基于戴维南等值的系统参数跟踪估计

提出了一种在线调控和估计电压稳定裕度的新方法在ｚ－Ｖ空间进行戴维南参数估计，由ｚ－Ｖ空间供应侧特性迭代修正，进行系统等值戴维南参数跟踪。在不同的有效测量数据条件下，该方法能较精确地跟踪系统的等值戴维南参数。与ＳＭＡＲＴ装置比较，该方法具有易于识别不良测量数据，收敛速度、数值稳定性好的特点。

TRACKING AND ESTIMATION OF SYSTEM PARAMETER USING THEVENIN'S EQUIVALENT

A new methodology for on line monitoring and assessment of voltage stability margins is proposed. Using this Thevenin's method the estimation of parameter in z V space is performed. The ratio function from supply side characteristics in z V space is established. The optimum seeking of initial values is carried out and the parameter iteration is revised by Newton Raphson method, and the parameter tracking of the system based on Thevenin's equivalent is implemented. Under different effective measured data, with this method the parameters of the system based on Thevenin's equivalent can be tracked more accurately. Comparing with SMART device project, this method possesses the following advantages: easy to identify the data, high convergence speed, good numerical stability, etc.