An on-line fuzzy logic system for voltage/VAr control and alarm processing

The paper describes the development of an online fuzzy logic tool capable of controlling the system voltages and VAr resources, as well as processing alarms related to voltage stability. The fuzzy controller monitors system voltages and system VAr resources and generates appropriate control signals to each VAr source in the system to maintain acceptable system voltage levels. The fuzzy alarm processor generates an individual alarm for each voltage region, and a general alarm signal that indicates the overall system condition. The controller/processor has been designed as an on-line, real time tool. The paper presents a prototype fuzzy controller/processor that has been completely designed, programmed, and tested for a four-generator test system. It has been interfaced with power system simulation software to test its performance under on-line conditions.