Improved control of parallel virtual synchronous generator based on adaptive voltage compensation

Aiming at the problem that the virtual synchronous generator (VSG) has power coupling in the medium and low voltage microgrids, a power decoupling method based on adaptive voltage compensation is proposed. The voltage is compensated to stabilize the reactive power at the rated value. The reliability of the improved method is verified by small-signal analysis of the power loop, and an improved decoupling controller is designed. Aiming at the problem of circulation in parallel operation of VSGs, the pre-synchronization control module is designed by analyzing the condition of stable operation of parallel VSGs. MATLAB/Simulink software is used to verify the effectiveness of the improved decoupling method and the pre-synchronization control module in both VSGs islanding and parallel operation. In order to be more practical, the Wind-PV-Super Capacitor microgrid model is used as the power source in the simulation environment.