Virtual Synchronous Generator Design Method Based on Stable Voltage and Frequency of the Machine

In view of the small distributed power generation unit, a sudden load or relief will cause the offset of the grid voltage and frequency, interfere the normal operation of the sensitive load. This paper presents a virtual synchronous generator control strategy based on the voltage and frequency stability of the machine, including the power frequency controller and the excitation controller. Power frequency controller can automatically adjust the frequency, and keep the system frequency stable near the set value. The excitation controller and the machine voltage stability system can adapt to the change of the system load and keep the voltage and frequency stable. Moreover, a virtual synchronous generator system is established based on the mathematical model of synchronous generator. The proposed design method has been validated through simulations, showing a good response performance of synchronous generator.