Probability based control signal selection for inter area oscillations damping using TCSC

The residue analysis is primary basis for signal selection for damping the inter area oscillations employing flexible AC transmission system (FACTS) controller. The control signals should be selected to get the best residue possible under a large number of operating conditions. This ensures a high modal controllability and modal observability of the selected modes to be damped. The present work analyzes the variation of residues corresponding to different control signals for various operating conditions. A probabilistic approach is proposed to select the best control signal for the TCSC controllers, suitable for the majority of operating conditions. The results are presented using simulation studies in the NETS-NYPS test system.