Coordinated design of excitation and TCSC-based stabilizers for multimachine power system

In this paper, the coordinated operation of conventional power system stabilizer (CPSS) and thyristor controlled series capacitor (TCSC) is studied. The analysis of mode controllability is used to select the effective location for TCSC. The performance of TCSC equipped with a phase lead-lag controller is investigated. The controllers design problem is formulated as an optimization problem. The genetic algorithm (GA) is used to search for optimal settings of controller parameters. A coordinated control scheme is applied to a three machine nine bus power system. The proposed control scheme is tested under different loading conditions and analysis reveals that the coordinated control of CPSS and TCSC equipped with lead-lag controller gives better dynamic performances as compared to with only CPSSs.