用于降低网络损耗的配电网重构算法

DISTRIBUTION NETWORK RECONFIGURATION FOR POWER LOSS REDUCTION

提出了用于降低网络功率损耗的配电网重构算法。算法从原树状网潮流分布出发 ,将负荷转化为相应的注入恒电流 ,合上所有联络支路形成网格状网络并求得其经济电流分布。在经济电流分布的网格状纯电阻网络中叠加模拟断开相应支路的纯电阻环流网即可求得断开支路后网络的电流分布 ,且后一网络的功率损耗为前二网络损耗之和 ,从而将问题转化为求取网损最小的模拟断开支路的环流网的问题。计算求得相应的断开支路可得对应网损最小的树状网 ,通过算例说明算法有效、实用。

This paper proposes a method for reconfigura tion of power distribution network to reduce power loss of the network. When the load flow solution of tree shape network is obtained, the bus voltage, branch current and bus injection current can also be estimated. With all links closed, the economic current distribution of the meshed network can be calculated in the assumption of all branches to be only modeled by resistance. A new network can be built up through the superposition of the meshed network and the circulating network. After opening some branches, a new tree is obtained,and the loss must be greater than that of [WT5”,6BZ]the economic meshed network. The goal of reconfiguration is to search a tree with minimum loss. Hence the network reconfiguration problem can be converted to the problem of searching the branches which should be opened to reach the minimum loss of the circulating network. Using the loop formulation of the circulating network, the relation of the circulating network loss and branch current can be evaluated, then the tree with minimum loss can be obtained. The branches which should be opened are worked out step by step and the tree network with the minimum loss will be accomplished. Case studies are given to show that the method is efficient and practical. Another advantage of the method is that some constraints such as branch load limit can be easily included in.