An Approach to Determine the Optimal Location ofThyristor-controlled Phase Shifting Transformer toImprove Transient Stability in Electric Power System

This paper presents an approach to determine theoptimal location of thyristor-controlled phase shiftingtransformer (TCPST) for enhancing the transient stability ofpower system. TCPSTs are a cost-effective means to ensurereliable andefficient power flow control in overloadedtransmission lines. This feature leads toreduction of the rotorangle separation of synchronous generators during disturbance occurrence which, results in an improvement of transientstability of network. To select the optimal location of TCPST,the angular separation of the rotors of generators in differentpositions of TCPST installation was calculated. Implementationof the proposed method on WSCC 9-bus and New England 39-bus test system shows the good efficiency of this method forimproving transient stability. The results show that installationof TCPST in proper possessiondecreases the angular separationof the rotors of generators, which effectively improves thesystem’s transient stability