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.