State Space Modeling Method of Microgrid Based on Virtual Synchronous Generator

The microgrid based on the virtual synchronous generator (VSG) applies the virtual synchronous generator control strategy to provide inertia and damping to the system, but the inherent stability problems of power electronic devices cannot be avoided. The eigenvalue analysis method is a common stability research method. It can judge whether the system is in a stable state, and at the same time, it can draw the characteristics and key parameters of the system's oscillation, and optimize the system parameters based on the conclusion. The premise of eigenvalue analysis is to establish the state space model of the system. First of all, this paper comprehensively considers all aspects of VSG control strategy, and establishes a state space model of a single VSG. Secondly, based on the state space model of VSG, the state space modeling method of the microgrid based on the VSG is proposed. Finally, the results of hardware-in-the-loop (HIL) experiments verify the correctness and feasibility of the method, and provide a basis for further stability analysis and parameter optimization.