Evaluation of transient stability margin of a power system containing multiple FACTS devices

− This paper discusses the effect of simultaneous use of one shunt and one series FACTS device on the transient stability condition of a power system. The devices used are thyristor controlled series compensator (TCSC) and static synchronous compensator (STATCOM). The transient stability condition is assessed using trajectory sensitivity analysis (TSA). The TCSC is modeled by a variable capacitor, the value of which changes with the firing angle. The STATCOM is modeled by a voltage source connected to the system through a transformer. The system used for the analysis is the WSCC 3-machine, 9-bus system. It is shown that TSA can be used to determine the optimal locations and suitable operating conditions of the two devices for transient stability improvement. Index Terms − STATCOM, TCSC, Trajectory sensitivity analysis, Transient stability margin, optimal location.

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