基于潮流变化量特征的电网开断故障诊断方法研究

摘要

Traditional diagnosis method of fault power grid based on the action information of pro-tective relays and breakers may have some uncertain factors that have the influence on the accura-cy,such as mal-operation,miss trip in the practical application.A novel method based on con-ventional power flow information of each branch acquired by SCADA was applied to diagnose branch outage fault in this paper.Firstly,branch outage fault pattern sets of the whole power grid were established by branch outage distribution factor.Conventional power flow variations caused by the power grid faults were extracted.Finally,matching recognition for the fault branch was carried out by pattern recognition algorithm.Case study on an actual power system was car-ried out.The results showed that the proposed method could diagnose the outage fault of power system branch rapidly and have application value for engineering.%传统的基于保护、开关动作信息的电网故障诊断方法在实际应用中存在误动和拒动。利用 SCADA 系统采集的电网支路稳态潮流信息作为诊断依据，提出一种电网支路开断故障诊断的新方法，利用支路开断分布因子建立全网支路开断故障模式集，提取电网发生故障后各支路稳态潮流变化量，并运用模式识别算法对电网故障支路进行匹配识别，实现电网开断故障诊断。对某区域电网实例数据进行仿真分析，结果表明：该方法能够有效地对电网支路开断故障进行快速诊断，具有较好的工程实用价值。