城市中压配电网评估方法与实例研究

通过层次分析法建立了较为全面的、适合城市配电网特点的综合评价体系,从技术合理性、安全性等多个方面评价电网;应用点面结合的量化分析方法从整体上反映出电网中的问题,并给出了存在问题最多的变电站和线路;针对所发现的问题提出近期电网的规划方案,并对规划电网进行评估,将评估结果与现状网对比以衡量规划效果;提出近期电网建设改造项目及其优先级排序.上述过程均已开发软件实现,并成功地在北京电力公司下属的多个供电公司得到应用.文中提出的综合评估方法弥补了传统的配电网评估方法中整体性差的不足,近期规划与评估紧密结合的方式为电网建设改造项目的提出与优化提供了新的途径.

Evaluation Method and Case Study of Urban Medium Voltage Distribution Network

By means of analytic hierarchy process (AHP), firstly a comprehensive evaluation system suitable to urban distribution system is established to assess distribution network in such aspects as technical reasonableness, system security, etc. Next, by use of several quantitative analysis methods combined with the individual case and the whole, the problems existing in power system can be overall reflected, and the substations and feeders where most problems exist are given. To solve discovered problems a short-term power network planning is proposed and the evaluation of the planned power network is performed, the evaluation result is compared with the present situation of the power network to be planned to weigh up the effect of the plan. Finally, short-term renovation projects of power network construction and their priority ordering are put forward. A software package of the presented method is developed and successfully applied in power supply companies belonging to Beijing Electric Power Company. The proposed comprehensive evaluation method remedies the insufficiency of weak totality in traditional evaluation method for distribution network, and the way of closely combining the evaluation with short-term planning offers a new approach for the submitting and optimization of renovation projects for distribution network.