topology for V2G applications is proposed. The proposed converter consists of a single-phase current-source rectifier (SCSR) and an auxiliary switching network (ASN). It offers bidirectional power flow between the battery and the grid in the buck or boost mode and expands the output voltage range, so that it can be compatible with different voltage levels. The topology structure and operating principles of the proposed converter are analyzed in detail. An indirect control algorithm is used to realize the charging and discharging of the battery. Finally, the semiconductor losses and system efficiency are analyzed. Simulation and experimental results demonstrate the validity and effectiveness of the proposed topology.
Optimized Design of Bi-Directional Dual Active Bridge Converter for Low-Voltage Battery Charger
Jeong, Dong-Keun ; Ryu, Myung-Hyo ; Kim, Heung-Geun ; Kim, Hee-Je ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 468~477
DOI : 10.6113/JPE.2014.14.3.468
This study proposes an optimized design of a dual active bridge converter for a low-voltage charger in a military uninterrupted power supply (UPS) system. The dual active bridge converter is among various bi-directional DC/DC converters that possess a high-efficiency isolated bi-directional converter. In the general design, the zero-voltage switching(ZVS) region is reduced when the battery voltage is high. By contrast, efficiency is low because of high conduction losses when the battery voltage is low. Variable switching frequency is applied to increase the ZVS region and the power conversion efficiency, depending on battery voltage changes. At the same duty, the same power is obtained regardless of the battery voltage using the variable switching frequency. The proposed method is applied to a 5 kW prototype dual active bridge converter, and the experimental results are analyzed and verified.
Analysis and Implementation of a New Three-Level Converter
Lin, Bor-Ren ; Nian, Yu-Bin ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 478~487
DOI : 10.6113/JPE.2014.14.3.478
This study presents a new interleaved three-level zero-voltage switching (ZVS) converter for high-voltage and high-current applications. Two circuit cells are operated with interleaved pulse-width modulation in the proposed converter to reduce the current ripple at the input and output sides, as well as to decrease the current rating of output inductors for high-load-current applications. Each circuit cell includes one half-bridge converter and one three-level converter at the primary side. At the secondary side, the transformer windings of two converters are connected in series to reduce the size of the output inductor or switching current in the output capacitor. Based on the three-level circuit topology, the voltage stress of power switches is clamped at
. Thus, MOSFETs with 500 V voltage rating can be used at 800 V input voltage converters. The output capacitance of the power switch and the leakage inductance (or external inductance) are resonant at the transition interval. Therefore, power switches can be turned on under ZVS. Finally, experiments verify the effectiveness of the proposed converter.
Selective Harmonic Elimination for a Single-Phase 13-level TCHB Based Cascaded Multilevel Inverter Using FPGA
Halim, Wahidah Abd. ; Rahim, Nasrudin Abd. ; Azri, Maaspaliza ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 488~498
DOI : 10.6113/JPE.2014.14.3.488
This paper presents an implementation of selective harmonic elimination (SHE) modulation for a single-phase 13-level transistor-clamped H-bridge (TCHB) based cascaded multilevel inverter. To determine the optimum switching angle of the SHE equations, the Newton-Raphson method is used in solving the transcendental equation describing the fundamental and harmonic components. The proposed SHE scheme used the relationship between the angles and a sinusoidal reference waveform based on voltage-angle equal criteria. The proposed SHE scheme is evaluated through simulation and experimental results. The digital modulator based-SHE scheme using a field-programmable gate array (FPGA) is described and has been implemented on an Altera DE2 board. The proposed SHE is efficient in eliminating the
order harmonics, which validates the analytical results. From the results, it can be seen that the adopted 13-level inverter produces a higher quality with a better harmonic profile and sinusoidal shape of the stepped output waveform.
Bi-Directional Multi-Level Converter for an Energy Storage System
Han, Sang-Hyup ; Kim, Heung-Geun ; Cha, Honnyong ; Chun, Tae-Won ; Nho, Eui-Cheol ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 499~506
DOI : 10.6113/JPE.2014.14.3.499
This paper proposes a 3 kW single-phase bi-directional multi-level converter for energy storage applications. The proposed topology is based on the H-bridge structure with four switches connected to the DC-link. A simple phase opposition disposition PWM method that requires only one carrier signal is also suggested. The switching sequence to balance the capacitor voltage is considered. The topology can be extended to a nine-level converter or a three-phase system. The operating principle of the proposed converter is verified through a simulation and an experiment.
