Improving the Reactive Current Compensation Capability of Cascaded H-Bridge Based STATCOM under Unbalanced Grid Voltage

Yousef Neyshabouri, Sanjay K. Chaudhary, Remus Teodorescu, Rahman Sajadi, Hossein Iman_Eini

Research output: Contribution to journalJournal articleResearchpeer-review

1 Citation (Scopus)

Abstract

This paper deals with the operation of a cascaded H-bridge (CHB) converter-based STATCOM under unbalanced grid conditions. Degrees of freedom and operational limitations of the CHB STATCOM during unbalanced grid condition are analyzed according to the converter power flow equations. Based on this analysis, an improved low-voltage ride-Through (LVRT) strategy for the CHB STATCOM is proposed. In this strategy, the grid operator can control both the positive-and negative-sequence reactive currents independently within the operation range of the CHB STATCOM. In addition, to keep the submodules' capacitors voltages balanced, a zero-sequence voltage term is injected to the converter legs. The negative-sequence active current is also controlled to limit the injected zero-sequence voltage and keep the converter within the rated operation range. The performance and effectiveness of the proposed method are validated through PSCAD/EMTDC simulation of a 21-level CHB STATCOM. The results are experimentally demonstrated on a 9-level CHB STATCOM prototype.

Original languageEnglish
Article number8714053
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
Volume8
Issue number2
Pages (from-to)1466-1476
Number of pages11
ISSN2168-6777
DOIs
Publication statusPublished - Jun 2020

Keywords

  • Cascaded H-bridge Converter (CHB)
  • Low-Voltage Ride Through (LVRT)
  • STATCOM

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