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Transformerless Three-Phase Line-connected Photovoltaic PCS  

Seo, Hyun-Woo (포항공대 전자전기공학과)
Kwon, Jung-Min (포항공대 전자전기공학과)
Kwon, Bong-Hwan (포항공대 전자전기공학과)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.12, no.5, 2007 , pp. 355-363 More about this Journal
Abstract
In this paper, the transformerless three-phase line-connected PV PCS (photovoltaic power conditioning system) is proposed. An improved P&O (perturb and observe) MPPT (maximum power point tracking) algorithm that prevents local maximum power point tracking is proposed. By controlling the three-phase line-connected voltage source inverter using outer DC-link voltage controller, inner current controller and microcontroller friendly simplified space vector modulation (SVM) method, a unity power factor is achieved. An algorithm is suggested to control the DC-link voltage faster and more correctly for the increase system stability and power factor. All algorithms and controllers are implemented on a single-chip microcontroller and the superiority of the proposed algorithms and controllers is proved by experiments.
Keywords
Photovoltaic; MPPT; PCS; SVM;
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