Power conversion interface for small‐capacity wind power generation system.

Power conversion interface for small‐capacity wind power generation system based on permanent‐magnet synchronous generator (PMSG) is proposed in this paper. The proposed power conversion interface will convert the wind power generated from the three‐phase PMSG to a high quality power to inject into the single‐phase utility. This power conversion interface comprises of a power converter and a zero‐sequence transformer set. The power converter is controlled to generate a set of positive‐sequence currents to absorb a real power from the three‐phase PMSG and a set of zero‐sequence currents to pass through the zero‐sequence transformer set to the single‐phase utility. A feed‐forward control is used to control the proposed power conversion interface so as to simplify the control circuit. A simplified maximum power point tracking method is also proposed and incorporated in the control circuit of the power conversion interface to extract the maximum power of the PMSG‐based wind power generation system. Hence, the proposed power conversion interface has the advantages of simplifying both the power circuit and the control circuit. A prototype is developed to demonstrate the performance of the proposed power conversion interface. The experimental results show that the proposed power conversion interface can achieve the expected performance. [ABSTRACT FROM AUTHOR]