农村电网改造中网架更新的优化方法

Optimal approach on renewing framework for rural power network upgrading

为了适应负荷逐年增长的趋势,对现有网络的网架更新是必需的。该文给出了负荷预测模型,定义了电力网的适应度,根据最小、最大负荷增长率确定规划期末的最小、最大负荷。并且分析了网络的适应度,确定了适应度不满足要求的路径。然后在遵循满足电压质量、投资最小、损耗最低的原则前提下,确定了网架更新方案。并且以农网的实际干线为例,进行计算、分析和比较,结果表明,该文提出的方法可以确定网架的薄弱部分,易于确定网架更新方案,改善网络的节点电压及减小电能损失,而且在保证辐射式网架结构的前提下可以适用于多电压等级、多干线区域网的网架更新。

The annual increase of electric load in rural distribution makes it necessary to renew framework during upgrading rural power network. Model for load forecasting was given,and adaptability of power network was defined in this paper. According to the minimum and maximum load increasing rate,the minimum and maximum load were forecasted in the end of planning period,and adaptabilities of network were analyzed,and paths with bad adaptability were found subsequently. On the basis of satisfied voltage quality,minimum investment,and lowest power loss,the renewal schemes of network were determined. The method proposed was applied to a real grid example. By calculation,analysis and comparison,the results showed that the method can be used for confirming weak part of rural network,and determining the renewal scheme of frameworks. And also the results showed that the loss was significantly reduced,and the node voltage was greatly improved. The method can adapt to the renewal needs of multi-voltage level and multi-line rural network under the structure of radial grid.