基于保护元件与PMU数据多源的广域后备保护算法

为了提高广域后备保护的准确性与容错性,提出了一种同时利用传统保护元件和相量测量单元（PMU）数据的广域后备保护算法。将实时获得的广域保护动作加权,得到综合判断值,然后采用高斯函数获得对应的故障概率。同时,根据统计数据,由正序电压幅值、线路两侧正序电流相角差,计算得到PMU数据对应的故障概率,再将两种故障概率加权综合。在理论上定量地分析了广域保护容错的极限位数。在IEEE 14节点系统上的多组案例实验结果表明,该算法对多个保护误动与拒动有较高的容错性,并且能够检测多重故障。

Wide-area Backup Protection Algorithm Based on Multi-source Data of Protection Elements and Phasor Measurement Units

In order to improve the correctness and fault-tolerance of wide-area backup protection,a novel wide-area protection algorithm using traditional protection components and phasor measurement unit(PMU) data is proposed.Firstly,the online obtained protection components are weighed to get the comprehensive judgment value.Then a Gaussian function is used to get the fault probability.At the same time,using the amplitude of positive sequence voltage and phase angle difference of positive-sequence currents within a line,the probability from PMU is also obtained.These two probabilities are weighted comprehensive to find the fault component.The limit digit number of wide-area backup protection is analyzed theoretically.The simulation tests based on IEEE 14-bus system illustrate the effectiveness and high fault-tolerance capability of the algorithm with the mis-operation and refuse-operation of multiple protections,as well as the detection of multiple faults.