Performance comparison of passive series R and shunt R-C damped LCL filter for grid-connected inverters

Performance comparison of passive series R and shunt R-C damped LCL filter for grid-connected inverters

Blog Article

LCL filters are widely used in distributed power-generation systems to attenuate high-frequency harmonics caused by pulse-width modulation switching of grid-connected inverters.A resonance occurs due to the series-connected reactive components.In order to damp resonance effects, active and passive damping methods are used.

Lower switching frequencies are typically preferred to decrease switching power losses with high-power applications.Thus, control bandwidth of Clearance the system is limited and implementation of active damping gets harder.As a result, passive damping methods are commonly Sprays used in high-power applications.

In this study, performances of two most commonly used passive damping methods which are series R damped and shunt R-C damped are analysed and compared in terms of resonance damping, grid current attenuation at high frequencies, and power losses on damping circuits.