Research Article Open Access

Design of Robust UPFC Controller Using H Control Theory in Electric Power System

Seyed Abbas Taher, Shahabeddin Akbari, Ali Abdolalipour and Reza Hematti


An industrial plant, such a power system, always contains parametric uncertainties. In the design of a controller the uncertainties have to be considered. Otherwise, if the real plant differs from the assumed plant model, a controller, designed based on classical controller design approaches, may not ensure the stability of the overall system. In this paper design of robust control for the UPFC controllers including power - flow and DC voltage regulator, using a H loop-shaping design via a normalized coprime factorization approach, where loop-shape refers to magnitude of the loop transfer function L = GK as function of frequency is presented. As an example, we have designed a case for the system to compare the proposed method with a conventional method (classical P-I controller). AS the results of the linear and nonlinear simulations, the validity of the proposed method has been confirmed.

American Journal of Applied Sciences
Volume 5 No. 8, 2008, 980-989


Submitted On: 4 October 2007 Published On: 31 August 2008

How to Cite: Taher, S. A., Akbari, S., Abdolalipour, A. & Hematti, R. (2008). Design of Robust UPFC Controller Using H Control Theory in Electric Power System. American Journal of Applied Sciences, 5(8), 980-989.

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  • Unified Power Flow Controller (UPFC)
  • Flexible AC Transmission Systems (FACTS)
  • power system oscillation
  • H loop-shaping