Zhongfu Zhou, Tai C. Yang, Paul M. Holland, Richard P. Lewis, and Petar Igic
Power system stabilizer, robust design, multi-machines, pole assignment
A robust design of power system stabilizers using an optimal algorithm for multi-machine power systems is presented in this paper. Based on the proposed method the widely applied conventional power system stabilizers (CPSS) in a multi-machine system is designed in two stages. In the first stage, the time constants of CPSSs are tuned using the physical concept based phase compensation technique based on the frequency response of the GEP(s). In the second stage, the gains of the CPSSs are simultaneously tuned by converting it to an optimization problem which is solved simultaneously by solving a special form of robust pole assignment problem using a constrained optimal algorithm. The effectiveness of the proposed two-stage method in damping local and inter-area modes of oscillations over wide range operating conditions for a four-machine power system is confirmed through eigenvalue analysis and time domain simulation results.
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