保留非线性三相配电网状态估计

该文提出一种基于保留非线性的三相配网状态估计算法。该算法充分利用辐射配网的特点，能够适应r／x比值较大时的情况，计及了三相不平衡，适用于由功率的实时量测和伪量测建立起的基本可观、并有部分电压量测的系统。保留了非线性二阶项，同时由于雅可比矩阵恒定，二阶项易于计算，节省了机时。理论分析和实际算例表明，该算法收敛可靠，运算速度快，内存量少，量测适用性好。

A Nonlinearity-retaining State Estimation for Three-phase Distribution System

A threephase distribution system state estimation algorithm is proposed in thi s paper based on the retaining of nonlinearity. It takes great advantage of the characters of radial feeder,and is fit for the condition that r/x ratio is l arge. Considering the unbalance of a threephase distribution system, this meth od is fit for the observable system which involves the realtime measurement and pseudo measurement of power and some voltage measurement.Because the method r etains the nonlinear second order terms ,the Jacabian martrix is constant, the s econd order terms are easy to computed and computer time is saved. Theoretical analysis and digital simulations are carried out and the results sho w that the method is reliable, efficient, and fit for online application to r adial distribution systems.