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풀브리지 컨버터를 갖는 1[kW] 연료전지 시스템 스위치 병렬 특성 분석
최중묵,한동화,이영진,정병환,최규하,Choi, Jung-Muk,Han, Dong-Hwa,Lee, Young-Jin,Jeong, Byong-Hwan,Choe, Gyu-Ha 한국조명전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.9
Fuel cell system which can solve the environmental problem is receiving attention. To use utility power necessary power conversion system from low voltage that is generated by fuel cell system. because fuel cell has special characteristic of low voltage high current. To improve PCS's efficiency the paralleling method is used. Available the method could reduce the switching loss. But the existing research could not be found optimal result and accompanying several effects. In this study analysis several effects causing the parallel method. The effects have been demonstrated through simulations and experiments.
단독운전방지를 위한 AFD 와 RPV 방식의 비교 분석
바이사(Bayasgalan),이영진(Young-Jin Lee),정병환(Byong-Hwan Jeong),김홍성(Hong-Sung Kim),최규하(Gyu-Ha Choe) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
To detect islanding mode when the grid is being tripped is a major safety issue in the Utility Interactive Distributed Generation (UIDG) system. In this paper, analytical design method is suggested for AFD & RPV method under IEEE929-2000 recommended islanding test condition. We have discussed that there is a same point. we injected reactive component of the current by AFD & RPV methods, but the current reference generated is other waveform. Possible if amount of reactive components in this methods are same each method, there is happened same rates frequency variation. To verify the validity of the analytical comparison, this paper presents simulation and experimental results from single phase, 3[㎾] inverter for the transformerless UIDG system.
송성근(Sung-Geun Song),박성준(Sung-Jun Park),최규하(Gyu-Ha Choe),정병환(Byong-Hwan Jeong) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
최근 산업계에서는 스위칭 손실을 저감하여 효율 및 성능 개선에 대한 다양한 토폴로지가 제안되고 있다. 특히 소프트 스위칭 방식은 낮은 전압과 전류 스트레스를 갖는 장점으로 인하여 절연형 DC/DC 컨버터에서 인덕터 사용 없이 트랜스포머의 누설리액턴스를 사용한 소프트 스위칭에 대한 연구가 활발히 이루어지고 있다. 본 논문에서는 소프트스위칭 특성을 갖는 새로운 DC/DC 컨버터 형태를 제안한다.
풀브리지 컨버터를 갖는 1[㎾] 연료전지 시스템 스위치 병렬 특성 분석
최중묵(Jung-Muk Choi),한동화(Dong-Hwa Han),이영진(Young-Jin Lee),정병환(Byong-Hwan Jeong),최규하(Gyu-Ha Choe) 한국조명·전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.9
Fuel cell system which can solve the environmental problem is receiving attention. To use utility power necessary power conversion system from low voltage that is generated by fuel cell system. because fuel cell has special characteristic of low voltage high current. To improve PCS's efficiency the paralleling method is used. Available the method could reduce the switching loss. But the existing research could not be found optimal result and accompanying several effects. In this study analysis several effects causing the parallel method. The effects have been demonstrated through simulations and experiments.
소프트스위칭의 연료전지용 고효율 멀티레벨 DC-DC 컨버터
김춘성(Chun-Sung Kim),김세민(Se-Min Kim),김광헌(Kwang-Heon Kim),박성준(Sung-Jun Park),정병환(Byong-Hwan Jeong),최규하(Gyu-Ha Choe) 전력전자학회 2009 전력전자학술대회 논문집 Vol.2009 No.1
This paper presents a high voltage resonant DC power converter that is using ZCS soft-switching method for fuel cells. Many converters secondary of transformer connect 3 series to input area. Resulting the converter operate high boost ratio and high efficiency. Also it is combined each filter in secondary of transformer to decrease the elements. A capacitor substitute the part of rectification diode in secondary of transformer. That is operated soft-switching with ZCS. Proposed resonant multi-level DC/DC converter verified by simulation.