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Mathematical Problems in Engineering
Volume 2015, Article ID 510216, 9 pages
http://dx.doi.org/10.1155/2015/510216
Research Article

Wide-Area Robust Decentralized Coordinated Control of HVDC Power System Based on Polytopic System Theory

1China Electric Power Research Institute, Beijing 100192, China
2Renmin University of China, Beijing 100872, China

Received 9 January 2015; Accepted 10 March 2015

Academic Editor: Xinggang Yan

Copyright © 2015 Shiyun Xu 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 present study proposes a hierarchical wide-area decentralized coordinated control framework for HVDC power system that is robust to multiple operating conditions. The upper level wide-area coordinated controller is designed in the form of dynamic output feedback control that coordinates the lower level HVDC supplementary controller, PSS, and SVC. In order to enhance the robustness of the designed controller under various operating conditions, the polytopic model is introduced such that the closed-loop control system can be operated under strong damping mode in virtue of the stability criterion based on damping ratio. Simulation results demonstrate that the proposed controller design algorithm is capable of enhancing the system damping over four different conditions.