Research on Grid with Harmonic Based on Virtual Synchronous Generator

With more and more applications of DC microgrids in power systems, reasonable control methods need to be adopted so that DC microgrids can be connected to large power grids in a friendly manner. Most DC microgrids use power electronic converters to achieve grid-connected and electrical energy transmission. The access of a large number of power electronic converters has a great impact on the stability of the power system.The Virtual Synchronous Generator (VSG) solves the disadvantages of low damping and small inertia of the DC microgrid, but ignores the effects of harmonics on the grid.Firstly, the excitation regulator and power frequency regulator are analyzed to establish a mathematical model; Secondly, the network-side RL filter circuit is designed and the parameters are given. The harmonics of the network before and after the filtering are analyzed and the ideal network is realized. Finally, a simulation model is established in MATLAB, and the correctness of the proposed method is verified by simulation.