Linear complexity search algorithm to locate shunt and series compensation for enhancing voltage stability

Shunt and series reactive power compensation are two effective ways to increase the voltage stability margin of power systems. This paper proposes a methodology of locating switched shunt and series capacitors to endow them with the capability of being reconfigured to a secure configuration under a set of prescribed contingencies. Optimal locations of new switch controls are obtained by the forward/backward search on a graph representing discrete configuration of switches. A modified WSCC 9-bus system is adopted to illustrate the effectiveness of the proposed method.