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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 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
30kW DC-DC Converters with Regenerative Mode for Electric Cars
Ibanez, Federico ; Vadillo, Javier ; Maiza, Miguel Martinez-Iturralde ; Echeverria, Jose Martin ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 233~241
DOI : 10.6113/JPE.2012.12.2.233
This paper presents a design of a 30kW 250V/530V bidirectional DC-DC converter to be used in an electrical car. A detailed explanation of the design is given. The system uses two phase shifted half bridge (boost and buck) topologies to reduce the ripple current in the output capacitor. The converter has an efficiency of 95% at nominal power. It works as a constant voltage in one direction and as a constant current in the other to charge the batteries. Simulations and measurement are done at high power to test the efficiency.
Switching-Mode BJT Driver for Self-Oscillated Push-Pull Inverters
Borekci, Selim ; Oncu, Selim ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 242~248
DOI : 10.6113/JPE.2012.12.2.242
Self oscillating current fed push pull resonant inverters can be controlled without using special drivers. Dc current flows through the choke coil and the power switches, although the driving signals of the power switches are sinusoidal. When the base current is near zero, the transistors cannot be operated in switching mode. Hence higher switching power losses and instantaneous peak power during off transitions are observed. In this study, an alternative design has been proposed to overcome this problem. A prototype circuit has been built which provides dc bias current to the base of the transistors. Experimental results are compared with theoretical calculations to demonstrate the validity of the design. The proposed design decreases the peak and average power losses by about 8 times, when compared to conventional designs.
Interleaved DC-DC Converters with Partial Ripple Current Cancellation
Lin, Bor-Ren ; Chiang, Huann-Keng ; Cheng, Chih-Yuan ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 249~257
DOI : 10.6113/JPE.2012.12.2.249
An interleaved PWM converter is proposed to implement the features of zero voltage switching (ZVS), load current sharing and ripple current reduction. The proposed converter includes two ZVS converters with a common clamp capacitor. With the shared capacitor, the charge balance of the two interleaved parts is automatically regulated under input voltage and load variations. The active-clamping circuit is used to realize the ZVS turn-on so that the switching losses on the power switches are reduced. The ZVS turn-on of all of the switching devices is achieved during the transition interval. The interleaved pulse-width modulation (PWM) operation will reduce the ripple current and the size of the input and output capacitors. The current double rectifier (CDR) is adopted in the secondary side to reduce output ripple current so that the sizes of the output chokes and capacitor are reduced. The circuit configuration, operation principles and design considerations are presented. Finally experimental results based on a 408W (24V/17A) prototype are provided to verify the effectiveness of the proposed converter.
Analysis, Design and Implementation of an Interleaved Single-Stage AC/DC ZVS Converters
Lin, Bor-Ren ; Huang, Shih-Chuan ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 258~267
DOI : 10.6113/JPE.2012.12.2.258
An interleaved single-stage AC/DC converter with a boost converter and an asymmetrical half-bridge topology is presented to achieve power factor correction, zero voltage switching (ZVS) and load voltage regulation. Asymmetric pulse-width modulation (PWM) is adopted to achieve ZVS turn-on for all of the switches and to increase circuit efficiency. Two ZVS half-bridge converters with interleaved PWM are connected in parallel to reduce the ripple current at input and output sides, to control the output voltage at a desired value and to achieve load current sharing. A center-tapped rectifier is adopted at the secondary side of the transformers to achieve full-wave rectification. The boost converter is operated in discontinuous conduction mode (DCM) to automatically draw a sinusoidal line current from an AC source with a high power factor and a low current distortion. Finally, a 240W converter with the proposed topology has been implemented to verify the performance and feasibility of the proposed converter.
Soft Switching Bridgeless PFC Buck Converters
Emrani, Amin ; Mahdavi, Mohammad ; Adib, Ehsan ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 268~275
DOI : 10.6113/JPE.2012.12.2.268
Based on the standards that limit the harmonic pollution of electronic systems, the use of PFC converters is mandatory. In this paper, a new resonant bridgeless PFC converter is introduced. By eliminating the input bridge diodes, the efficiency is improved. Moreover, soft switching conditions for all of the semiconductor elements are achieved without adding any extra switches. As a result, high efficiency is attained. The proposed converter is analyzed and the theoretical and simulation results of the proposed converter are presented. In order to verify the validity of the analysis, a 40 w prototype converter is implemented and experimental results are presented. The experimental results show that high efficiency is attained while achieving a high power factor.
