Analysis and design of LCL filter with passive damping circuits for three-phase grid-connected inverters

In this paper, a design method of LCL and a generalized model with various types of passive damping circuits for the three-phase grid-connected inverter are proposed. Based on the generalized model, theoretical analysis is carried out to examine the performance of the designed LCL filter. The validity of the proposed filter model is verified by simulation and experimental results.