LCL Filter Design with the consideration of Fault Current Minimization in Mode Transfer of a Grid Connected Type PCS

계통 연계형 PCS의 운전모드 전환시 사고전류 최소화를 고려한 LCL 필터 설계

A new LCL filter design of a PCS with the consideration of fault current minimization is proposed. The magnitude of fault current is analysed with the variation of inverter side $L_i$, line side $L_u$, and filter capacitor $C_f$ under constant line side $THD_i$ of 5%. It is found that inverter side fault current reaches up to 200%~660% of the rated current with the variation of $L_i$. It is expected that the results can be applied to the detailed design of PCS filter.