Avoiding Risk of Voltage Instability in a Power System through Reactive Power Rescheduling and Load Shedding

Abstract This article describes a procedure for improving voltage stability condition of a power system by reactive power rescheduling or load shedding. For this purpose, a voltage stability index and its threshold value is used as the basis. Sensitivity factors are derived to relate change in voltage stability index for changes in reactive power at generation buses and changes in load at load buses. Using these sensitivity factors, a procedure is proposed for avoiding risk of voltage instability in a power system by applying reactive power rescheduling or load shedding.