基于拓扑建模的电网故障诊断优化模型

Topological Modeling Based Optimal Model for Power Grids Fault Diagnosis

电网发生故障后,故障元件的快速准确识别是进行故障精确定位乃至系统恢复的首要前提。针对现有电网故障诊断优化模型建模过程繁杂,网络适应性差的问题,提出一种基于拓扑建模的电网故障诊断优化模型。从电网拓扑结构出发,形成系统各元件、保护和断路器的拓扑描述,并根据保护系统的配合逻辑及出口方式,对系统的拓扑信息进行深入挖掘,从整体上对各类保护及断路器的期望状态进行建模,在此基础上综合保护系统动作逻辑错误和信息通信错误对目标函数进行改进,实现优化模型的自动高效建模。算例仿真表明,所提拓扑建模方法能够降低错误告警信息的影响,快速判定故障元件,具有较强的容错性。

When fault occurs in power system, fault element diagnosis is the first prerequisite for fault location and system recovery. Since the traditional optimal model for power system fault diagnosis is complex and hard to adapt to topology change. In this paper, a topology modeling based optimal model is proposed. Based on the power grid structure, the topology description of the element, protection and circuit breaker is formed. According to the cooperation logic and outlet of the protection, the topology information of the system is deeply excavated, thus to get the analysis expression of expect state of the protective devices. Besides, the objective function is improved by both considering the logical error and information error, and therefore the optimal model can be established automatically. The simulation results of the testing system show that the proposed method can minimize the influence of error alarms, and determine the faulty elements with strong fault tolerance.