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권정민(Kwon, Jung-Min),김응호(Kim, Eung-Ho),남광희(Nam, Kwang-Hee),권봉환(Kwon, Bong-Hwan) 한국신재생에너지학회 2007 신재생에너지 Vol.3 No.4
In this paper, a PV multi-string PCS with a grid-connection is proposed. An improved MPPT algorithm for the PV multi-string PCS is suggested. Each PV string has its own MPP tracker and the proposed MPPT algorithm prevents LMPP tracking due to power ripple. In the PV PCS with single-phase inverter has a large current ripple at twice the grid frequency. The current ripple reduction algorithm without external component is suggested. Also, this paper proposes a simple control method to achieve sharing of the PV string voltage and current among the interleaved parallel boost converters. All algorithms and controllers are implemented on a single-chip microcontroller. Experimental results obtained on a 3kW prototype show high performance of the proposed PV multi-string PCS.
권정민(Kwon, Jung-Min),권봉환(Kwon, Bong-Hwan) 한국신재생에너지학회 2005 신재생에너지 Vol.1 No.2
A modular photovoltaic PCS with high-frequency isolation is proposed. The proposed system consists of a SEPIC converter and a full-bridge inverter Using the power slope versus voltage of the PV array, the MPPT controller is proposed that produces a smooth transition to the maximum power point. The dc current of the PV array is estimated without using a dc current sensor The disturbance of the line voltage is detected using a fast sensing technique. Experimental results obtained on a 500W prototype show high performance such as almost unity power factor, 90% power efficiency, 3.6% THD.