Mitigating High-Frequency Resonance in MMC-HVDC Systems Using Adaptive Notch Filters

Jiufang Man, Lei Chen, Vladimir Terzija, Xiaorong Xie

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, high-frequency resonance (HFR) incidents have occurred in several MMC-HVDC projects. The resonance frequency highly depends on system conditions, making mitigation methods designed for specific scenarios ineffective once the grid condition changes. To address the issue, this paper proposes a novel HFR mitigation method based on adaptive notch filters (ANFs). The embedding positions of ANFs in the MMC control are optimally determined through impedance-based analysis. With the HFR frequency estimated by the interpolated discrete Fourier transform, the parameters of ANFs are adaptively tuned. The ANFs improve the damping performance of the captured HFR mode without affecting the dynamic characteristics at other frequencies. As a result, the HFR under varying grid conditions can be mitigated effectively. The effectiveness of the proposed method is verified through electromagnetic transient (EMT) simulations of an actual MMC-HVDC system.

Original languageEnglish
JournalIEEE Transactions on Power Systems
DOIs
Publication statusPublished - 2021

Keywords

  • Adaptive notch filters
  • Bandwidth
  • Damping
  • Frequency control
  • high-frequency resonance
  • Impedance
  • mitigation method
  • modular multilevel converter
  • Notch filters
  • Power harmonic filters
  • Resonant frequency

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