Analysis of the thyristor-controlled phase shifter and series compensator in suppressing power system low-frequency oscillations

The extended Phillips-Heffron model of general multi-machine power systems installed with TCP-or TCSC-based stabilizer was established. On the basis of the model, the principle of the TCPS-or TCSC-based stabilizer in damping power system oscillations was investigated in terms of its damping torque contribution to the power systems. The robustness of the TCPS-and TCSC-based stabilizer to the variations of power system operating condition was discussed for the single-machine infinite-bus power system. The indexes to select the best location of installing the TCPS-or TCSC-based stabilizer in the multi-machine power systems were presented.