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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 747641, 9 pages
http://dx.doi.org/10.1155/2013/747641
Research Article

Nonlinear Robust Disturbance Attenuation Control Design for Static Var Compensator in Power System

Faculty of Information Science and Engineering, Northeastern University, Box 135 Shenyang, Liaoning 110819, China

Received 23 August 2013; Accepted 28 October 2013

Academic Editor: Baoyong Zhang

Copyright © 2013 Ting Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The problem of designing an adaptive backstepping controller for nonlinear static var compensator (SVC) system is addressed adopting two perspectives. First, instead of artificially assuming an upper bound or inequality scaling, the minimax theory is used to treat the external unknown disturbances. The system is insensitive to effects of large disturbances due to taking into account the worst case disturbance. Second, a parameter projection mechanism is introduced in adaptive control to force the parameter estimate within a prior specified interval. The proposed controller handles the nonlinear parameterization without compromising control smoothness and at the same time the parameter estimate speed is improved and the robustness of system is strengthened. Considering the short-circuit ground fault and mechanical power perturbation, a simulation study is carried out. The results show the effectiveness of the proposed control method.