Parameter optimization design and performance analysis of filter-integrated switched boost grid-connected inverter

This paper proposes a filter-integrated switched boost grid-connected inverter by coupling switched boost network between inverter bridge and power grid, which can effectively solve the inherent resonance peak problem of LCL filter. Meanwhile, the proposed topology can realize boost function at AC side, which can effectively avoid the problem of excessive voltage stress caused by the boost at the DC side. Due to the design of the parameters in the control system will affect the effect of resonance spike damping, it will also affect the harmonic content of the grid-connected current. Based on the stability margin and steady-state error of the system, combined with the characteristics of the system regulator, the parameter selection area that meets the system requirements is drawn in this paper, and the optimization of the system parameter design method is realized. Finally, the function of the circuit is verified by building an experimental platform.