含分布式电源的辐射状配电网损耗分配方法

A loss allocation method for radial distribution networks with distributed generations

随着售电侧有序开放以及分布式电源的接入,如何公正合理地分配配电网损耗已经成为影响电力市场健康发展的一个关键问题。为此,提出了一种含分布式电源的辐射状配电网损耗分配方法,以实现各市场主体间合理的损耗分配。该方法基于潮流计算的结果,根据线路的有功和无功功率流动进行损耗分配,可分为三个步骤:首先,从电源节点(即发电量大于负荷的节点)开始,依次计算出所有节点分配的损耗,得到连接于节点的负荷分配的损耗;然后,计算连接于节点的分布式电源分配的损耗,同样先计算出节点分配的损耗,与第一步不同的是,节点分配损耗从汇聚节点(即负荷大于发电量的节点)开始计算;最后,对损耗计算结果进行规范化处理。对17节点和IEEE33节点算例系统进行仿真计算,并与其他方法进行对比,表明了所提出方法的公平性和合理性。

With the orderly liberalization of the electricity selling side and introduction of distributed generation（DG）, how to allocate the loss in distribution system fairly and properly is becoming a critical problem, which has influenced the healthy development of electricity market. Thus, this paper proposes a loss allocation method for radial distribution networks with DGs. The method, which is based on power flow solutions and allocates power loss according to the active and reactive power flow of lines, consists of three steps. Firstly, starting from the source nodes（the nodes whose generation is more than their load）, the power loss allocated to all nodes is calculated, then, the loss allocated to the loads connected to the nodes can be obtained. Secondly, the power loss allocated to DGs connected to the nodes is also calculated according to the loss allocated to the nodes. But in this step, the loss allocated to the nodes is calculated starting from the slack nodes（the nodes whose load is more than their generation）, which is different with the first step. Finally, the normalization of the result is executed. The application of the proposed method in a 17-node distribution system and IEEE 33-node test system are analyzed, and the results compared with other methods demonstrate the fairness and reasonability of the proposed method.