Common Mode Voltage Cancellation in a Buck-Type Active Front-End Rectifier Topology
Aziz, Mohd Junaidi Abdul ; Klumpner, Christian ; Clare, Jon ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 276~284
DOI : 10.6113/JPE.2012.12.2.276
AC/AC power conversion is widely used to feed AC loads with a variable voltage and/or a variable frequency from a constant voltage constant frequency power grid or to connect critical loads to an unreliable power supply while delivering a very balanced and accurate sinusoidal voltage system of constant amplitude and frequency. The load specifications will clearly impose the requirements for the inverter stage of the power converter, while wider ranges of choices are available for the rectifier. This paper investigates the utilization of a buck-type current source rectifier as the active front-end stage of an AC/AC converter for applications that require an adjustable DC-link voltage as well as elimination of the low-frequency common mode voltage. The proposed solution is to utilize a combination of two or more zero current vectors in the Space Vector Modulation (SVM) technique for Current Sources Rectifiers (CSR).
DSP-Based Simplified Space-Vector PWM for a Three-Level VSI with Experimental Validation
Ramirez, Jose Dario Betanzos ; Rivas, Jaime Jose Rodriguez ; Peralta-Sanchez, Edgar ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 285~293
DOI : 10.6113/JPE.2012.12.2.285
Multilevel inverters have gained attention in high-power applications due to their numerous advantages in comparison with conventional two-level inverters. In this paper a simplified Space-Vector Modulation (SVM) algorithm for a three-level Neutral-Point Clamped (NPC) inverter is implemented on a Freescale
DSP56F8037. The algorithm is based on a simplification of the space-vector diagram for a three-level inverter so that it can be used with a two-level inverter. Once the simplification has been achieved, calculation of the dwell times and the switching sequences are carried out in the same way as for the two-level SVM method. Details of the hardware design are included. Experimental results are analyzed to validate the performance of the simplified algorithm.
T-S Fuzzy Tracking Control of Surface-Mounted Permanent Magnet Synchronous Motors with a Rotor Acceleration Observer
Jung, Jin-Woo ; Choi, Han-Ho ; Kim, Tae-Heoung ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 294~304
DOI : 10.6113/JPE.2012.12.2.294
This paper proposes a fuzzy speed tracking controller and a fuzzy rotor angular acceleration observer for a surface-mounted permanent magnet synchronous motor (SPMSM) based on the Takagi-Sugeno (T-S) fuzzy model. The proposed observer-based controller is robust to load torque variations since it utilizes rotor angular acceleration information instead of the load torque value. Linear matrix inequality (LMI) sufficient conditions are given to compute the gain matrices of the speed tracking controller and the observer. In addition, it is mathematically verified that the proposed observer-based control system is asymptotically stable. Simulation and experimental results are presented to confirm that the proposed control algorithm assures a better transient behavior and less sensitivity under model parameter variations than the conventional PI control method.
Fuzzy Logic Speed Controller of 3-Phase Induction Motors for Efficiency Improvement
Abdelkarim, Emad ; Ahmed, Mahrous ; Orabi, Mohamed ; Mutschler, Peter ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 305~316
DOI : 10.6113/JPE.2012.12.2.305
The paper presents an accurate loss model based controller of an induction motor to calculate the optimal air gap flux. The model includes copper losses, iron losses, harmonic losses, friction and windage losses, and stray losses. These losses are represented as a function of the air gap flux. By using the calculated optimal air gap flux compared with rated flux for speed sensorless indirect vector controlled induction motor, an improvement in motor efficiency is achieved. The motor speed performance is improved using a fuzzy logic speed controller instead of a PI controller. The fuzzy logic speed controller was simulated using the fuzzy control interface block of MATLAB/SIMULINK program. The control algorithm is experimentally tested within a PC under RTAI-Linux. The simulation and experimental results show the improvement in motor efficiency and speed performance.
Approximate Equivalent-Circuit Modeling and Analysis of Type-II Resonant Immittance Converters
Borage, Mangesh ; Nagesh, K.V. ; Bhatia, M.S. ; Tiwari, Sunil ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 317~325
DOI : 10.6113/JPE.2012.12.2.317
Resonant immittance converter (RIC) topologies can transform a current source into a voltage source (Type-I RICs) and vice versa (Type-II RICs), thereby making them suitable for many power electronics applications. RICs are operated at a fixed frequency where the resonant immittance network (RIN) exhibits immittance conversion characteristics. It is observed that the low-frequency response of Type-II RINs is relatively flat and that the state variables associated with Type-II RINs affect the response only at the high frequencies in the vicinity of the switching frequency. The overall response of a Type-II RIC is thus dominated by the filter response, which is particularly important for the controller design. Therefore, an approximate equivalent circuit model and a small-signal model of Type-II RICs are proposed in this paper, neglecting the high-frequency response of Type-II RINs. While the proposed models greatly simplify and speed-up the analysis, it adequately predicts the open-loop transient and small-signal ac behavior of Type-II RICs. The validity of the proposed models is confirmed by comparisons of their results with those obtained from a cycle-by-cycle simulation and with an experimental prototype.
