A fuzzy logic-based adaptive damping controller for static VAR compensator

摘要

This paper presents an approach for designing a fuzzy logic-based adaptive SVC damping controller for damping low frequency power oscillations. The proposed approach uses linear optimal controllers and, in addition, a fuzzy signal tuner is introduced to achieve adaptiveness. Two linear damping controllers are designed to accommodate two extreme operating conditions and a fuzzy logic mechanism is used to generate one single control signal by properly combining the outputs of the linear controllers. The fuzzy controller is optimized using a least squares error criterion and, as a result, a higher-order adaptive controller is achieved. Simulation studies of the proposed fuzzy adaptive damping controller show that it provides satisfactory damping against low frequency oscillations under different operating conditions. Results are given for a one-machine infinite-bus and a four-machine two-area test system, which show improvement over the use of a fixed parameter controller.