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Photovoltaic Power Conditioning System With Line Connection

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3 Author(s)
Jung-Min Kwon ; Dept. of Electron. & Electr. Eng., Pohang Univ. of Sci. & Technol. ; Kwang-Hee Nam ; Bong-Hwan Kwon

A photovoltaic (PV) power conditioning system (PCS) with line connection is proposed. Using the power slope versus voltage of the PV array, the maximum power point tracking (MPPT) controller that produces a smooth transition to the maximum power point is proposed. The dc current of the PV array is estimated without using a dc current sensor. A current controller is suggested to provide power to the line with an almost-unity power factor that is derived using the feedback linearization concept. The disturbance of the line voltage is detected using a fast sensing technique. All control functions are implemented in software with a single-chip microcontroller. Experimental results obtained on a 2-kW prototype show high performance such as an almost-unity power factor, a power efficiency of 94%, and a total harmonic distortion (THD) of 3.6%

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Industrial Electronics, IEEE Transactions on  (Volume:53 ,  Issue: 4 )