Disturbance-Observer Based control for PWM Rectifiers Under Unbalanced Grid Conditions

Mohammed Al Razehi, Rachid Errouissi, Mahdi Debouza, Hussain Shareef

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper presents the design and experimental validation of a current control technique for Pulse-width modulated (PWM) rectifiers under both balanced and unbalanced grid voltages. In particular, unbalanced grid voltages can cause double fundamental frequency oscillations in the DC-link voltage. These DC-link voltage oscillations can be removed by setting the grid current to accurately track a specific current reference. In this paper, the proposed controller utilizes a cascaded control scheme comprising of an outer voltage loop and an inner current loop. The outer loop controller is designed to generate the specific current reference needed to maintain the DC-link voltage constant and at its reference. The inner current loop consists of a state-feedback controller coupled with a disturbance observer to ensure accurate tracking of the current reference. The current controller is designed in the αβ reference to ensure accurate regulation of both balanced and unbalanced grid currents needed to suppress the DC-link voltage oscillations. To validate the effectiveness of the proposed controller, experimental tests were conducted and showcased that the control scheme is able to achieve the desired control objectives with excellent results.

Original languageEnglish
Title of host publication2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages39-44
Number of pages6
ISBN (Electronic)9781665456005
DOIs
Publication statusPublished - 2022
Event2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022 - Ras Al Khaimah, United Arab Emirates
Duration: Nov 23 2022Nov 25 2022

Publication series

Name2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022

Conference

Conference2022 International Conference on Electrical and Computing Technologies and Applications, ICECTA 2022
Country/TerritoryUnited Arab Emirates
CityRas Al Khaimah
Period11/23/2211/25/22

Keywords

  • Disturbance observer
  • PWM rectifier
  • feedback linearization
  • sinusoidal disturbance rejection
  • unbalanced grid voltages

ASJC Scopus subject areas

  • Artificial Intelligence
  • Computer Networks and Communications
  • Computer Science Applications
  • Signal Processing
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Safety, Risk, Reliability and Quality
  • Control and Optimization

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