TY - JOUR AU - Taher, Seyed Abbas AU - Akbari, Shahabeddin AU - Abdolalipour, Ali AU - Hematti, Reza PY - 2008 TI - Design of Robust UPFC Controller Using H∞ Control Theory in Electric Power System JF - American Journal of Applied Sciences VL - 5 IS - 8 DO - 10.3844/ajassp.2008.980.989 UR - https://thescipub.com/abstract/ajassp.2008.980.989 AB - 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.