Abstract
Power system load change and transmition line change occur frequently. System state change in any form is no doubt the major issue in power system stabilization. Controller design of thyristor controlled series capacitor (TCSC) can be formulated as a robust control problem.
In this paper, a design approach of TCSC controller is formulated. The approach is based on detail analysis of dynamic characters and practical requirements (stability margin, sensitivity, disturbance attenuation etc.) of power system. Make use of mixed-sensitivity method of H∞ control theory, a practical controller design is proposed. A design method for weighting functions (W1, W-12, W-13) is developed. It consists of design foundation and design steps. An effective TCSC controller is presented. With this designed controller, the power system can be stabilized in larger state fluctuation. Comparing with PID controller, this controller has stronger robust stability and disturbance attenuation. Simulation results show that the proposed design approach is correct and effective.
