Evaluation of load shedding to prevent dynamic voltage instability based on extended fuzzy reasoning

Abstract

A reliable load-shedding approach, which makes use of a knowledge base and extended fuzzy reasoning, is proposed to arrest dynamic voltage insecurity following a disturbance. Irrespective of the nature of the dynamic voltage instability, the location and required amount of load shedding among load control buses can be promptly presented in real-time to the system operators. In the development of this scheme, fuzzy indicators for all load control buses are firstly established and then correlated with the real load-shedding amounts decided during the off-line simulation study. The load-shedding amount for previously unseen operating cases at each load control bus can be conservatively predicted according to the zone within which the fuzzy indicator falls.