基于图论的主动配电网集中式方向保护研究

Active Distribution Network Centralized Direction Protection Based on Graph Theory

针对主动配电网分布式电源渗透率较高、运行方式多变、故障状态下各测量量与传统配电网差别较大等情况,提出一种基于图论的集中式方向保护方案。利用电流、电压故障分量相位差判别故障方向,并将故障方向信息上传至保护主站;引入图论,根据网络拓扑的连接关系、断路器的开闭状态实时更新顶点-边邻接矩阵并存储故障方向信息;由矩阵中各行、列和网络顶点、边的对应关系生成网络图,再根据网络图中不同位置的故障特征对故障区域进行准确定位。以实例验证了该保护方案在分布式电源接入、系统运行方式改变、网络重构等情况下均有良好的适应性。

For the high penetration rate of distributed power supply,variable operation mode,great difference between measured values&traditional under the fault condition in active distribution network(ADN),a centralized direction protection scheme based on graph theory is proposed.The phase difference of current and voltage fault components is used to identify the fault direction,uploading the fault direction information to the master protection station.By introducing the graph theory,the vertex-edge adjacency matrix is updated and the fault direction information is stored in real time according to the connection relationship of the network topology,opening and closing state of circuit breaker.The network graph is generated from the correspondence between rows and columns in the matrix and vertices and edges in the network,the fault region is accurately located according to the fault features at different positions in the network graph.The example proves that the protection scheme has good adaptability in the case of distributed power access,system operation mode change,network reconstruction and so on.