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태양광 발전시스템의 부분그늘 보상을 위한 알고리즘에 관한 연구
고강훈(K.H.Koh),이현우(H.W.Lee),서기영(K.Y.Suh),고희석(H.S.Koh),문성찬(S.C.Moon) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
In this paper, compare and analyze existent MPPT algorithms Existent algorithms have defects which don't generate it in a partial shade or low insolation. Therefore, to supplement it, we design improved IncCond algorithm consisted of a Aux. switch and capacitor with Generation Control circuit which can always obtain maximum generation power at the factor which is reduced generational efficiency by<br/> partial shade. Generation Control circuit is<br/> method which can always get maximum output power as it regularly controls each voltage of serial connected solar cell. Accordingly, it can improve efficiency and confidence of utility interaction inverter.<br/> Construction of system use a low price PIC16F87X. We analyze special character according to system operation through simulation and prove the validity through experiments.
승강압초퍼와 부분공진 인버터를 이용한 계통연계형 태양광 발전시스템
고강훈(K.H.Koh),이현우(H.W.Lee),김영철(Y.C.Kim),정명웅(M.W.-Jung),홍두성(D.S.Hong) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In a utility interactive photovoltaic system, a PWM inverter is used for the connection between the photovoltaic arrays and the utility The DC current becomes pulsated when the conventional inverter system operates in the continuous current mode and DC current pulsation causes the distortion of the AC current waveform. This paper presents the reduced pulsation of DC input current by operating the inverter with buck-boost chopper in the discontinuous conduction mode. The DC<br/> current which contains harmonics component is analyzed by means of separating into two terms of a ripple component and a direct component. The constant DC current without pulsation is supplied from photovoltaic array to the inverter. The proposes inverter system provide a sinusoidal AC current for domestic loads and the utility lme with unity power factor.
문경희(K.H Mun),고강훈(K.H. Koh),김은수(E.S Kim),곽동걸(D.K Kwaku),조판제(P.J. Chou),이현우(H.W. Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
For decrease the harmonic current components of the power source, a first method is insert the choke coil that used the choke Input type rectifier, the booster chopper circuit and buck chopper circuit. And the several method are studying like as the PWM (Pulse Width Modulation) converter and the active filter type witch is used the high frequency switching and the sinusoidal wave formed input current. In this type, there are many problem as a low efficiency, Increased the noise, the high leakage current and cost up by the high frequency switching For improve this problems, the partlal resonan method 1S used on the booster inducter and lossles snubber condenser. This method decreased the distortion factor has lower harmonic components than the hard switching and there is no switching loss by the ZCS(Zero Current Switching) at switch turn-on and the ZVS(Zero Voltage switching) at switch turn-off
정전압형 전자식 안정기 회로의 고조파 저감을 위한 PFC회로의 설계
이현무(H.M.Lee),고강훈(K.H.Koh),고희석(H.S.Koh),이현우(H.W.Lee) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
In this paper, a PFC(Power Factor Correction) electronic ballast with constant voltage-fed is proposed. The proposed PFC electronic ballast is combined of a High-efficiency boost converter and a conventional half bridge inverter. It is proved that the ripple of input-current and the input-current"s harmonic of the proposed PFC electronic ballast are reduced using the voltage divider and soft-switching technique. It is demonstrated that simulation results for 40[W] fluorescent lamp correspond with theoretical analysis.
이민기(M.K-Lee),고강훈(K.H-Koh),서기영(K.Y-Suh),권순걸(S.K-Kwon),임근희(G.H-Rim),이현우(H.W-Lee) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
Magnetic flux saturation depend on phase of Initial input power to high voltage transformer used in Micro wave oven.<br/> To limit inrush current high voltage transformer the relay contact should be "on" when the lowest point of input voltage phase.<br/> The improved circuit is for compensate interrupt signal Micom mput so the relay contact can be "on" when the inrush current is lower.<br/> Test result adapted said improved circuit for input voltage variation mode comply the limit 50A of requirement.
전력 평형/불평형 경계점 제어를 이용한 전류제어루프에러 MPPT제어기에 관한 연구
강태경(T. K. Kang),고강훈(K. H. Koh),노순식(S. S. No),강주성(J. S. Kang),이준엽(J. Y. Lee),우정인(J. I. Woo),이현우(H. W. Lee) 한국조명·전기설비학회 2005 한국조명·전기설비학회 학술대회논문집 Vol.2005 No.5월
This paper proposes a simple MPPT control scheme of a Current-Control-Loop Error system Based that can be obtains a lot of advantage to compare to compare with another digital control method, P&O and IncCond algorithm, that is applied mostly a PV system. An existent method is needed an expensive processor such as DSP that calculated to change the measure power of a using current and voltage sensor at the once. Therefore, it is applied a small home power generation system that required many expenses. But, a proposed method is easy to solve the cost reduction and power unbalance problems that It is used by control scheme to limit error of a current control of common sensor. This proposed algorithm had verified through a simulation and an experiment on battery charger using PIC that is the microprocessor of a low price.