Mitigation of Grid-Current Distortion for LCL-Filtered Voltage-Source Inverter with Inverter-Current Feedback Control

Zhen Xin, Paolo Mattavelli, WenLi Yao, Yongheng Yang*, Frede Blaabjerg, Poh Chiang Loh

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

77 Citations (Scopus)
539 Downloads (Pure)

Abstract

LCL filters feature low inductance; thus, the injected grid current from an LCL-filtered Voltage Source Inverter (VSI) can be easily distorted by grid voltage harmonics. This problem is especially tough for the control system with Inverter-side Current Feedback (ICF), since the grid current harmonics can freely flow into the filter capacitor. In this case, because of the loss of harmonic information, traditional harmonic controllers fail to mitigate the grid current distortion. Although this problem may be avoided using the grid voltage feedforward scheme, the required differentiators may cause noise amplification. In light of the above issue, this paper develops a simple method for the ICF control system to mitigate the grid current harmonics without extra sensors. In the proposed method, resonant harmonic controllers and an additional compensation loop are adopted at the same time. The potential instability introduced by the compensation loop can be avoided through a special design of the compensation position. Finally, the effectiveness of the proposed method for harmonic rejection is verified by detailed experimental results.
Original languageEnglish
JournalI E E E Transactions on Power Electronics
Volume33
Issue number7
Pages (from-to)6248-6261
Number of pages14
ISSN0885-8993
DOIs
Publication statusPublished - Jul 2018

Keywords

  • Harmonic suppression
  • Inverter current control
  • Grid-voltage distortion
  • Voltage source inverter (VSI)
  • LCL-filter

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