Detailed analysis and a general design procedure of damped LCL filters in three phase voltage source converters

Detailed analysis and the parameter design of damped LCL filters applied in three phase voltage source converters is carried out in this work. Relations between the LCL filter parameters (L
1
, L
2
, C and R) and the corresponding transfer function parameters, including ω
s
, ω
c
, ω
z
and ω
R
, are investigated mathematically and demonstrated explicitly. Based on this methodology, a reasonable and optimal design procedure is proposed. Simulation results are provided to validate the performance of the LCL filter and the design procedure.