中文摘要：

配电网网络参数的不对称使得对称分量法解耦失效,配电网潮流计算元件模型需采用abe全耦合模型.针对配电网长辐射状网络结构可能导致的三相牛顿拉夫逊潮流初值选取难题,提出了一种初值选取方法.首先,将给定的配网三相系统除去合环支路后简化成单相系统,采用单相前推回代得出其潮流解;再利用单相潮流节点电压构造出三相对称电压,以此作为三相牛顿拉夫逊法的初值进行三相潮流计算,克服了配网潮流计算中前推回代与牛顿拉夫逊潮流算法各自的不足.IEEE33节点案例计算结果表明,该方法能够为配电网牛拉法提供合理初值并提高牛拉法收敛速度.

英文摘要：

The asymmetry of network parameters makes the symmetrical component method failing in three-phase decoupling,and the distribution network elements＇ modeling should use abc coordinate full coupling for accurate result.Considering the probable initial value selection problem of Newton method due to long radial network,one selection method is propesed.First,for a given three-phase distribution network,the loop closing branches are remored and the three-phase system is simplified to a single-phase system,and single phase forward-backward algorithm is used to calculate the single phase system.Then the single-phase calculation node voltage is used to construct a positive sequence three-phase node voltage as the initial value of three-phase Newton-Raphson power flow calculation.The method overcomes the deficiency of both the forward-backward algorithm and Newton power flow algorithm.IEEE33 node case shows that this method can solve Newton algorithm initial value selection problem in radiation network and can improve its convergence speed.