基于潮流介数的电网关键线路辨识

Identification of Key Lines in Power Grid Based on Power Flow Betweenness

为满足电力系统实际运行中对关键线路重点监测的需要,提出线路的潮流介数用于电网关键线路辨识。辨识方法基于复杂网络介数理论,结合电网线路负载率大小、支路潮流追踪以及各发电机与负荷之间的功率传输分布因子构建介数指标,能够有效量化电网线路在发电机和负荷之间的功率传输过程中的作用,物理背景符合电网实际特点。新英格兰39节点系统的仿真结果表明:潮流介数较大的线路往往为具有较高N-1热稳定风险的线路,验证了潮流介数在电网关键线路辨识中的准确性和有效性。

In order to meet the need for key monitoring of critical lines in the actual operation of the power system,the power flow betweenness of lines was proposed for the identification of critical lines of the power grid.The identification method was based on the theory of complex network betweenness,combined with the grid line load rate,branch power flow tracking,and the power transmission distribution factors between each generator and loads so as to construct the betweenness index,which can effectively quantify the effect of lines on the power transmission process between generators and loads,and this physical background conforms to the actual characteristics of the power grid.The simulation results of the 39-bus system in New England show that the line with higher power flow betweenness is often a line with a higher N-1 thermal stability risk,which verifies the accuracy and effectiveness of the power flow betweenness in the identification of critical lines.