Experimental Validation of a Cascaded Single Phase H-Bridge Inverter with a Simplified Switching Algorithm
Mylsamy, Kaliamoorthy ; Vairamani, Rajasekaran ; Irudayaraj, Gerald Christopher Raj ; Lawrence, Hubert Tony Raj ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 507~518
DOI : 10.6113/JPE.2014.14.3.507
This paper presents a new cascaded asymmetrical single phase multilevel converter with a lower number of power semiconductor switches and isolated DC sources. Therefore, the number of power electronic devices, converter losses, size, and cost are reduced. The proposed multilevel converter topology consists of two H-bridges connected in cascaded configuration. One H-bridge operates at a high frequency (high frequency inverter) and is capable of developing a two level output while the other H-bridge operates at the fundamental frequency (low frequency inverter) and is capable of developing a multilevel output. The addition of each power electronic switch to the low frequency inverter increases the number of levels by four. This paper also introduces a hybrid switching algorithm which uses very simple arithmetic and logical operations. The simplified hybrid switching algorithm is generalized for any number of levels. The proposed simplified switching algorithm is developed using a TMS320F2812 DSP board. The operation and performance of the proposed multilevel converter are verified by simulations using MATLAB/SIMULINK and experimental results.
Simplified PWM Strategy for Neutral-Point-Clamped (NPC) Three-Level Converter
Ye, Zongbin ; Xu, Yiming ; Li, Fei ; Deng, Xianming ; Zhang, Yuanzheng ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 519~530
DOI : 10.6113/JPE.2014.14.3.519
A novel simplified pulse width modulation(PWM) strategy for neutral point clamped (NPC) three-level converter is proposed in this paper.The direct output voltage modulation is applied to reduce the calculation time. Based on this strategy, several optimized control methods are proposed. The neutral point potential balancing algorithm is discussed and a fine neutral point potential balancing scheme is introduced. Moreover, the minimum pulse width compensation and switching losses reduction can be easily achieved using this modulation strategy. This strategy also gains good results even with the unequal DC link capacitor. The modulation principle is studied in detail and the validity of this simplified PWM strategy is experimentally verified in this paper. The experiment results indicated that the proposed PWM strategy has excellent performance, and the neutral point potential can be balanced well with unequal DC link captaincies.
Novel Carrier-Based PWM Strategy of a Three-Level NPC Voltage Source Converter without Low-Frequency Voltage Oscillation in the Neutral Point
Li, Ning ; Wang, Yue ; Lei, Wanjun ; Niu, Ruigen ; Wang, Zhao'an ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 531~540
DOI : 10.6113/JPE.2014.14.3.531
A novel carrier-based PWM (CBPWM) strategy of a three-level NPC converter is proposed in this paper. The novel strategy can eliminate the low-frequency neutral point (NP) voltage oscillation under the entire modulation index and full power factor. The basic principle of the novel strategy is introduced. The internal modulation wave relationship between the novel CBPWM strategy and traditional SPWM strategy is also studied. All 64 modulation wave solutions of the CBPWM strategy are derived. Furthermore, the proposed CBPWM strategy is compared with traditional SPWM strategy regarding the output phase voltage THD characteristics, DC voltage utilization ratio, and device switching losses. Comparison results show that the proposed strategy does not cause NP voltage oscillation. As a result, no low-frequency harmonics occur on output line-to-line voltage and phase current. The novel strategy also has higher DC voltage utilization ratio (15.47% higher than that of SPWM strategy), whereas it causes larger device switching losses (4/3 times of SPWM strategy). The effectiveness of the proposed modulation strategy is verified by simulation and experiment results.
Simple Lead Angle Adjustment Method for Brushless DC Motors
Gu, Bon-Gwan ; Choi, Jun-Hyuk ; Jung, In-Soung ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 541~548
DOI : 10.6113/JPE.2014.14.3.541
This paper presents a simple lead angle adjustment method for brushless DC motors. The proposed method is based on the motor current dynamics analysis during the current commutation interval. With the proposed scheme, the phase current and phase back-EMF voltage are in phase and the BLDC motor and drive system have a high efficiency induced by the reduced copper and conduction losses. Experimental results are shown to validate the proposed method.
Speed Control for a PMSM Servo System Using Model Reference Adaptive Control and an Extended State Observer
Li, Xiaodi ; Li, Shihua ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 549~563
DOI : 10.6113/JPE.2014.14.3.549
In this paper, the speed regulation problem of permanent synchronous motor (PMSM) systems under the vector control framework is studied. A model reference adaptive controller (MRAC) based on the Lyapunov stability theory is first designed. Since the standard MRAC method provides poor disturbance rejection performance in the case of strong disturbances, a composite control method which combines the MRAC method and the disturbance estimation method, called the MRAC+ESO method, is proposed. An extended state observer (ESO) is introduced to estimate the lumped disturbances. The obtained estimated value acts as a feedforward compensation term to the MRAC controller. A stability analysis of the composite control method is given. Simulation and experimental results are presented and compared to show the effectiveness of the proposed control method.
