A fuzzy logic-based adaptive power system stabilizer for multi-machine systems

This paper presents an approach for designing fuzzy logic based adaptive power system stabilizers for multi-machine power systems. The approach is based on the traditional frequency domain method. In addition, a fuzzy signal synthesizer is introduced to achieve adaptiveness. In this approach, two linear stabilizers are designed to accommodate two extreme loading cases. A fuzzy logic mechanism is used to generate one single control signal by properly combining the outputs of the linear stabilizers. The fuzzy controller is optimized using a least squares error criterion. Simulation studies of a one-machine infinite-bus and a multi-machine system show that the proposed stabilizer provides satisfactory damping against low frequency oscillations under different operating conditions.