基于区域多信息融合的广域后备保护算法

针对广域保护通信流量大、容错性低等问题，提出了一种基于区域多信息融合的广域后备保护算法。首先，对保护系统进行区域划分，并根据故障电流的分布特性进行故障区域搜索，以减少广域保护的通信流量。其次，对故障区域内的保护动作信息进行归一化处理，并计算线路故障证据的基本概率赋值。最后，采用改进的D-S证据理论进行证据融合，进而识别故障线路。基于PSCAD搭建IEEE 39节点系统进行仿真验证，结果表明该算法能有效识别各类型故障，具有广域通信量小，信息容错性高等良好性能。

An algorithm of wide area protection based on regional multi information fusion

Aiming at the phenomena such as heavy communication traffic and low fault tolerance of wide area protection, a wide-area backup protection algorithm is proposed based on regional multi information fusion. Firstly, the protection system is divided into several regions, and the fault area search is carried out according to the distribution characteristics of the fault current, which can reduce the communication traffic in wide area protection. Then, the protection action information of the fault area is normalized to calculate the basic probability assignment of the line fault evidence. Finally, the actual fault line is identified by the improved D-S evidence theory. An IEEE-39 bus model is constructed by PSCAD, the results show that the proposed algorithm can effectively recognize various types of faults, and has good performance of small wide area communication traffic and high fault tolerance.