Frequency response analysis to select the best PSS locations in power systems

It is well know that the location is a significant factor in the ability of power system stabilizers (PSS) to increase the damping of inter-area oscillations. Generally, two methodologies have been applied by most researchers to identify the best PSS locations. Controllability/observability analysis is derived from modal control theory of linear time-invariant system and participation factor analysis which is used to measure the degree of participation of a state variable in a mode. Beyond modal analysis, in this paper a frequency domain method is used to identify the best PSS location to increase the damping of an inter-area mode. The results obtained by this method are compared with those obtained by conventional methods.