Abstract
In view of the public AC bus's frequency stability problem of traditional droop control parallel inverters when load fluctuate frequently, virtual synchronous generator, VSG, is presented in this paper to instead traditional droop control in inverters parallel. The frequency stability of the public AC bus is improved and the output power is divided equally. In view of the VSG parallel preliminary synchronization, a preliminary synchronization method is designed based on phase-locked loop to realize the same phase between the VSG output voltage and public AC bus before paralleling. The simulation and experimental results verify the effectiveness of the proposed control strategy.
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