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김찬식(C.K.Kim),곽주식(J.s. wak),우정욱(J.W.Woo),정길조(G.J.Jeong) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
본 논문은 전력전자 시스템의 방열판 시스템에 대한 이론과 실제 시스템을 고찰하고 있다. 본 논문에는 공냉식과 수냉식 방열 시스템에 관한 내용이 있다.
김찬기(C.K.Kim),곽주식(J.S.Kwak),고봉언(B.U.Ko),우정욱(J.W Woo),심응보(U.B.Shim),정길조(G.J.Jeong) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper deals with HVDC Light(High Voltage Direct Current) system using space vector PWM(SVPWM) method Because the system of this paper has d-q control scheme for HVDC Light system. HVDC Light system represented in this paper is capable of controlling active and reactive power independently. For this system, V-I curve and control methods are proposed. Also this paper describes the design of a digital system for applications m power converters such as those that would be used m the next generation of HVDC system Finally, HVDC system is implemented using DSP TMS320C31
김찬기(C.K.Kim),양병모(B.M.Yang),박종광(J.G.Park),정길조(G.J.Jeong) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
This paper deals with the frequency sensing methods at HVDC system. The objects of frequency Information in HVDC system areto fire a valve and to control a frequency of AC network. Conventionally, there are two methods to measure a frequency of AC network. The first method is to draw out from the synchronous machine and the second method is from AC network. Two methods have advantages and disadvantage each other For the extreme case of a receiving system of zero inertia (no generation), synchronous machine is essential. In This situation, the frequency Information received from the synchronous machine shaft However, the speed of synchronous machine is oscillated when a disturbance In AC network occurs, and HVDC may be oscillated due to an oscillation speed To solve This drawback, in This paper, new<br/> frequency sensing method is proposed. A<br/> proposed method that is use a modified curve-fitting algorithm, has a robust characteristics against a harmonics and unbalanced faults Consequently, A proposed method is verified by PSCAD/EMTDC program and experimental test
11차/13차 고조파를 동시에 제거하는 Single Tuned 필터
김찬기(C.K. Kim),양병모(B.M. yang),정길조(G.J. Jeong),안정식(J.S. Ahan) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
Two non-conventional HVDC converter arrangements are compared, These include the Capacitor Commutated Converter (CCC) in which series capacitors are included between the converter transformer and the valves, and the Controller Series Capacitor Converter (CSCC), based on more conventional topology, m which series capacitors are inserted between the AC filter bus and the AC network. Results show that both options have comparable steady state and transient performance, Danger of ferroresonance with the CSCC option is eliminated by controlng the amount of series compensation, The dynamic performance simulations is performed by PSCAD/EMTDC<br/>