Small signal modeling and stability analysis of virtual synchronous generators

In this paper, the inverter control strategy based on Virtual Synchronous Generator (VSG) is analyzed and the power loops of VSG are explained. Then the eigenvalue method of small-signal modeling is used to prove the stability of the VSG. The key parameters including inertial coefficient, exciting coefficient, drooping coefficient and the virtual impedance were analyzed by the eigenvalues and sensitivity. The system is simulated and the eigenvalues are calculated by Matlab.