极坐标系下的快速等效电流量测变换状态估计方法

利用SCADA系统提供的多种类型量测数据,推导出极坐标系下的等效电流量测变换算法。为了提高计算速度,采用了快速解耦法的两个合理假设条件,将雅可比矩阵简化为常数矩阵,并根据该矩阵的特点对信息矩阵进行分块化简,最终得到解耦的信息矩阵,将信息矩阵规模最终减少到常规算法的1／4。此外,还提出了一种直接生成信息矩阵的方法。理论分析与WSCC和NewEngland两个系统的算例表明该方法具有简单、快速、线性收敛的特点,能够满足大型电力系统实时状态估计的需要。

Fast State Estimation Method in Polar Coordinates Based on Equivalent Current Measurement Transformation

A fast state estimation method is presented based on equivalent current measurements in polar coordinates using the varied kinds of measurements provided by SCADA system. To improve the calculation speed, this paper adopts two hypotheses of fast-decoupled state estimation method and simplifies Jacobian into constant matrix. A decoupled gain matrix is obtained by zeroing submatrices of the gain matrix according to the Jacobian structure feature. Moreover, a new method is presented to form the gain matrix directly. Theoretical analysis and tests of WSCC and New England systems show that the method is of linear convergence nature, and can meet the requirements of on-line application of power system state estimation.