Abstract

The under voltage load shedding (UVLS) is an effective measure to prevent voltage collapse in power systems. The voltage stability varies with the system operation conditions and the under voltage load shedding strategies need to be adjusted in real time. In this paper, a strategy formulation method of UVLS is presented based on the on-line voltage stability indicator. First, the minimum singular value of the load flow Jacobian matrix is selected as the on-line voltage stability indicator. Then, the sensitivity of minimum singular with load is used to select the locations of load shedding in the premise of guaranteeing important load. Moreover, the Particle Swarm Optimization (PSO) is applied to determine the amount of load to be shed. Finally, the strategy of centralized under voltage load shedding is made. The simulation results of the New England 10-machine 39-bus system indicate that the system can be restored the voltage stability with the minimum amount of load shedding.

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