基于改进复杂网络模型的电网关键环节辨识

为了更好地揭示电网复杂形态下的特性以及辨识可能触发电网大规模事故的关键环节,通过功率传输路径、功率加权传输距离、路径传输能力的定义对已有的电网复杂网络模型进行改进,使之符合电网基本电气规律和满足物理特性约束。进而基于改进的电网复杂网络模型建立了包含距离度、能力度、枢纽介数、距离介数和能力介数的电网关键节点和支路的评价指标集,使之能准确考虑节点和支路在电网结构和运行中的地位和作用。利用所述模型对IEEE典型系统以及某省级电网进行建模和关键环节辨识,取得了较好效果,并通过与现有方法的对比验证了算法的合理性与有效性。

Identification of Power Grid Key Parts Based on Improved Complex Network Model

To better reveal the characteristics of the power grid with its complexity and identify the key parts that may trigger a large-scale accident within the grid, the existing power grid complex network model is improved by the definition of power transmission path, weighted power transmission distance and path transmission capability, which now complies with the basic electrical law of power grid and the physical constraints. Based on the improved power grid complex network model, an evaluation index set of the key bus and branches within the grid is established, including indices of distance degree, capability degree, hub betweenness, distance betweenness and capability betweenness, which fully considers the variety of tasks that each and every key bus and key branch undertake in the grid structure and operation. Simulations of both IEEE typical test system and Hubei power grid are conducted using the proposed model and algorithm, with key parts identification yielding good results. In comparison with some existing methods, the rationality and effectiveness of the proposed algorithm are verified.