分区加权故障匹配的广域后备保护算法

The wide-area backup protection algorithm with sections weighed fault matching

为了提高容错性,文中研究了一种基于分区加权故障匹配的广域后备保护算法。分析了在线路不同区段发生故障下本线路和相邻各线路的保护元件动作的差异特性,利用几类传统保护的广域冗余信息,构造了线路的实际保护向量与各区段故障期望保护向量,定义了分区加权故障匹配函数,给出了广域后备保护算法的故障判据与流程。采用穷举法进行仿真实验,仿真结果验证了本算法的有效性,它能够在5位保护信息出错情况下保证故障检测的100%正确率。通过仿真实验,分析了广域保护元件的选择及其权重系数、电网拓扑结构及其变化等因素对本算法容错性的影响。

In order to increase the tolerance, a novel wide-area backup protection algorithm with sections weighed fault matching is proposed in the paper. Firstly, it is analyzed that there is difference on relative protection compo- nents of faulted and adjacent lines under different sections. Using redundant wide-area backup protection components, the real protection vector and fault expectation protection vector of each section are constructed. The weighed fault matching function is defined. The fault criterions and process are given to detect the fault component. The simulation test illustrates the effectiveness of proposed algorithm. It has 100% accuracy rate under five protection information er- rors. The factors that include the choice of wide-area backup protection components and their weighted coefficients are analyzed, as well as topological structure of power grid and its change. Keywords： power system, power grid fault, wide-area backup protection, fault matching degree