基于等效功率变换的配电网状态估计算法

提出一种基于等效功率变换的配电网状态估计算法，将配电网中的功率量测、电压幅值量测、电流幅值量测统一变换为支路首端等效功率量测，采用修正量测雅可比矩阵的迭代方法求解。该方法能够利用配电网中的各种量测，并且P，Q解耦迭代，有较高的运算效率和数值稳定性，对量测配置也无特殊要求。文中还提出一种通过添加零虚拟负荷量测提高数值可观性的方法，使原本不可估计的网络能够进行状态估计。

A STATE ESTIMATION METHOD FOR DISTRIBUTION SYSTEMS BASED ON EQUIVALENT POWER TRANSFORMATION

A power trans based state estimation method is proposed for distribution systems. Power measurement, voltage measurement and current measurement are all transformed to equivalent power measurement at the beginning node of branch. An iterative algorithm with revised Jacobi Matrix is used to solve equations. The method can use every kind of measurement in distribution systems, and the iterative algorithm is decoupled on P and Q parts. The method is computationally efficient and steady, without special demands of measurement setting. A method with adding virtual zero load measurement to enhance the observability for state estimation is also proposed.