An Improved Strategy for VSG Low-Voltage Ride-through Based on Active Power Command Value Correction and Phase Compensation

The virtual synchronous generator (VSG) improves the stability of distributed power grid connection by simulating the working principle of the synchronous generator and introducing virtual inertia and damping coefficient. However, when a voltage sag occurs in the power grid, both the sag and the recovery of the voltage will cause a jump in the phase and amplitude of the grid voltage, and the traditional VSG control strategy is difficult to solve this problem. To this end, a VSG low-voltage ride-through control method based on active power command value correction and phase compensation is proposed in this paper. Firstly, a model was established to analyze the amplitude and phase jumps of the fault point voltage when a symmetrical short circuit occurred. Secondly, an improved method for correcting the active power command value and phase compensation was proposed. Finally, the effectiveness of the proposed control strategy was verified through MATLAB/Simulink simulation.