Grid-voltage-feedforward active damping for grid-connected inverter with LCL filter

Minghui Lu, Xiongfei Wang, Frede Blaabjerg, S. M. Muyeen, Ahmed Al-Durra, Siyu Leng

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

21 Scopus citations

Abstract

For the grid-connected voltage source inverters, the feedforward scheme of grid voltage is commonly adopted to mitigate the current distortion caused by grid background voltages harmonics. This paper investigates the grid-voltage-feedforward active damping for grid connected inverter with LCL filter. It reveals that proportional feedforward control can not only fulfill the mitigation of grid disturbance, but also offer damping effects on the LCL filter resonance. Digital delays are intrinsic to digital controlled inverters; with these delays, the feedforward control can be equivalent to a damping resistor and a reactance paralleled with filter capacitor. The damping performance in different frequency regions are discussed through Bode diagrams. Compared to other widely used active damping strategies, no extra sensor is needed because the Point of Common Coupling (PCC) voltage is sampled for Phase Locked Loop (PLL). Simulation and experiment results are provided for verifying the theoretical analyses.

Original languageBritish English
Title of host publication2016 IEEE Applied Power Electronics Conference and Exposition, APEC 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1941-1946
Number of pages6
ISBN (Electronic)9781467383936
DOIs
StatePublished - 10 May 2016
Event31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016 - Long Beach, United States
Duration: 20 Mar 201624 Mar 2016

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2016-May

Conference

Conference31st Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2016
Country/TerritoryUnited States
CityLong Beach
Period20/03/1624/03/16

Keywords

  • Digital time delay
  • feedforward
  • grid-connected inverter
  • LCL filter
  • resonance damping

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