Harmonic Analysis and Mitigation of Low-Frequency Switching Voltage Source Inverter with Auxiliary VSI

Haofeng Bai, Xiongfei Wang, Frede Blaabjerg, Poh Chiang Loh

Research output: Contribution to journalJournal articleResearchpeer-review

23 Citations (Scopus)
318 Downloads (Pure)

Abstract

The output currents of high-power Voltage Source Inverters (VSIs) are distorted by the switching harmonics and the background harmonics in the grid voltage. This paper presents an active harmonic filtering scheme for high-power, low-frequency switching VSIs with an additional auxiliary VSI. In the approach, the auxiliary low-power, high-frequency switching VSI is used to compensate both the switching harmonics of the high-power VSI and the low-order harmonics introduced by the distorted grid voltage. Impedance modeling and analysis are implemented for the hybrid VSI system, where the impacts of the grid impedance are analyzed. Different control targets are then formulated based on the analysis, and the corresponding control strategies are proposed. Lastly, simulations and experimental results are provided to validate the theoretical analysis and the performance of the proposed control strategy.
Original languageEnglish
Article number8249540
JournalI E E E Journal of Emerging and Selected Topics in Power Electronics
Volume6
Issue number3
Pages (from-to)1355-1365
Number of pages11
ISSN2168-6777
DOIs
Publication statusPublished - 1 Sept 2018

Keywords

  • Voltage source inverter
  • LC filtered VSI
  • Impedance model

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