Abstract
This paper presents a case study of inter-area oscillation damping enhancement in the Western US Power System (WSCC) by a thyristor controlled series capacitor (TCSC). First, siting of the TCSC is investigated, and then a robust damping controller, i.e. a controller that operates at various loading conditions, is designed. The proposed methodologies are based on transfer function residues. An index is given to identify the most effective signal to feedback, and a condition to guarantee control robustness is derived based on the phases of the residues. A reduced order model of the WSCC system is used to demonstrate the proposed techniques Specifically, a TCSC is recommended to dampen the WSCC near 0.7 Hz inter area modes.
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