基于相坐标系的配电网三相不对称解耦状态估计算法

New Algorithm for State Estimation Based on Fast Decoupling of Distribution System' s Asymmetrical Three-phase in Phase Coordinates

提出了一种基于相坐标系的配电网三相不对称解耦的状态估计算法。在等效电流量测变换法的基础上,针对配电系统线路参数不对称的特点,引入三相不对称潮流计算中的解耦-补偿电流模型,在相坐标下将三相不对称状态估计方程完全解耦;同时引入旋转变换使每一相的雅可比矩阵和信息矩阵实虚部严格解耦,进一步降低了问题的求解规模。最后提供算例将所提出的方法与等效电流量测变换法进行了比较,结果表明所提出的方法精度较高,具有工程应用的前景和价值。

A new algorithm for state estimation based on the fast decoupling of distribution system＇ s asymmetrical phases in phase coordinates is proposed. On the basis of equivalent current measurement transformation algorithm, according to the line parameters＇ asymmetrical characters in distribution system, the decoupling-compensation modeling of current used for asymmetrical three-phase load flow is introduced, which can completely decouple the state estimation equations of asymmetrical three-phase network in phase coordinates. Besides, with the use of rotation transformation, the real and image parts of Jacobian matrix and information matrix can be strictly decoupled, so that the solution scale is reduced furthermore. In the end, examples are given to compare the proposed method with the equivalent current measurement transformation algorithm. The result shows that precision of the method proposed is higher, so it has better prospect in engineering application.