Comparison of modal controllability between FACTS-based stabilisers and PSS in increasing the oscillation stability of multimachine power systems

The effectiveness of three types of FACTS-based power system stabilisers are compared with the PSS in terms of their modal controllability to the oscillation modes in multimachine power systems. The comparison is focused on two aspects of the damping effect of the stabilisers; first the robustness of the stabilisers to the variations of system parameters and operating conditions and secondly, the influence of the installing location. A sample three-machine power system is presented to demonstrate the analytical conclusions which emerge from the comparison