An optimal control strategy for power quality enhancement in a competitive environment

A. Griffo*, G. Carpinelli, D. Lauria, A. Russo

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)


The new electric system restructuring requires more and more restrictive power quality requirements to be satisfied. The problem of disturbances compensation therefore becomes of noticeable importance, both in terms of device allocation and control strategy. The paper deals with active compensators, whose utilization is rapidly growing in modern power system, whereas power electronic devices play a fundamental role in controlling system behavior. An optimal control strategy for active compensators, particularly useful for distribution companies in a deregulated framework, is proposed with the aim of improving power quality. The proposed strategy is based upon a frequency domain approach for solving a linear quadratic regulator problem, without exceeding compensator rating. The proposed procedure is able to properly consider the buses sensitivity to different power quality disturbances. The methodology relies upon a Kalman filter based estimation technique, which enables an accurate tracking of relevant network state variables, as well as of harmonic disturbances injected into the power system. In the last part of the paper a numerical application with reference to a 18-busbar distribution network is presented, showing the feasibility and the effectiveness of the proposed methodology. (c) 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)514-525
Number of pages12
JournalInternational journal of electrical power & energy systems
Issue number7
Publication statusPublished - Sept 2007


  • active filtering
  • power quality
  • optimal control
  • Kalman estimation


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