一种识别电网关键输电断面的新方法

快速、准确、完整地识别出电网关键输电断面,对于提高电网运行的稳定性及防止大停电事故的发生意义重大。首先,综合考虑电网拓扑结构和支路潮流分布状态,以线路导纳模值与其有功潮流幅值之比即导流比作为线路权重,建立了电网的加权网络模型,使其更符合复杂多变的实际电网；其次,针对已有电网关键输电断面搜索方法的局限性,提出了一种基于改进Floyd算法搜索前k最小权路径的方法,克服了仅搜索第一最短路径上的线路造成的漏选；最后通过层层递进的筛选方法快速完整地识别出关键输电断面,同时也能对潮流反向增大的线路有效识别。在新英格兰39节点系统的仿真结果中验证了所提方法的正确性和有效性。

A new method for identifying key transmission sections of power grids

Identifying the key transmission sections of the power grid quickly, accurately and completely is of great significance for improving the stability of power grid operation and preventing the occurrence of blackouts. Firstly, taking into consideration the topological structure of the power grid and the distribution status of the branch power flow, redefining the weights of the circuits, establishing a weighted network model of the power grid to make it more in line with the complex and varied actual power grid;. Secondly, aiming at the limitations of the existing power transmission section search method, this paper proposes a method based on the improved Floyd algorithm to search the first k minimum weight path, which overcomes the leakage selection caused by searching only the line on the first shortest path. The progressive screening method quickly and completely identifies the key transmission sections, and can also effectively identify the lines whose power flow direction is reversed. The correctness and effectiveness of the proposed method are verified in the simulation results of the New England 39-node system.