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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 12, Issue 6 - Nov 2012
Volume 12, Issue 5 - Sep 2012
Volume 12, Issue 4 - Jul 2012
Volume 12, Issue 3 - May 2012
Volume 12, Issue 2 - Mar 2012
Volume 12, Issue 1 - Jan 2012
Selecting the target year
Effects of Imperfect Sinusoidal Input Currents on the Performance of a Boost PFC Pre-Regulator
Cheung, Martin K.H. ; Chow, Martin H.L. ; Lai, Y.M. ; Loo, K.H. ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 689~698
DOI : 10.6113/JPE.2012.12.5.689
This paper investigates the effects of applying different input current waveshapes on the performance of a continuous-conduction-mode (CCM) power-factor-correction (PFC) boost pre-regulator. It is found that the output voltage ripple of the pre-regulator can be reduced if the input current is modified to include controlled amount of higher order harmonics. This finding allows us to balance the performance of output regulation and the harmonic current emission when coming to the design of the pre-regulator. An experimental PFC boost pre-regulator prototype is constructed to verify the analysis and show the benefit of the pre-regulator operating with input current containing higher order harmonics.
Single-Stage Half-Bridge Electronic Ballast Using a Single Coupled Inductor
Cho, Yong-Won ; Kwon, Bong-Hwan ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 699~707
DOI : 10.6113/JPE.2012.12.5.699
This paper proposes a single-stage half-bridge electronic ballast with a high power factor using only a single coupled inductor. Compared to conventional high power factor electronic ballasts, the proposed ballast is a simpler circuit with a low cost and a high reliability. The proposed ballast is made up of a power-factor-correction (PFC) circuit and a self-oscillating class-D inverter. The PFC and inverter stages of the proposed ballast are simplified by sharing only a single coupled inductor and two common switches. The proposed PFC circuit can achieve a high power factor and low voltage stresses of the switches. A saturable transformer in the self-oscillating class-D inverter determines the switching frequency of the ballast. Experimental results obtained on a 30W fluorescent lamp are discussed.
Interleaved Boost-Flyback Converter with Boundary Conduction Mode for Power Factor Correction
Lin, Bor-Ren ; Chien, Chih-Cheng ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 708~714
DOI : 10.6113/JPE.2012.12.5.708
This paper presents a new interleaved pulse-width modulation (PWM) boost-flyback converter to achieve power factor correction (PFC) and regulate DC bus voltage. The adopted boost-flyback converter has a high voltage conversion ratio to overcome the limit of conventional boost or buck-boost converter with narrow turn-off period. The proposed converter has wide turn-off period compared with a conventional boost converter. Thus, the higher output voltage can be achieved in the proposed converter. The interleaved PWM can further reduce the input and output ripple currents such that the sizes of inductor and capacitor are reduced. Since boundary conduction mode (BCM) is adopted to achieve power factor correction, power switches are turned on at zero current switching (ZCS) and switching losses are reduced. The circuit configuration, principle operation, system analysis, and design consideration of the proposed converter are presented in detail. Finally, experiments conducted on a laboratory prototype rated at 500W were presented to verify the effectiveness of the converter.
Time-Delay Effects on DC Characteristics of Peak Current Controlled Power LED Drivers
Jung, Young-Seok ; Kim, Marn-Go ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 715~722
DOI : 10.6113/JPE.2012.12.5.715
New discrete time domain models for the peak current controlled (PCC) power LED drivers in continuous conduction mode include for the first time the effects of the time delay in the pulse-width-modulator. Realistic amounts of time delay are found to have significant effects on the average output LED current and on the critical inductor value at the boundary between the two conduction modes. Especially, the time delay can provide an accurate LED current for the PCC buck converter with a wide input voltage. The models can also predict the critical inductor value at the mode boundary as functions of the input voltage and the time delay. The overshoot of the peak inductor current due to the time delay results in the increase of the average output current and the reduction of the critical inductor value at the mode boundary in all converters. Experimental results are presented for the PCC buck LED driver with constant-frequency controller.
