含分布式电源的配网潮流算法

分布式发电(DG)接入配电网后,配电网由单电源变成多电源,且DG不能简单处理为PQ节点,因此传统的配网潮流算法已不适用.提出了改进节点关联矩阵自乘的配电网潮流算法,在配电网运行方式改变时,只需根据原根节点与新根节点之间的路径对配电网的节点关联矩阵进行修正即可,不需要重新编号.传统方法确定的PV型DG并网点无功初值往往偏离实际值.提出基于无功功率分摊原理的初值确定方法,根据DG安装位置,将负荷无功分摊到根节点和DG之间.算例显示该方法确定的PV型DG并网点无功初值接近于实际值,提高了算法的收敛速度.

Power flow algorithm for distribution network with distributed generation

After the DG(Distributed Generation) is connected into the distribution network,it has multiple power sources and DG can not be treated as PQ node,which makes the traditional power flow algorithms inapplicable. An improved distribution network power flow algorithm with node incidence matrix squaring is presented,which only modifies the node incidence matrix according to the path from original root node to new root node when the operating mode of distribution network changes,renumbering is not necessary. The reactive initial value decided by the traditional algorithm for the connecting point of PV-type DG is often far from the real value. An algorithm to determine the reactive initial value according to the location of DG is proposed, which apportions the load reactive power between the root node and the DG. An example proves the calculated reactive initial value is near the real value and the convergence speed is improved.