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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
Selecting the target year
A Study on Residential Hybrid Distribution System for Reducing Power Conversion Loss
Byen, Byeng-Joo ; Seo, Hyun-Uk ; Choi, Jung-Muk ; Lee, Young-Jin ; Choe, Gyu-Ha ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 413~421
DOI : 10.6113/TKPE.2013.18.5.413
This paper proposes residential hybrid distribution system that can supply AC power and DC power to AC load and DC load at the same time. This hybrid distribution system consists of three parts: bidirectional inverter, step-up converter and step-down converter. Also that is used to supply voltage to home application is classified of AC load and DC load as load characteristics. The performance of proposed hybrid distribution system is validated through the hardware implementation and the experimental results.
DC-Link Voltage Unbalance Compensation of Reactive Power Compensator using Multi-level Inverter
Kim, Hyo-Jin ; Jung, Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 422~428
DOI : 10.6113/TKPE.2013.18.5.422
Recently, we use a static synchronous compensator(STATCOM) with cascaded H-bride topologies, because it is easy to increase capacity and to reduce total harmonic distortion(THD). When we use equipment for reactive power compensation, dc-link voltage unbalances occur from several reasons although loads are balanced. In the past, switching pattern change of single phase inverter and reference voltage magnitude change of inverter equipped with power sensor have been used for dc-link voltage balance. But previous methods are more complicated and expensive because of additional component costs. Therefore, this paper explains reasons of dc-link voltage unbalance and proposes solution. This solution is complex method that is composed of reference voltage magnitude change of inverter without additional hardware and shifted phase angle of inverter reference voltages change. It proves possibility through 1000[KVA] system simulation.
High Efficiency Resonant Converter for Bidirectional Power Transfer
Park, Jun-Hyoung ; Lee, Seung-Min ; Kim, Eun-Soo ; Hwang, In-Gab ; Kong, Young Su ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 429~436
DOI : 10.6113/TKPE.2013.18.5.429
In this paper, For achieving the high gain and resonant characteristics in both of the power flow directions, a bidirectional resonant dc-dc converter with auxiliary switches is proposed. Auxiliary switches are connected in the primary and secondary side of the bidirectional resonant dc-dc converter, respectively. A 800W prototype bidirectional resonant dc-dc converter for interfacing the 400V DC buses in the energy storage system is built and tested to verify the validity and applicability of this proposed converter.
Flux Weakening Control for Surface Mounted Permanent Magnet Synchronous Machine Driven by Dual Inverter
Kim, Youngnam ; Lee, Yongjae ; Ha, Jung-Ik ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 437~442
DOI : 10.6113/TKPE.2013.18.5.437
For open-end permanent magnet synchronous machine(PMSM) with dual inverter system, where one inverter is connected to the source and the other is flying, the dc link voltage of the flying inverter can be boosted through the machine. For this reason, when compared with single inverter drive system, higher voltage can be applied to PMSM, and higher torque can be generated in the flux weakening region. In this case, however, active and reactive powers are separately supplied by each inverter to maintain the dc link voltage of flying inverter. Therefore, the required flux weakening control is different from the conventional method for a single inverter drive system. This paper proposes the novel flux weakening control method which maximizes the active voltage component in a dual inverter PMSM drive system. The proposed method was demonstrated and verified through experimental results.
Development of Battery Charger for Electric Vehicle using the LLC Resonant Converter
Kim, Gyoung-Man ; Yoo, Jong-Uk ; Kim, Tae-Kwon ; Kang, Chan-Ho ; Chun, Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 443~447
DOI : 10.6113/TKPE.2013.18.5.443
This paper deals with LLC resonant converter of on-board charger for electric vehicle charging. Generally, the on-board charger must have a very widely charging voltage, higher efficiency, higher power factor, lower volume and lower weight. For reducing the switching losses, voltage and current stress of the device, the on-board charger is apply the half-bridge LLC resonant converter topology. To have a wide voltage range, it is design the hardware parameters and determine the switching frequency range of the LLC resonant converter. The experimental results show a wide charge voltage.
Control Method of Distributed-Module Type Photovoltaic Power Conditioners under Stand-alone Operation
Seo, Jung-Won ; Park, Joung-Hu ; Kim, Hye-Rim ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 448~457
DOI : 10.6113/TKPE.2013.18.5.448
This paper proposes a control method under stand-alone operating mode for distributed-module type photovoltaic power conditioners. In conventional schemes, there are some problems of a controller saturation in the DC-link (or load) voltage controller when overly-heavy load, light load, and the generated PV power reduction occurs, as well as when a transition occurs from an overly-loaded to normal conditions. To overcome these problems, the proposed controller method switches the main control target from DC-link voltage to the maximum power point, which is closer to the stable operating point when it returns to normal operating conditions. For the analysis, a state-plane trajectory was given and the circuit analysis by PSIM simulation was done. For the verification, a prototype hardware with 110[W] and 50[W] dual photovoltaic modules has been implemented. From the results, it can be seen that PV power tracking is successfully done with the proposed method even under a stand-alone operation mode.
