Comparative analysis of Vague Controller and fuzzy controller for single machine infinite bus system

In this paper, a Vague Set Based Controller Power System Stabilizer (VCPSS) has been evaluated on a single machine infinite bus power system. This VCPSS is capable of providing appropriate stabilization signals over a broad range of operating conditions and disturbances. A Vague Controller (VC) is synthesized by using the notion of vague sets, which are a generalization of fuzzy sets and synonyms of the interval type fuzzy set. In the proposed vague expert system, speed deviation and its derivative have been selected as vague inputs. Simulation results show the superiority and robustness of vague controller power system stabilizer as compare to conventionally tuned controller and fuzzy logic controller to enhance system dynamic performance over a wide range of operating conditions.