Effects of load characteristics on the damping performance of Power System Stabilizers for inter-area oscillations

Load characteristics are known to have an effect on the performance of a Power system stabilizer (PSS) while damping inter-area oscillation. In this paper, conventional and wide area control system (WACS) based PSS designs are comparatively assessed. The conventional PSS utilizes local rotor speed as its input whereas the WACS-based PSS can use both local and remote generator rotor speeds. From existing publications, the damping effectiveness of conventional PSS has been reported to vary with respect to different load characteristics. This paper evaluates the damping effectiveness of potential WACS-based PSS under different load characteristics. Simulations are conducted using different load models and load magnitudes on a two area network. Results are compared to conventional PSS oscillation damping.