考虑电网结构脆弱性的配电网网架优化规划

基于复杂网络理论,从网络拓扑结构角度对配电网网架结构的脆弱性进行评估。建立了以配电网投资及运行费用最小、结构脆弱性指标最优为目标的配电网网架多目标优化规划模型。采用改进最小生成树算法,并将经济性指标的减少率和结构脆弱性指标的增长率之和作为迭代过程中的目标函数,将多目标问题转化为单目标进行求解,通过16节点算例验证了该方法在求解多目标配网优化规划问题中的可行性。算例结果表明,所建立的优化规划模型能够有效地评估配电网的结构脆弱性,并能求得结构稳定、经济性好的规划方案。

Planning for distribution network structure optimization in consideration of its vulnerability

Based on the complex network theory, the structural vulnerability of a distribution network was assessed from the view of topology of structures. A multi-objective planning model for distribution network optimization was built, with aims to minimize the summation of investment and operation cost, as well as to optimize the structural vulnerability index. An improved minimum-cost spanning tree algorithm was adopted to optimize this planning model. By using the sum of the decrement rate of the economic target and the increment rate of the structural vulnerability target as the objective functions in the iteration process, the multi-objective problem could be solved as a single-objective problem. Results of a sample system with 16 nodes verify the feasibility of the proposed method used for multi-objective structure optimization of the distribution network. The developed planning model can effectively evaluate the structural vulnerability of a distribution network, so as to acquire an optimal planning scheme with a stable structure and with little cost.