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

Temiz H., Demirok E., KEYSAN O., Turkay A., Cetinkaya B.

JOURNAL OF ENGINEERING-JOE, no.18, pp.4698-4702, 2019 (ESCI) identifier

  • Publication Type: Article / Article
  • Volume: Issue: 18
  • Publication Date: 2019
  • Doi Number: 10.1049/joe.2018.9321
  • Journal Indexes: Emerging Sources Citation Index (ESCI)
  • Page Numbers: pp.4698-4702
  • Keywords: invertors, power filters, distributed power generation, damping, power grids, performance comparison, passive series R, grid-connected inverters, distributed power-generation systems, high-frequency harmonics, pulse-width modulation, series-connected reactive components, resonance effects, passive damping methods, lower switching frequencies, switching power losses, high-power applications, active damping, resonance damping, grid current attenuation, high frequencies, damping circuits, shunt R-C damped LCL filter, DESIGN
  • Middle East Technical University Affiliated: Yes


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 the system is limited and implementation of active damping gets harder. As a result, passive damping methods are commonly 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.