融合遥信报警和电气量分析的电网故障诊断方法

摘要

With widespread application of wide area measurement systems and fault recording networks to power sys -tems, the electrical measurements can be obtained more conveniently and reliably .This paper used a comprehensive fault diagnosis method based on switching -status alarms and electrical measurements .First by analyzing the switc-hing-status data in alarm information and finding out the outage area , the suspicious fault equipment set was deter-mined.Then relevant analyses were made on the suspicious equipment by means of fuzzy analytic model and Hilbert -Huang transform.Finally, the analytic fault degree , frequency distortion degree and energy variation degree were de-fined as indices of fault diagnosis , and with the three indices as evidence forms , the improved D-S evidence theory was adopted so as to obtain the final diagnosis results .Simulation and calculations showed that the proposed method could effectively reduce the influence resulted from relay or breaker ’ s mal-operation or fail -operation and signifi-cantly increase the diagnostic accuracy of power grid faults .%随着广域测量系统和故障录波信息网的广泛应用，系统的电气量信息获取也越来越方便可靠。利用融合开关量和电气量信息的综合故障诊断方法，首先通过分析报警信息中的开关量信息、搜索停电区域，得到可疑故障设备集；然后对可疑设备进行模糊解析模型求解分析以及相关电气量的希尔伯特黄变换分析；最后，定义元件的解析故障度、频率畸变度和能量变化度三个故障测度，并将这三者作为证据体采用改进的D-S证据理论进行融合得到最终诊断结果。算例表明，该方法能有效降低保护和断路器拒动、误动的影响，提高故障诊断结果的准确度。