Optimal Fuzzy Inference System incorporated with stability index tracing: An application for effective load shedding

•Stability index tracing technique has been proposed for precise load shedding.•Two fuzzy systems using intuitive and optimization approach were proposed.•The proposed technique provide consistent voltage stability enhancement.•The proposed technique is reliable and robust for voltage collapse prevention.

The application of fuzzy logic as a decision maker has been widely implemented for solving various engineering problems, especially in the field of voltage stability improvement. Because of this sophisticated tool is very suitable for non-linear system and easy for implementation, many researchers have taken initiative to formulate it according to their point of view. In the meantime, the electricity tracing techniques have also been developed through various theories, nevertheless, only transmission service pricing and electricity deregulation become the subjects of discussion when implementing it. In virtue of that, this paper proposes a new technique for locating the suitable load buses for the purpose of load shedding considering multi-contingencies, that is, by means of stability index tracing. The amount of load power to be shed is determined via a modified version of fuzzy system, which consists of improved membership functions by optimization algorithm. Experiment on IEEE 57-bus and 118-bus reliability test systems (RTS) validates the feasibility of the proposed technique for real system application.