A Novel Soft Switched Auxiliary Resonant Circuit of a PFC ZVT-PWM Boost Converter for an Integrated Multi-chips Power Module Fabrication
Kim, Yong-Wook ; Kim, Rae-Young ; Soh, Jae-Hwan ; Choi, Ki-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 458~465
DOI : 10.6113/TKPE.2013.18.5.458
This paper proposes a novel soft-switched auxiliary resonant circuit to provide a Zero-Voltage-Transition at turn-on for a conventional PWM boost converter in a PFC application. The proposed auxiliary circuit enables a main switch of the boost converter to turn on under a zero voltage switching condition and simultaneously achieves both soft-switched turn-on and turn-off. Moreover, for the purpose of an intelligent multi-chip power module fabrication, the proposed circuit is designed to satisfy several design constraints including space saving, low cost, and easy fabrication. As a result, the circuit is easily realized by a low rated MOSFET and a small inductor. Detail operation and the circuit waveform are theoretically explained and then simulation and experimental results are provided based on a 1.8 kW prototype PFC converter in order to verify the effectiveness of the proposed circuit.
Three-Phase Z-Source PWM Rectifier Based on the DC Voltage Fuzzy Control
Qiu, Xiao-Dong ; Jung, Young-Gook ; Lim, Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 466~476
DOI : 10.6113/TKPE.2013.18.5.466
This paper describes a fuzzy control method to control the output voltage of the three-phase Z-source PWM rectifier. A fuzzy control system is a control system based on fuzzy logic, and the fuzzy controller uses a single input fuzzy theory with its fuzzification. Analytical structure of the simplest fuzzy controller is derived through the triangular membership functions with its fuzzification. By setting the membership functions of the fuzzy rules, fuzzy control is achieved. The PI portion of the output DC voltage controller is controlled by fuzzy method. To confirm the validity of the proposed method, the simulation and experiment were performed, The simulation is performed with PSIM and MATLAB/SIMULINK. For the experiment, we used a DSP(TMS320F28335) controller to compute the reference value and generate the PWM pulses. For the transient state performance of the output DC voltage control of Z-source PWM rectifier, the PI controller and fuzzy controller were compared, also the conventional PWM rectifier and Z-source PWM rectifier were compared. From the results, the Z-source rectifier could allow to buck or boost of the output DC voltage. Through the analysis of the transient state, we could observe that the fuzzy controller has better performance than the conventional PI controller.
A Novel Active Clamp Switching Method To Improve of Efficiency For Photovoltaic MIC
Park, Byung-Chul ; Park, Ji-Ho ; Song, Sung-Geun ; Park, Sung-Jun ; Shin, Joong-Rin ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 477~484
DOI : 10.6113/TKPE.2013.18.5.477
This paper proposes a novel switching method of active clamp snubber for efficiency improvement of PV module integrated converter(MIC) system. Recently, MIC solar system is researched about the efficiency and safety. PV MIC system is used active clamp method of snubber circuit for the price and reliability of the system. But active clamp snubber circuit has the disadvantage that system efficiency is decreased for switch operating time because of heat loss of resonant between snubber capacitor and leakage inductance. To solve this problem, this paper proposes a novel switching method of the active clamp. The proposed method is a technique to reduce power consumption by reducing the resonance of the snubber switch operation time and through simulations and experiments proved the validity.
High Efficiency Lossless Snubber for Photovoltaic Maximum Power Point Tracker
Jang, Du-Hee ; Kang, Jeong-Il ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 485~491
DOI : 10.6113/TKPE.2013.18.5.485
A new passive lossless snubber for boost converter based on magnetic coupling is proposed. It is composed of a winding coupled with boost inductor, one snubber inductor, two snubber capacitor and three additional diodes. Especially, the snubber inductor can not only limit the reverse recovery current of output diode but also minimize switch turn-on losses greatly. Moreover, all of the energy stored in the snubber is transferred to the load in the manner of resonance. To confirm the validity of proposed system, theoretical analysis, design consideration, and verification of experimental results are presented.
Balanced Forward-Flyback Converter for High Efficiency and High Power Factor LED Driver
Hwang, Min-Ha ; Kang, Jeong-Il ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 492~500
DOI : 10.6113/TKPE.2013.18.5.492
A balanced forward-flyback converter for high efficiency and high power factor using a foward and flyback converter topologies is proposed in this paper. The conventional AC/DC flyback converter can achieve a good power factor but it has the high offset current through the transformer magnetizing inductor, which results in a large core loss and low power conversion efficiency. And, the conventional forward converter can achieve the good power conversion efficiency with the aid of the low core loss but the input current dead zone near zero cross AC input voltage deteriorates the power factor. On the other hand, since the proposed converter can operate as the forward and flyback converters during switch turn-on and turn-off periods, respectively, it cannot only perform the power transfer during an entire switching period but also achieve the high power factor due to the flyback operation. Moreover, since the current balanced capacitor can minimize the offset current through the transformer magnetizing inductor regardless of the AC input voltage, the core loss and volume of the transformer can be minimized. Therefore, the proposed converter features a high efficiency and high power factor. To confirm the validity of the proposed converter, theoretical analysis and experimental results from a prototype of 24W LED driver are presented.
Phase-Shifted Full Bridge(PSFB) DC/DC Converter with a Hold-up Time Compensation Circuit for Information Technology (IT) Devices
Yi, Kang-Hyun ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 5, 2013, Pages 501~506
DOI : 10.6113/TKPE.2013.18.5.501
A hold-up time compensation circuit is proposed to get high efficiency of the front-end phase-shifted full bridge DC/DC converter. The proposed circuit can make the phase-shifted full bridge front-end DC/DC converter built with 0.5 duty ratio so that the conduction loss of the primary side and voltage stress across rectifier in the secondary side are reduced and the higher efficiency can be obtained. Furthermore, the requirement of an output filter significantly can diminish due to the perfect filtered waveform. A 12V/100A prototype has been made and experimental results are given to verify the theoretic analysis and detailed features.