The Research of Current Harmonic Suppression of Virtual Synchronous Generator on Active Disturbance Rejection Control

Since the beginning of the 21st century, due to the lack of energy on a global scale, distributed energy based on inverter interfaces has gradually been valued by countries all over the world, and its proportion in the power system has also increased year by year. Virtual synchronous generator technology has received extensive attention from many scholars in the world because of its ability to make the external interface of the distributed power generation system have the same damping characteristics and rotational inertia as the synchronous generator.Because the grid voltage often contains low-order harmonics, these grid voltage will cause the VSG grid-connected current to contain harmonics of the same frequency, as a result,the quality of grid-connected power will decrease.

I. INTRODUCTION

After entering the 21st century, due to the shortage of global energy ,the adopt distributed energy has gardually used in the power system. Because it can achieve a good connection with the inverter, its proportion has also continued to increase. However, compared with traditional synchronous generators usually used in power systems, distributed power generation systems still have some grid-connected defects, such as their response is too fast and there is almost no moment of inertia, so it is difficult to participate in grid regulation well. Incorporating it into the power grid will adversely affect the stability and anti-disturbance capability[1]-[2].