UDE-Based Controller Equipped with a Multi-Band-Stop Filter to Improve the Voltage Quality of Inverters

Shlomo Yaakov Gadelovits, Qing Chang Zhong, Visakan Kadirkamanathan, Alon Kuperman

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


In this paper, a method to directly shape the output impedance of an inverter is proposed to reduce the total harmonic distortion of the output voltage, based on the uncertainty and disturbance estimator (UDE)-based robust control framework. It is shown that, because of the two-degree-of-freedom feature of the UDE-based control strategy, the UDE filter directly affects the inverter output impedance. A multi-band-stop filter instead of a commonly adopted low-pass filter is then proposed to directly minimize the output impedance around the harmonics to reduce the effect of nonlinear loads and assure robustness to frequency variations. Two tradeoffs are revealed: one between filter bandwidth and stability and the other between robustness and the number of harmonics suppressed. The effectiveness of the proposed control strategy is fully supported by experimental results.

Original languageEnglish
Article number7912410
Pages (from-to)7433-7443
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number9
StatePublished - 1 Sep 2017


  • Filter bank
  • inverters
  • total harmonic distortion (THD)
  • uncertainty and disturbance estimator (UDE)

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering


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