A New Zero-Voltage-Switching Bridgeless PFC, Using an Active Clamp
Ramezani, Mehdi ; Ghasedian, Ehsan ; Madani, Seyed M. ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 723~730
DOI : 10.6113/JPE.2012.12.5.723
This paper presents a new ZVS single phase bridgeless (Power Factor Correction) PFC, using an active clamp to achieve zero-voltage-switching for all main switches and diodes. Since the presented PFC uses a bridgeless rectifier, most of the time, only two semiconductor components are in the main current path, instead of three in conventional single-switch configurations. This property significantly reduces the conduction losses,. Moreover, zero voltage switching removes switching loss of all main switches and diodes. Also, auxiliary switch turns on zero current condition. The presented converter needs just a simple non-isolated gate drive circuitry to drive all switches. The eight stages of each switching period and the design considerations and a control strategy are explained. Finally, the converter operation is verified by simulation and experimental results.
Novel Dummy Load for 40W Fluorescent Lamps
Choi, Bo-Hwan ; Kim, Hyun-Jae ; Yeo, In-Yong ; Kim, Bong-Cheol ; Rim, Chun-Taek ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 731~738
DOI : 10.6113/JPE.2012.12.5.731
A new fluorescent dummy load to replace one of the fluorescent lamps in a dual lamp type rapid-start ballast for halving the lamp power is proposed. Using a circuit composed of a fundamental compensation circuit and a harmonic filter circuit, a new fluorescent dummy load having superior characteristics than a conventional dummy load is developed. The design principle and architecture of the proposed fluorescent dummy load is explained and verified by experiments.
Leg-Balancing Control of the DC-link Voltage for Modular Multilevel Converters
Du, Sixing ; Liu, Jinjun ; Lin, Jiliang ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 739~747
DOI : 10.6113/JPE.2012.12.5.739
This paper applies carrier phase shifted pulse-width modulation (CPS-PWM) to transformerless modular multilevel converters (MMC) to improve the output spectrum. Because the MMC topology is characterized by the double-star connection of six legs consisting of cascaded modular chopper cells with floating capacitors, the balance control of the DC-link capacitor voltage is essential for safe operation. This paper presents a leg-balancing control strategy to achieve DC-link voltage balance under all operating conditions. This strategy based on circulating current decoupling control focused on DC-link balancing between the upper and lower legs in each phase pair by considering the six legs as three independent phase-pairs. Experiments are implemented on a 100-V 3-kVA downscaled prototype. The experimental results show that the proposed leg-balancing control is both effective and practical.
Analysis of Estimation Errors in Rotor Position for a Sensorless Control System Using a PMSM
Park, Yong-Soon ; Sul, Seung-Ki ; Ji, Jun-Keun ; Park, Young-Jae ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 748~757
DOI : 10.6113/JPE.2012.12.5.748
In a sensorless control system with a Permanent Magnet Synchronous Motor (PMSM), the angular position of the rotor flux can be estimated by a voltage equation. However, the estimated angle may be inaccurate due to various causes. In this paper, it was comprehensively analyzed how various causes affect the angle error. As a result of the analysis, an error equation intuitively describing these relationships was derived. The parameter errors of a PMSM and the non-ideal properties of the driving system were identified as error-causing factors. To demonstrate the validity of the error equation, PMSMs were tested at various operating points. The variations in angle errors could be well explained with the error equation.
Modeling and Position-Sensorless Control of a Dual-Airgap Axial Flux Permanent Magnet Machine for Flywheel Energy Storage Systems
Nguyen, Trong Duy ; Beng, Gilbert Foo Hock ; Tseng, King-Jet ; Vilathgamuwa, Don Mahinda ; Zhang, Xinan ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 758~768
DOI : 10.6113/JPE.2012.12.5.758
This paper presents the modeling and position-sensorless vector control of a dual-airgap axial flux permanent magnet (AFPM) machine optimized for use in flywheel energy storage system (FESS) applications. The proposed AFPM machine has two sets of three-phase stator windings but requires only a single power converter to control both the electromagnetic torque and the axial levitation force. The proper controllability of the latter is crucial as it can be utilized to minimize the vertical bearing stress to improve the efficiency of the FESS. The method for controlling both the speed and axial displacement of the machine is discussed. An inherent speed sensorless observer is also proposed for speed estimation. The proposed observer eliminates the rotary encoder, which in turn reduces the overall weight and cost of the system while improving its reliability. The effectiveness of the proposed control scheme has been verified by simulations and experiments on a prototype machine.
