Region-Province Coordinated Load Recovery Optimization Model Considering Large-scale Power Loss

Abstract

When there is a large-scale power loss in the regional power grid, the automatic under-frequency load shedding (UFLS) device acts to control the system frequency, but the recovery after the load resection is still mainly by manual operation, resulting in the low efficiency of load recovery. In view of this problem, based on the power grid hierarchical scheduling, a load recovery optimization model coordinated regional and provincial power grid is constructed. In this model, loads are restored in minutes. During a single time period, power of provincial dispatching units are independently optimized firstly, and then upload unit output data to the regional dispatch center. With provincial unit power information and remaining power shortage, output of regional dispatching units will be optimized then. By constructing provincial and regional load recovery optimization model respectively with information sharing and hierarchical decision-making, the excision load can be restored quickly. Analysis of a regional power grid example proved that with the proposed model, the system reserve capacity is called out quickly and the load recovery time is reduced greatly after UFLS.