由于当前复杂电网故障诊断精度不高,因而基于信息差异图模型提出一种新的调度端电网故障诊断方法.建立信息差异图,通过分析电网内部故障的关键组件,实现电网故障溯源.分析节点信息变化情况,衡量两则有向信息流的共享信息量,计算电网特征区间的质心与采集到的样本点的误差平方和,完成电网特征区间离散化处理.构建电网故障的信息相关矩阵,得到信息差异矩阵数据,分析故障信息状态,实现电网故障诊断.实验结果表明,在未出现故障时,电压波动范围为3.427 273～3.434 364 V,在出现故障时,电压出现明显波动,在3.422 727～3.440 909 V范围内波动,基于信息差异图模型的调度端电网故障诊断方法预警准确率在99.98％以上,需求响应时间低于0.25 s.
Research on Fault Diagnosis Method of Dispatching Power System Based on Information Difference Graph Model
The current method is not accurate in complex power grid fault diagnosis,hence,a new fault diagnosis method based on the information difference graph model is proposed.An information difference graph is established to analyze the key compo-nents of the internal faults of the power grid and realize the fault tracing of the power grid.The change of node information is analyzed,the shared information of two directed information flows is measured,and the sum of error squares between the cen-troid of the grid feature interval and the collected sample points is calculated to complete the discrete processing of the grid fea-ture interval.An information correlation matrix of power grid faults is constructed to obtain the information difference matrix data,analyze the state of fault information,and realize the fault diagnosis of power grid.The experimental results show that the voltage fluctuation range is 3.427 273～3.434 364 V when there is no fault,and the voltage fluctuation is obvious in the range of 3.422 727～3.440 909 V when there is a fault.The warning accuracy of the fault diagnosis method based on the infor-mation difference graph model is above 99.98％.The demand response time is less than 0.25 s.
information difference graph modeldispatching terminal power gridpower grid faultfault diagnosisdiagnosis method
万方数据
维普
