The integration of energy storage into flexible AC transmission systems (FACTS) devices leads to increased controller flexibility by providing decentralized active power capabilities. Combined FACTS/energy storage systems (ESS) can improve power flow control, oscillation damping, and voltage control. This article presents performance indices that have been developed for quantifying the active power, reactive power, and voltage performance enhancement of different FACTS combinations. The dynamic responses of a shunt (StatCom), a StatCom/battery energy storage system (BESS), a synchronous series compensator (SSSC), a SSSC/BESS, and a unified power flow controller (UPFC) are presented to support the validity of the developed indices.

In this paper, STATCOM with battery energy storage system (BESS) is proposed for smoothing intermittent power output of a large wind farm. The main advantage of the system is that it can inject both real power (by charging/discharging the BESS) and the reactive power to the system. Simulations based on an actual wind farm data indicate that indeed with the proposed control strategy the power output of the wind farm can be smoothed to facilitate 1/2h dispatching of the wind farm. Also, the reactive power compensation provided by the STATCOM helps to smooth out the fast voltage variations at the interconnecting bus.

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