Research on Comprehensive Evaluation Method of Network Reconfiguration Considering Power Flow Over-limit

Abstract

Considering the problems of restoration grid optimization insufficient and low stability of post disaster restoration in the process of existing power system multi circuit line network reconfiguration, firstly this paper searches for the set of shunt transmission paths to effectively reduce the risk of power flow over-limit in line restoration process, Considering the problem that the close angle of shunt line is too large during grid connection and loop closing, a sensitivity analysis method considering node phase angle is proposed. Based on load importance and sensitivity sequence, combined with line recovery sequence, a load and unit recovery strategy is formulated, Finally, based on the influence factors such as power flow over-limit reduction effect, close angle regulation effect, system operation reliability and recovery process complexity, a comprehensive evaluation method for network reconfiguration considering power flow over-limit is formed. Combining the above evaluation methods, the optimal recovery path set and network recovery strategy are selected to ensure the stability of system operation in the recovery process. The IEEE 39 bus system example discusses the solution to the problem of power flow over-limit and excessive close angle in loop closing and parallel operation, which verifies the necessity of considering power flow over-limit line network reconfiguration and its effectiveness of the comprehensive evaluation method.