In AC power systems, for many years to overcome the reactive power problems mechanical switched groups of capacitors and reactors are used. However, to control the switching of power capacitor and reactors has been a major challenge for engineers. Because during transient events such elements cannot provide the necessary compensation because of their slow response times and can really degraded the stability of the system after disturbance influences [2]. In power systems it was observed that compensation with the case of the semiconductor switches, the voltage crashes could be prevented and the transient and dynamic stability could be improved [3]. FACTS controllers are fast against traditional equipment because of their power electronic based structure and they increase the stability operating limits of the transmission systems when their controllers are properly tuned [4].
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