In recent, large penetration of photovoltaic power generation and wind power generation is promoted for a development of sustainable power supply system. Since most of those power generation system do not have inertia, replacement of synchronous generators with renewable energy resources causes reduction of inertia and deteriorate stability of power system such as transient stability and frequency stability. To solve the problem, the authors have studied Virtual Synchronous Generator (VSG) control by PMSG wind generator without battery energy storage. Since the system does not have a battery, kinetic energy of PMSG is used to absorb impact of system fault and rotating speed of PMSG is changed from optimal point. This paper proposes a novel VSG control including a function that recovers rotating speed of PMSG to optimal point. Simulation studies clarify the effectiveness of the proposed control system.
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