Coordination and Optimization Control for Stable Load Shedding Control and Dynamic Zoning of Power Grid

For the steady under voltage problem of the system, currently, measures such as switching on/off capacitors and reactors, adjusting transformer taps, etc. are generally taken to make the voltage rise firstly. When the control measures are insufficient, it is necessary to cut off some of the load. Considering that when the local steady under voltage level of the system is above 0.8 p.u, the control time requirement is not high, it is proposed to use dynamic zoning technology to coordinate with load shedding control and improve the refinement level of load shedding control. The impact evaluation indicators for dynamic zoning and the comprehensive cost indicators for load shedding are defined, and the direct search method of rotating variables is adopted to reduce the complexity of optimization search. Firstly, a zoning scheme is determined, and based on the control sensitivity index of the load, available load shedding points are selected. Furthermore, based on the evaluation results of load shedding priority, load shedding points are selected sequentially, and the minimum comprehensive control cost under this zoning scheme is calculated. Finally, by rotating the zoning points sequentially and iterating continuously, the optimal comprehensive control strategy is obtained. The effectiveness of this method in reducing load shedding and comprehensive control costs has been verified based on actual power grid examples.