智能变电站二次系统回路安全在线监测技术研究

针对目前智能变电站二次系统回路监测方法有效性较差的问题,提出智能变电站二次系统回路安全在线监测技术。将极性作为智能变电站二次系统回路的重要特征,定义广义变比,在此基础上辨识系统回路的极性,分析极性监测受回路综合误差产生的影响,获得极性故障判断依据,以此实现回路故障检测。结合灰色关联分析法和熵权法对检测到的故障进行识别,完成智能变电站二次系统回路安全在线监测。实验结果表明,该监测技术的故障识别正确率高、故障检测误判率低、故障检测效率高、故障识别效率高,以及鲁棒性好。

Research on On-line Safety Monitoring Technology of Secondary System Loop in Intelligent Substation

The safety on-line monitoring technology of the secondary system loop of the smart substation is proposed.The polarity is regarded as an important feature of the secondary system loop of the smart substation , and the generalized variable ratio is defined.On this basis , the polarity of the system loop is identified , and the influence of the polarity monitoring caused by the comprehensive error of the loop is analyzed to obtain the basis for judging the polarity fault , so as to realize the fault detection of the loop. Combined with grey correlation analysis method and entropy weight method , the detected faults are identified and the safety online monitoring of the secondary system loop of smart substation is completed.Experimental results show that the monitoring technology has high fault recognition accuracy , low fault detection misjudgment rate , high fault detection efficiency , high fault recognition efficiency and good robustness.