A Novel RC-ESO-ADRC for Harmonics Suppression and Robustness Improvement of Grid-Tied Inverters in a Weak and Distorted Grid

Qiangsong Zhao*, Qifan Wang, Hongwei Zhang, Yuanqing Xia, Yongqiang Ye

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Repetitive control-based extended state observer (RC-ESO) enhances the estimation accuracy of periodic harmonic disturbances. However, it exhibits a slow convergence rate of disturbance estimation, limited steady-state estimation accuracy, and a lack of systematic design. An improved active disturbance rejection control (ADRC) current control scheme based on a novel RC-ESO (NRC-ESO) is proposed in this article. An ideal compensation filter is used to design the NRC-ESO, achieving a faster convergence rate for disturbance estimation. In addition, a zero-phase low-pass filter is embedded in the NRC-ESO to reduce the current steady-state error and mitigate the impact of sensors high-frequency noise. The antidisturbance ability, tracking performance, system stability, and detail parameter optimization design of the NRC-ESO-based ADRC (NRC-ESO-ADRC) are presented. The experimental results reflect the effectiveness of current harmonics suppression and robustness.

Original languageEnglish
Pages (from-to)12581-12593
Number of pages13
JournalIEEE Transactions on Power Electronics
Volume40
Issue number9
DOIs
Publication statusPublished - 2025
Externally publishedYes

Keywords

  • Active disturbance rejection control (ADRC)
  • current harmonics
  • extended state observer (ESO)
  • grid-tied inverter
  • repetitive control (RC)

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