Comparative Study on Harmonic Suppression Methods for Virtual Synchronous Generator under Grid Voltage Distortions and Nonlinear Loads

In renewable power generations, the technology of virtual synchronous generator (VSG) is one effective way to solve the issue of lacking inertia and damping of the traditional grid-connected system. In order for VSG to perform well under complex conditions where the permeability of nonlinear load is high and the distortion of grid voltage is serious, harmonics suppression strategies need to be deeply studied. This paper first points out the power quality problems of grid current and PCC voltage, and then conducts a comparative study on four existing harmonics suppression schemes applied in the VSG-based grid connected system. Finally, the analysis has been verified by the simulations. Merits and problems of various schemes are clearly revealed, which is helpful for practical application.