Abstract
A three-phase to single-phase direct AC power generation system based on the open-winding permanent magnet synchronous generator (PMSG) with the dual-inverter is proposed in this study for the standalone power system. The negative DC terminals of the dual-inverter are commonly connected, and the positive DC terminals are reconstructed as the output port of the single-phase AC power; the three-phase AC power generated by PMSG could be converted to be the high power quality single-phase AC power directly without any LC filters. Different from the traditional OW-PMSG system, zero-sequence current is employed to achieve adjustable frequency and voltage of the single-phase AC power, and the corresponding dual voltage-loop control strategy with the separate positive-sequence and zero-sequence currents regulation of PMSG is given to achieve high output performance. The effectiveness of the proposed control strategy and the output characteristics have been verified by simulation and the experiment of the prototype, and the results show that the high-quality single-phase AC power can be obtained at a wide speed range and at different load operating conditions.
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