Security Level Partition Method and Coordinated Optimization Strategy After Power Loss

Abstract

The failure of the contact line at the ultra-high voltage connected grid may cause severe large-scale power loss. In order to solve the power rebalancing problem and minimize the impact after failure, a coordinated scheduling strategy was proposed in this paper. Firstly, according to the system operation mode, the system security level is divided based on the missing power. And according to the security level of the system, the scope of coordination and the starting conditions after failure occurs of the integrated scheduling were determined. And then, an integrated coordination optimization method based on generalized contact line plan is proposed. Finally, the intraday rolling schedule of the provincial and region generator units is conducted respectively. The results of simulation and analysis show that the proposed method can accurately divide the influence scope levels according to power loss, and the power balance can be recovered quickly through the corresponding intraday coordination scheduling without amounts of adjustments.