Rotor Initial Position Estimation Based on sDFT for Electrically Excited Synchronous Motors
Yuan, Qing-Qing ; Wu, Xiao-Jie ; Dai, Peng ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 564~571
DOI : 10.6113/JPE.2014.14.3.564
Rotor initial position is an important factor affecting the control performance of electrically excited synchronous motors. This study presents a novel method for estimating rotor initial position based on sliding discrete Fourier transform (sDFT). By injecting an ac excitation into the rotor winding, an induced voltage is generated in stator windings. Through this voltage, the stator flux can be obtained using a pure integral voltage model. Considering the influence from a dc bias and an integral initial value, we adopt the sDFT to extract the fundamental flux component. A quadrant identification model is designed to realize the accurate estimation of the rotor initial position. The sDFT and high-pass filter, DFT, are compared in detail, and the contrast between dc excitation and ac injection is determined. Simulation and experimental results verify that this type of novel method can eliminate the influence of dc bias and other adverse factors, as well as provide a basis for the control of motor drives.
Steady-State Harmonic Domain Matrix-Based Modeling of Four-Quadrant EMU Line Converter
Wang, Hui ; Wu, Mingli ; Agelidis, Vassilios G. ; Song, Kejian ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 572~579
DOI : 10.6113/JPE.2014.14.3.572
As a non-linear time variant system, the four-quadrant line converter of an electric multiple unit (EMU) was expressed by linear time periodic functions near an operating point and modeled by a steady-state harmonic domain matrix. The components were then combined according to the circuit connection and relations of the feedback control loops to form a complete converter model. The proposed modeling method allows the study of the amplitude of harmonic impedances to explore harmonic coupling. Moreover, the proposed method helps provide a better design for the converter controllers, as well as solves the problem in coordination operation between the EMUs and the AC supply. On-site data from an actual
high-speed train were used to validate the modeling principles presented in the paper.
On the Use of a Dimmer for a Robust Frequency Control of a Self-Excited Three-Phase Induction Wind Generator
Touti, Ezzeddine ; Pusca, Remus ; Manata, Jean-Paul ; Brudny, Jean Francois ; Chaari, Abdelkader ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 580~591
DOI : 10.6113/JPE.2014.14.3.580
This paper concerns a three-phase self-excited induction generator used for autonomous power generation. It presents a robust control strategy which makes it possible to maintain the frequency quasi constant during the voltage regulation without any control loop on this variable. This strategy, which also prevents the machine disengagement, uses as power converter a simple dimmer. The obtained theoretical and/or numerical results are validated on a laboratory test bench that allows the analysis of this control law effectiveness.
A New AC/DC Converter for the Interconnections between Wind Farms and HVDC Transmission Lines
Nouri, Soheil ; Babaei, Ebrahim ; Hosseini, Seyyed Hossein ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 592~597
DOI : 10.6113/JPE.2014.14.3.592
In this paper, a new ac/dc converter is proposed for HVDC-connected wind farms. The proposed converter provides a suitable dc voltage for HVDC transmission systems. Each wind turbine is connected to two full bridge diode rectifiers. These rectifiers are connected to each other by three thyristors. Firing the thyristors at desired angles provides an adjustable dc voltage in the output of the converter. Simulation results show the efficiency of the proposed converter.
Advanced SOGI-FLL Scheme Based on Fuzzy Logic for Single-Phase Grid-Connected Converters
Park, Jin-Sang ; Nguyen, Thanh Hai ; Lee, Dong-Choon ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 598~607
DOI : 10.6113/JPE.2014.14.3.598
This paper proposes a frequency-locked loop (FLL) scheme for a single-phase grid-connected converter. A second-order generalized integrator (SOGI) based on fuzzy logic (FL) is applied to this converter to achieve precise phase angle detection. The use of this method enables the compensation of the nonlinear characteristic of the frequency error, which is defined in the SOGI scheme as the variation of the central frequency through the self-tuning gain. With the proposed scheme, the performance of the SOGI-FLL is further improved at the grid disturbances, which results in the stable operation of the grid converter under grid voltage sags or frequency variation. The PSIM simulation and experimental results are shown to verify the effectiveness of the proposed method.
Adaptive Neural PLL for Grid-connected DFIG Synchronization
Bechouche, Ali ; Abdeslam, Djaffar Ould ; Otmane-Cherif, Tahar ; Seddiki, Hamid ;
Journal of Power Electronics, volume 14, issue 3, 2014, Pages 608~620
DOI : 10.6113/JPE.2014.14.3.608
In this paper, an adaptive neural phase-locked loop (AN-PLL) based on adaptive linear neuron is proposed for grid-connected doubly fed induction generator (DFIG) synchronization. The proposed AN-PLL architecture comprises three stages, namely, the frequency of polluted and distorted grid voltages is tracked online; the grid voltages are filtered, and the voltage vector amplitude is detected; the phase angle is estimated. First, the AN-PLL architecture is implemented and applied to a real three-phase power supply. Thereafter, the performances and robustness of the new AN-PLL under voltage sag and two-phase faults are compared with those of conventional PLL. Finally, an application of the suggested AN-PLL in the grid-connected DFIG-decoupled control strategy is conducted. Experimental results prove the good performances of the new AN-PLL in grid-connected DFIG synchronization.