基于网络抗毁度的配电网供电可靠性模型

摘要

The traditional reliability index cannot reflect the damaged degree of system attacked. Combining the network invulnerability degree concept in the graph theory,a power supply reliability model of distribution network based on network invulnerability index is proposed. First,on the basis of average equivalent shortest way theory,a power supply reliability model of distribution network taking invulnerability index as static global optimization index is established. Secondly,the improved niche genetic algorithm which can enhance global search capability by considering the diversity of the group and the distance between individuals is used to solve the problem. Finally,the network reconstructions based on invulnerability degree and traditional reliability index are compared and analyzed. The results showed that along with the improvement of network invulnerability,load node loss had a significantly reduced risk when a fault occurs;as a static global index,network invulnerability can make up the deficiency of traditional reliability index of the distribution network from the perspective of system and load level. The rationality and validity of the proposed model and solution method are verified.%针对传统可靠性指标存在无法反映系统维持供电能力即被破坏程度的缺陷，结合图论中网络抗毁度概念，提出了一种基于网络抗毁度的配电网可靠性模型。首先，在定义等效最短路径数的基础上，建立了以网络抗毁度作为静态全局性优化指标的配电网可靠性评估模型；其次，采用改进小生境遗传算法对该模型进行求解，兼顾种群多样性与个体间距离，提升全局寻优能力；最后，对基于抗毁度和传统可靠性指标的网络重构进行对比分析。结果表明：随着网络抗毁能力的提升，电网发生故障时负荷节点损失风险显著下降；网络抗毁度作为一类静态全局指标可以从系统层面和负荷层面弥补传统配电网可靠性指标的不足。验证了所提模型和求解方法的合理性与有效性。