An intelligent voltage controller for static VAr compensators

The paper presents a novel AI-rule based intelligent controller for a fixed capacitor-thyristor controlled reactor (FC-TCR) static VAr compensator (SVC). The intelligent voltage regulator is based on the concept of the error excursion plane where the stabilizing action is scaled by the magnitude of the excursion voltage error vector, in order to ensure adequate compensation. The proposed rule based voltage regulator is validated using ATP/EMTP and is compared with an optimized conventional proportional plus integral voltage controller. The proposed rule based design is robust and tolerates system parameter variations as well as modelling inaccuracies, since the control level is only scaled by the location of the voltage excursion error vector in the (e_v -e˙_v) error plane. The scheme is validated for two large system contingencies comprising load rejection and a three phase short circuit fault followed by loss of a transmission line