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PV용 계통연계형 인버터의 새로운 Topology 고찰
정영석(Jung Youngseok),유권종(Yu Gwonjong) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
Recently, according to developing industry and life style, power consumption have been increased year after year. Currently these much power demand from power consumer is weakening the allowable power reverse margin ill summer As on of the remedies about this problem, the small scale grid-connected photovoltaic system is considered fo auxiliary power source. Generally, grid-connected inverter have a isolation transformer for electrical isolation from utility Thi paper propose transformerless system topology an inquiry the validity using simulation.
정영석(Jung Youngseok),유권종(Yu Gwonjong),정명웅(Jung Myoungwoong),최재호(Choi. Jaeho),최주엽(Choi Juyeop) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
This paper describes a new interactive inverter between a photovoltaic(PV) array and single-utility that avoid the bulky input (60Hz) transformer on the AC side The interface employs a pwm boost converter on the DC slde followed by a pwm current-forced single-phase rectifier for injecting the power from the PV array into the mains. The current waveform at the AC side remains sinusoidal and exactly in phase at all time. The circuit also has the advantage of requiring fewer switching device than high-frequency link system. This paper describes modeling of PV array and new system topology Simulation results on the performance of the connection are also presented
태양전지 모의 전원을 이용한 MPPT 알고리즘의 비교 고찰
정영석(Jung Youngseok),소정훈(So Junghun),유권종(Yu Gwonjong),최재호(Choi Jaeho) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.11
As the maximum power operating point (MPOP) of photovoltaic (PV) power systems changes with changing atmospheric conditions, the efficiency of maximum power point tracking (MPPT) is important in PV power systems. Many MPPT techniques have been considered in the past, but techniques using microprocessors with appropriate MPPT algorithms are favored because of their flexibility and compatibility with different PV arrays. Although the efficiency of these MPPT algorithms is usually high, it drops noticeably in case of rapidly changing atmospheric conditions. In this paper, we proposed a new MPPT control method called improved perturb and observe method (ImP&O), and a Simple voltage and current characteristic equation of a PV array for PV array simulator. Experimental results verify the accuracy and excellent performance of the proposed MPPT method. ImP&O algorithm is very simple, and has successful tracked the MPOP, even in case of rapidly changing atmospheric conditions