Optimal load shedding scheme under contingency condition considering voltage stability problem

Rapidly increasing demands in power systems at present may cause overloading of power system equipment. In some situations, these overloading lead to severe blackout unless proper load shedding is performed in time. The load shedding scheme must be effective and optimal in order to protect the power system from voltage instability. This paper proposes a new load shedding scheme under contingency condition considering voltage stability problem. The proposed method is based on the linearized optimization method. Moreover, rather than considering load as a constant power demand, more accurate model is used. The proposed method has been tested with the EGAT Thailand system. Satisfactory results have been obtained.