Uncertainty and Disturbance Estimator-Based Controller Equipped with a Time-Delayed Filter to Improve the Voltage Quality of Inverters

Shlomo Y. Gadelovits, Qing Chang Zhong, Visakan Kadirkamanathan, Alon Kuperman

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

In this paper, a two-degrees-of-freedom control structure is proposed to minimize both total harmonic distortion and tracking error of inverter output voltage, adopting a resonant tracking controller and a modified uncertainty and disturbance estimator (UDE). Owing to the two-degrees-of-freedom feature of the proposed control strategy, tracking and disturbance rejection tasks are decoupled and treated almost independently. A time-delay action is introduced into a commonly adopted low-pass UDE filter to minimize the output impedance magnitude around the odd harmonics, which is typical to nonlinear loads. Once the disturbance is properly rejected, a tracking resonant controller is designed to force the output of the nominal system to follow a sinusoidal reference with near-zero amplitude and phase error. The performance of the proposed control structure is fully verified by the experimental results.

Original languageEnglish
Article number8351975
Pages (from-to)459-469
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Volume66
Issue number1
DOIs
StatePublished - 1 Jan 2019

Keywords

  • Inverter
  • resonant control
  • total harmonic distortion (THD)
  • two-degrees-of-freedom control
  • uncertainty and disturbance estimator (UDE)
  • voltage quality

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

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