Minimum Time Regulation of DC-DC Converters in Damping Mode with an Optimal Adjusted Sliding Mode Controller
Jafarian, Mohammad Javad ; Nazarzadeh, Jalal ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 769~777
DOI : 10.6113/JPE.2012.12.5.769
In this paper, a new development in the time optimal control theory in sliding mode control systems for multi-quadrant buck converters with a variable load is presented. In general, the closed-loop time optimal control system is applied to multi-quadrant buck converters for output regulation, so that an optimal switching surface is obtained. Moreover, an adjusted optimal sliding mode controller is suggested which adjusts the controller parameters to give an optimal switching surface. In addition, a description of the transient response of the closed-loop system is proposed and used to damp any output or input disturbances in minimum time. Numerical simulations and experimental results are employed to demonstrate that the output regulation time and transient performances of dc/dc converters using the proposed technique are improved effectively when compared to the classical sliding mode control method.
Condition Monitoring of Lithium Polymer Batteries Based on a Sigma-Point Kalman Filter
Seo, Bo-Hwan ; Nguyen, Thanh Hai ; Lee, Dong-Choon ; Lee, Kyo-Beum ; Kim, Jang-Mok ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 778~786
DOI : 10.6113/JPE.2012.12.5.778
In this paper, a novel scheme for the condition monitoring of lithium polymer batteries is proposed, based on the sigma-point Kalman filter (SPKF) theory. For this, a runtime-based battery model is derived, from which the state-of-charge (SOC) and the capacity of the battery are accurately predicted. By considering the variation of the serial ohmic resistance (
) in this model, the estimation performance is improved. Furthermore, with the SPKF, the effects of the sensing noise and disturbance can be compensated and the estimation error due to linearization of the nonlinear battery model is decreased. The effectiveness of the proposed method is verified by Matlab/Simulink simulation and experimental results. The results have shown that in the range of a SOC that is higher than 40%, the estimation error is about 1.2% in the simulation and 1.5% in the experiment. In addition, the convergence time in the SPKF algorithm can be as fast as 300 s.
Hybrid Fuzzy PI-Control Scheme for Quasi Multi-Pulse Interline Power Flow Controllers Including the P-Q Decoupling Feature
Vural, Ahmet Mete ; Bayindir, Kamil Cagatay ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 787~799
DOI : 10.6113/JPE.2012.12.5.787
Real and reactive power flows on a transmission line interact inherently. This situation degrades power flow controller performance when independent real and reactive power flow regulation is required. In this study, a quasi multi-pulse interline power flow controller (IPFC), consisting of eight six-pulse voltage source converters (VSC) switched at the fundamental frequency is proposed to control real and reactive power flows dynamically on a transmission line in response to a sequence of set-point changes formed by unit-step reference values. It is shown that the proposed hybrid fuzzy-PI commanded IPFC shows better decoupling performance than the parameter optimized PI controllers with analytically calculated feed-forward gains for decoupling. Comparative simulation studies are carried out on a 4-machine 4-bus test power system through a number of case studies. While only the fuzzy inference of the proposed control scheme has been modeled in MATLAB, the power system, converter power circuit, control and calculation blocks have been simulated in PSCAD/EMTDC by interfacing these two packages on-line.
Novel Control Method for a Hybrid Active Power Filter with Injection Circuit Using a Hybrid Fuzzy Controller
Chau, MinhThuyen ; Luo, An ; Shuai, Zhikang ; Ma, Fujun ; Xie, Ning ; Chau, VanBao ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 800~812
DOI : 10.6113/JPE.2012.12.5.800
This paper analyses the mathematical model and control strategies of a Hybrid Active Power Filter with Injection Circuit (IHAPF). The control strategy based on the load harmonic current detection is selected. A novel control method for a IHAPF, which is based on the analyzed control mathematical model, is proposed. It consists of two closed-control loops. The upper closed-control loop consists of a single fuzzy logic controller and the IHAPF model, while the lower closed-control loop is composed of an Adaptive Network based Fuzzy Inference System (ANFIS) controller, a Neural Generalized Predictive (NGP) regulator and the IHAPF model. The purpose of the lower closed-control loop is to improve the performance of the upper closed-control loop. When compared to other control methods, the simulation and experimental results show that the proposed control method has the advantages of a shorter response time, good online control and very effective harmonics reduction.
