On the design of LCL filter with passive damping in three-phase shunt active power filters

摘要: This paper is focused on the LCL filter with damping resistance used to interface shunt active power of an DC-traction substation supply. Two main requirements be met by are emphasized, in terms significant attenuation current switching harmonics and ensuring unalterated flow compensated fitering. The behaviour analysed basis frequency response associated currents-based transfer functions. First, influence passive filter's parameters magnitude pointed out, resulting useful aspects for a proper design. Then, analysis losses shows existance maximal value losses, when at fitering both imposed. Thus, imposion ratio between provides additional condition leading concrete set parameters. It shown that there practical limitations compromise must made two requirements. results Matlab/Simulink-based simulation filtering regime 12-pulse series diode rectifier coupling designed as proposed illustrate good performance system behavior.