基于序分量的辐射网三相潮流求解

Sequence component-based three phase power flow solution for radial distribution network

提出了不对称运行条件下基于序分量的前推回代法求解三相潮流问题。三相潮流问题被分解成正序、负序和零序3个子问题。在求得各序间相互影响各序节点注入电流之后,采取以下求解方法:对正序、负序网络沿辐射支路用前推回代的方法求解,对零序网用常规高斯塞德尔(Gauss-Seidel)迭代法求解,这样可加快求解的速度。实例表明:该方法对未完全换位线路且具有不平衡节点功率时有好的鲁棒性,与直接对三序都用常规Gauss-Seidel迭代法相比,具有收敛快的特点,总的计算时间可缩短,解决了不对称运行条件下的具有多级电压辐射网三相潮流的求解问题。

A three-phase power flow solution based on sequence components for radial network under asymmetric condition is proposed.The original three-phase power flow problem is transformed into three independent sequence component problems.After the node sequence injection current is got,considering the influence from other sequence components,the following solution is applied:for positive and negative sequence problems ,node voltage is solved by for/backward sweep method;for zero sequence problem,node voltage is obtained by Gauss-Seidel iterations.Test samples show that it is preferably robust in dealing with the problems of network calculation with asymmetric para-meters of network and power.Compared with conventional methods,this method has smaller iteration times and faster calculation speed.The proposed method is suitable for three-phase power flow calculation of radial network with multilevel voltage under asymmetric condition.