Abstract: In traditional VSG (Virtual Synchronous Generator) voltage and current double closed-loop control, the anti-disturbance performance is poor, and the influence of system parameter changes and uncertainties is great. In order to solve the problems, a nonlinear PID(Proportion Integration Differentiation) based on tracking differentiator is used to control the outer voltage loop and the inner current loop, and the dynamic response of the system is adjusted in real time according to the feedback value of the output signal, so as to achieve the effect of stable output. The correctness and effectiveness of the double closed-loop control of microgrid virtual synchronous generator based on nonlinear PID are verified by simulation. 

Key words: microgrid, virtual synchronous generator, moment of inertia adaptive, voltage and current double closed-loop control, nonlinear proportional integration and differentiation (PID)