Investigation of UPFC performance under system uncertainties

This paper presents a systematic robustness analysis of unified power flow controller (UPFC) under system parametric uncertainties. The power system uncertainties are considered as different loading conditions. In order to deal with these uncertainties, robust control methods are handled to design UPFC controllers. The well known robust methods such as quantitative feedback theory (QFT) and mu-synthesis are carried out to design UPFC controller. Two test cases as single machine and multi machine are incorporated to evaluate the proposed methods. Also, the proposed methods are compared with conventional controller. The simulation results denote the ability and effectiveness of the proposed methods for tackle with uncertainties. (C) 2012 Elsevier Ltd. All rights reserved.