University of Hertfordshire

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Multivariable control of a grid-connected wind energy conversion system with power quality enhancement

Research output: Contribution to journalArticlepeer-review


  • Fouad Kaddour
  • Houari Merabet Boulouiha
  • Ahmed Allali
  • Ali Tabti
  • Mouloud Denai
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Original languageEnglish
Pages (from-to)25-57
Number of pages33
JournalEnergy Systems
Early online date5 Oct 2016
Publication statusPublished - 1 Feb 2018


This paper proposes the design of a multivariable robust control strategy for a variable-speed WECS based on a SCIG. Optimal speed control of the SCIG is achieved by a conventional PI controller combined with a MPPT strategy. DTC-SVM technique based on a simple Clarke transformation is used to control the generator-side three-level converter in the variable speed WECS. The flow of real and reactive power between the inverter and the grid is controlled via the grid real and reactive currents and the DC link voltage using multivariable H∞ control. The overall WECS and control scheme are developed in Matlab/Simulink and the performance of the proposed control strategy is evaluated via a set of simulation scenarios replicating various operating conditions of the WECS such as variable wind speed and asymmetric single grid faults. The power quality of the WECS system under H∞ control control approach is assessed and the results show a significant improvement in the total harmonic distorsion as compared to that achieved with a classical PI control.


This document is the Accepted Manuscript version of the following article: Kaddour Fouad, Houari Merabet Boulouiha, Ahmed Allali, Ali Taibi, and Mouloud Denai, ‘Multivariable control of a grid-connected wind energy conversion system with power quality enhancement’, Energy Systems, Vol. 9 (1): 25-57, February 2018. The final publication is available at Springer via:

ID: 13604268