Development of a Data Acquisition System for the Testing and Verification of Electrical Power Quality Meters
Simic, Milan ; Denic, Dragan ; Zivanovic, Dragan ; Taskovski, Dimitar ; Dimcev, Vladimir ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 813~820
DOI : 10.6113/JPE.2012.12.5.813
This paper presents the development of a software supported acquisition system for metrological verification and testing of the equipment for monitoring and analysis of the basic electrical power quality parameters. The described procedure consists of two functionally connected segments. The first segment involves generation of the reference three-phase voltage signals, including the possibility of simulation of the various power quality disturbances, typical for electrical power distribution networks. The second part of this procedure includes the real-time recording of power quality disturbances in three-phase distribution networks. The procedure is functionally supported by the virtual instrumentation concept, including a software application developed in LabVIEW environment and data acquisition boards NI 6713 and NI 9215A. The software support of this system performs graphical presentation of the previously generated and recorded signal waveforms. A number of the control functions and buttons, implemented on the virtual instrument front panels, are provided to adjust the basic signal acquisition, generation and recording parameters.
Real-Time Implementation of Shunt Active Filter P-Q Control Strategy for Mitigation of Harmonics with Different Fuzzy M.F.s
Mikkili, Suresh ; Panda, Anup Kumar ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 821~829
DOI : 10.6113/JPE.2012.12.5.821
This research article presents a novel approach based on an instantaneous active and reactive power component (p-q) theory for generating reference currents for shunt active filter (SHAF). Three-phase reference current waveforms generated by proposed scheme are tracked by the three-phase voltage source converter in a hysteresis band control scheme. The performance of the SHAF using the p-q control strategy has been evaluated under various source conditions. The performance of the proposed control strategy has been evaluated in terms of harmonic mitigation and DC link voltage regulation. In order to maintain DC link voltage constant and to generate the compensating reference currents, we have developed Fuzzy logic controller with different (Trapezoidal, Triangular and Gaussian) fuzzy M.F.s. The proposed SHAF with different fuzzy M.F.s is able to eliminate the uncertainty in the system and SHAF gains outstanding compensation abilities. The detailed simulation results using MATLAB/SIMULINK software are presented to support the feasibility of proposed control strategy. To validate the proposed approach, the system is also implemented on a real time digital simulator and adequate results are reported for its verifications.
A Fuzzy Based Solution for Allocation and Sizing of Multiple Active Power Filters
Moradifar, Amir ; Soleymanpour, Hassan Rezai ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 830~841
DOI : 10.6113/JPE.2012.12.5.830
Active power filters (APF) can be employed for harmonic compensation in power systems. In this paper, a fuzzy based method is proposed for identification of probable APF nodes of a radial distribution system. The modified adaptive particle swarm optimization (MAPSO) technique is used for final selection of the APFs size. A combination of Fuzzy-MAPSO method is implemented to determine the optimal allocation and size of APFs. New fuzzy membership functions are formulated where the harmonic current membership is an exponential function of the nodal injecting harmonic current. Harmonic voltage membership has been formulated as a function of the node harmonic voltage. The product operator shows better performance than the AND operator because all harmonics are considered in computing membership function. For evaluating the proposed method, it has been applied to the 5-bus and 18-bus test systems, respectively, which the results appear satisfactorily. The proposed membership functions are new at the APF placement problem so that weighting factors can be changed proportional to objective function.
Power Electronics Open-Source Educational Platform
Pozo-Ruz, Ana ; Aguilera, F. David Trujillo ; Moron, M. Jose ; Rivas, Ernesto ;
Journal of Power Electronics, volume 12, issue 5, 2012, Pages 842~850
DOI : 10.6113/JPE.2012.12.5.842
Learning Power Electronics is essential in both electrical and electronic engineering fields and the introductory courses are similar in many universities. Taking this premise into account, an educational computer-aided platform for power electronics will be presented in this paper. This educational platform includes an e-book, a set of power electronics animations, Java simulations, as well as several hands-on training sessions. The main advantages of this platform are twofold. First, all necessary teaching tools are combined on a single platform. And secondly, access to this platform is available free of charge and with no complicated registration requirements. In addition to traditional teaching techniques, the use of this platform has demonstrated an increase in student participation and has consistently improved their academic performance. Data consist of surveys, which guarantee both reliability and validity through psychometric techniques.