Abstract
Based on equivalent model of power network and voltage stability index, a centralized load shedding strategy is developed for voltage stability control in this paper. Utilizing the sensitivity of voltage instability index to load power obtained from the equivalent model, the control location is decided with considering on control capability and effectiveness of load comprehensively, and the amount of the load to be shed is calculated by solving an optimization problem. Finally, a centralized load shedding algorithm and its implementation scheme is proposed to prevent voltage instability by cooperating with on-line voltage stability monitoring. Simulations conducted on typical power systems indicate that the load shedding scheme can keep voltage stability margin and voltage level effectively to prevent deterioration of power system. More, the load control algorithm adapts to on-line voltage stability control.
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