一种配电网开路潮流转移危险线路的识别方法

An identification method for dangerous lines under power flow transfer in a distribution network open circuit

为了避免配电网潮流转移导致输电线路连锁故障跳闸反应,提出了一种基于改进Dijkstra算法的潮流转移情况下对危险线路识别的方法。首先分析了线路发生故障断开后线路潮流转移主要波及的危险线路,然后将电网转化成加权拓扑图。在此过程中,综合考虑潮流转移量和功率传输裕度这两个指标,并引入阻抗修正系数,将综合阻抗作为线路权重。随后采用改进Dijkstra算法搜索最短路径和次短路径,其所包含的有功潮流转移系数较大的线路即为危险线路。该算法通过C++编程实现,无需多次求解,可有效提高运算效率。最后,采用IEEE39节点标准算例开展仿真分析,论证了所述的方法是有效和实用的。

To avoid cascading overload trips caused by power flow transfer,a method for fast searching of dangerous lines based on an improved Dijkstra algorithm is proposed.First,the main dangerous lines affected by power flow transfer after the line is disconnected because of a fault are analyzed,and the power grid is transformed into a weighted topological graph.In the process,two indices of power flow transfer and line power transmission margin are considered,introducing an impedance correction factor,and taking the integrated impedance of the line as the weight of the line.Then the improved Dijkstra algorithm is used to search the shortest and the second shortest path,and the line with a large active power flow transfer coefficient is taken as a dangerous line.The proposed method can be implemented by C++without the need for repeated solving,so the computing efficiency is improved.Finally,an IEEE39 node system simulation is analyzed.This demonstrates the effectiveness and practicability of the algorithm.