Active Damping for Wind Power Systems with LCL Filters Using a DFT
Lee, June-Seok ; Jeong, Hae-Gwang ; Lee, Kyo-Beum ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 326~332
DOI : 10.6113/JPE.2012.12.2.326
This paper proposes a simple active damping algorithm for small-scale wind power systems with an LCL filter. Compared to an L filter or an LC filter, an LCL filter can decrease the harmonics induced by low switching frequencies and produce a satisfactory grid-side current using a comparatively low inductance. Additional active damping of the filter resonance is necessary when an LCL filter is used. This paper introduces an active damping method using a Discrete Fourier Transform (DFT) filter to improve performance without additional sensors or complexity. Experimental results are shown to verify the validity of the proposed algorithm as an active damping method.
Flicker Suppression Scheme for Variable-Speed Wind Turbine Systems
Van, Tan Luong ; Nguyen, Thanh Hai ; Lee, Dong-Choon ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 333~343
DOI : 10.6113/JPE.2012.12.2.333
This paper proposes a strategy of flicker mitigation for doubly-fed induction generator (DFIG) wind turbine systems. In the weak grid system where the grid impedance ratio is low, the reactive power compensation only cannot suppress the flicker sufficiently due to the limited power capacity of the converters or the DFIG. For the full suppression of flickers, the active power smoothening using the energy storage system (ESS) needs to be utilized together with the reactive power compensation. The effectiveness of the proposed method is verified by PSCAD/EMTDC simulation results for a 2[MW] DFIG wind turbine system and by experimental results for a 3[kW] wind turbine simulator.
Theoretical Analysis and Control of DC Neutral-point Voltage Balance of Three-level Inverters in Active Power Filters
He, Yingjie ; Liu, Jinjun ; Tang, Jian ; Wang, Zhaoan ; Zou, Yunping ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 344~356
DOI : 10.6113/JPE.2012.12.2.344
In recent years, multilevel technology has become an effective and practical solution in the field of moderate and high voltage applications. This paper discusses an APF with a three-level NPC inverter. Obviously, the application of such converter to APFs is hindered by the problem of the voltage unbalance of DC capacitors, which leads to system instability. This paper comprehensively analyzes the theoretical limitations of the neutral-point voltage balancing problem for tracking different harmonic currents utilizing current switching functions from the space vector PWM (SVPWM) point of view. The fluctuation of the neutral point caused by the load currents of certain order harmonic frequency is reported and quantified. Furthermore, this paper presents a close-loop digital control algorithm of the DC voltage for this APF. A PI controller regulates the DC voltage in the outer-loop controller. In the current-loop controller, this paper proposes a simple neutral-point voltage control method. The neutral-point voltage imbalance is restrained by selecting small vectors that will move the neutral-point voltage in the direction opposite the direction of the unbalance. The experiment results illustrate that the performance of the proposed approach is satisfactory.
Investigation of "Unified Voltage Conditioner - UVC"
Antchev, Mihail ; Petkova, Mariya ; Gourgoulitsov, Vanjo ; Antchev, Hristo ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 357~362
DOI : 10.6113/JPE.2012.12.2.357
In this paper, a power electronic converter which is composed of two converters - bidirectional AC/DC converter and Series Active Power Filter (SAPF), is discussed. Structural schemas and ways of operation of control systems of converters, which are used to eliminate non sinusoidal parts of the network source voltage, are presented. At the same time, the control used stabilizes the value of the voltage feeding the load. Taking in consideration the combined functions which the device executes, it may be called Unified Voltage Conditioner - UVC.
Placement Optimization of Power Components in Static Power Converters under Spatial and Thermal Constraints
Larouci, Cherif ; Ejjabraoui, Kamal ; Lefranc, Pierre ; Marchand, Claude ;
Journal of Power Electronics, volume 12, issue 2, 2012, Pages 368~376
DOI : 10.6113/JPE.2012.12.2.368
This paper deals with an optimization approach of 3D space placement of power components under volume and thermal constraints. It consists in optimizing semiconductors positions on a heat sink by respecting the components junction temperatures and minimizing the heat sink size. The aim is to remove risks on the 3D converter components placement and ensure their effective integration before carrying out the first physical prototype. This approach is based on coupling an optimization environment with a thermal finite element simulation tool. A pre-sizing step using analytical models is performed to set the optimization computations coupled to numerical simulation.