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General control strategy to limit peak currents of Virtual Synchronous Generator under voltage sags

Virtual Synchronous Generator (VSG) can facilitate friendly integration of distributed generations. However, during voltage sags, traditional VSG control cannot provide reactive power support, or limit the peak current. To solve these problems, a general control strategy of VSG under voltage sags is proposed. First, the topology of VSG and its control scheme are described to formulate the key problem. Then, three typical control modes are analyzed individually and the methods of generating power references are designed correspondingly. For practical application, the calculation of power reference is modified into a simple and unified form that is applicable to the three modes. Simulation results are reported to verify the validity and effectiveness of the proposed control strategy.