基于序电流灰色关联分析与多信息融合的广域后备保护算法

为了提高广域后备保护的容错能力,在集中分布式分区原则下,提出了电气量与多信息融合相结合的保护算法。该方法首先对分区内母线按照序电压分布特点排序后找出疑似故障线路。随后区域中心变电站将各个子站的录波数据计算得到疑似故障线路的综合序电流,之后利用灰色关联分析求得各疑似线路的故障度。同时,区域中心变电站向子站索取各IED回传的保护信息,计算疑似故障线路的故障度。最后,将两种故障度加权融合辨别故障位置。仿真算例表明,将电气量引入能够提高广域后备保护的容错能力,在复杂工况下也可以准确辨认出故障位置。

Wide area backup protection algorithm based on grey correlation analysis of sequence current and multi-information fusion

In order to improve the fault tolerance ability of Wide-Area Backup Protection (WABP), under the principle of centralized distributed partition, this paper proposes a protection algorithm based on the combination of electrical quantity analysis and multi-information fusion. This method first finds the Suspected Fault Line (SFL) after sorting the bus in the partition according to the characteristics of the sequence voltage distribution. Then the regional center substation will calculate the recorded data from each sub-station to obtain the integrated sequence current of the SFL, and then use the grey correlation analysis to obtain the fault degree of SFL. At the same time, the regional center substation asks the sub-station for the IED return protection information to calculate the SFL fault degree. Finally, the two fault degrees are weighted to identify the fault location. The simulation results show that the introduction of electrical quantity can improve the fault tolerance ability of WABP, and can correctly identify the fault location under complex conditions. This work is supported by National Natural Science Foundation of China (No. 61403246).