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원충연,장수진,이태원,이병국,김수석,Won, Chung-Yuen,Jang, Su-Jin,Lee, Tae-Won,Lee, Byoung-Kuk,Kim, Soo-Suck 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.5
양방향 컨버터는 연료전지 발전 시스템의 인버터 dc link와 저전압 배터리를 연결시켜 준다. 방전 모드(boost)에서는 저전압(battery: 48[V])측에서 고전압(dc link: 380[V])측으로, 충전 모드(buck)에서는 저전압측 배터리로 전력이 전달된다. 본 논문에서는 방전모드 시 MOSFET으로 구성된 1.5[kW] 능동 클램프 전류원 풀 브리지 컨버터가 동작하고 배터리 충전 시 IGBT로 구성된 전압원 하프 브리지 컨버터가 동작한다. The bi-directional converter interfaces the low voltage battery to the inverter do link of FC generation system. When power flows from the low voltage side(battery: 48[V]) to the high voltage side(dc link: 380[V]), the circuit works in discharge mode (boost) to power the high voltage side load; otherwise, it works in charge mode (buck) to charge the low voltage side battery. In this paper, the 1.5[kW] active clamp current-fed full bridge converter employing MOSFETs is operated to discharge the battery whereas a voltage-fed half bridge converter employing IGBTs is operated to charge the battery.
장수진(Su-Jin Jang),류동균(Dong-Kyun Ryu),원충연(Chung-Yuen Won),이진국(Jin-Kuk Lee),배기훈(Kee-Hun Bae),김수석(Soo-Suck Kim) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the output voltage constant under normal operating conditions at various levels<br/> The output voltage of Synchronous Generator is regulated constantly by field voltage control in excitation system.<br/> High frequency PWM converter (Buck converter) type excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition happened.<br/> The proper operation of the proposed excitation system was verified through the simulations and the experiments.
김수석,김하식 서울産業大學校 1994 논문집 Vol.39 No.1
The paper present of a steady-stste analysis of the converter operation. The design procedures based on the analysis are presented and various losses in the circuit assesssd. Critical design considerations for a high-power, low-voltage application are analyzed. The results of the analysis are verified using a PSPICE
김하식,김수석 서울産業大學校 1994 논문집 Vol.40 No.1
This paper proposes a new buck ZVT PWM Converter, where the voltage across MOSFET is clamped to the input voltage V1. The MOSFET turns on under zero voltage and the auxiliary switch turns off under zero current. It is possible to use MOSFET with a smaller Rds, because the voltage across it is clamped to the V1. The ZVS is neary independent from the load range. Principle of operation, analysis and simulation results are presented.
金漱石,金河植 서울産業大學校 1989 논문집 Vol.30 No.1
균일한 콘덴서 뱅크를 사용한 자여자 풍력발전기의 정특성 해석을 나타내었다. 해석과정과 이에 관계되는 컴퓨터 프로그램에 대해 논의하였다. 풍력발전기의 정특성 등가회로는 서로 다른 부하상태하에서 풍력발전기의 정특성운전을 예견하는데 사용되었다. This paper presents a method for the steady state analysis of self-excited wind turbine generators using balanced terminal capacitors. Operational and steady state equivalent circuits of the induction machine are employed to predict the steady state performance under different load conditions. The analytical procedure and the related computer program is described in the paper.
김수석,김하식 서울産業大學校 1995 논문집 Vol.41 No.1
Design Optimization routine is used to develop for ZVS PWM converter power stage. Various design trade-offs, Such as the ZVS range, the leakage inductance and the switching frequency are discussed. A 14.4V, 1kW ZVS-FB-PWM Converter is built following the design procedures. The hardware implementation and the experimental results are presented.
장수진,류동균,원충연,이진국,배기훈,김수석 성균관대학교 2003 학술회의지원논문목록집 Vol.2003 No.-
A synchronous generator is equipped with an automatic voltage regulator(AVR), which is responsible for keeping the output voltage constant under normal operating conditions at various levels. The output voltage of Synchronous Generator is regulated constantly by field voltage control in excitation system. High frequency PWM converter (Buck converter) type excitation system for synchronous generator that can sustain proper output voltage level even at the fault condition happened. The proper operation of the proposed excitation system was verified through the simulations and the experiments.