计及最大供电能力和最小联络建设费用的主变联络结构优化

摘要

针对现有面向最大供电能力提升的主变联络结构优化方法仅基于主变互联关系对联络通道进行规划,未对通道内馈线联络关系展开讨论的不足,提出一种基于帕累托最优的主变联络结构优化方法.首先,为提高配电网区域最大供电能力、降低考虑地理因素的联络建设费用,将馈线互联矩阵作为决策变量,建立变电站主变间联络结构的多目标优化模型.其次,采用NSGA-Ⅱ算法对模型进行求解,将所得帕累托前沿中的个体作为备选方案,利用变异系数法和TOPSIS法对其进行排序,选取最佳联络结构优化方案.所得优化结果不仅包含各主变间联络通道建设结果,同时明确地表明通道内联络支路的数量及位置.工程实例分析结果表明该方法是正确和有效的.%The current methods to optimize the contact structure among main transformer stations in distribution network based on power supply capability,only considers the interconnections of contact corridors among main transformers,but ignores the interconnections among feeders.In view of the shortages of existing methods,a method based on the Pareto optimality of the main transformers contact structure optimization is proposed.First,in order to improve total supply capacity of the distribution area and reduce construction cost which takes geographic factors into account,a multi-objective optimization model based on the feeder interconnection matrix for the contact structure of main transformers between substations is built.Furthermore,the NSGA-Ⅱ algorithm is used to solve the model and the obtained individuals of Pareto frontier are taken as alternative options.To sort the alternative options,the variation coefficient method and the TOPSIS method are used and the optimal contact structure planning is screened out.The resulting optimization not only contains the contact corridors between the main transformers,but also shows the composition of the number and location of contact branches clearly.The validity and effectiveness of the proposed method is verified by the analysis of a practical example.