基于AMI量测信息的变压器参数辨识方法

针对配电网变压器参数辨识的难题,本文提出基于高级量测体系(AMI)量测信息的配电变压器参数辨识方法。该方法首先基于AMI提供的多时段量测数据,建立关于双绕组变压器参数的非线性方程组,并采用最小二乘法对其进行求解;然后以各时段的变压器参数估计值为样本,采用随机样本的方差系数判据对样本中误差较大的参数估计值进行剔除,获得变压器参数新样本空间;最后基于新样本空间计算变压器参数的均值,并将其均值作为最终的参数估计值,进而实现变压器参数的辨识。算例证明了本文方法的可行性与有效性。

Identification Method for Transformer Parameters Based on AMI Metering Data

Considering that it is difficult to identify the transformer parameters in distribution network,an identification method for transformer parameters based on advanced meter infrastructure(AMI)is presented in this paper. Based on the metering data provided by AMI during multiple periods,the nonlinear equations in terms of the parameters of a twowinding transformer are established at first,and the least square method is employed to solve these equations. Then, the estimation values of transformer parameters during each period are taken as samples,and the variance coefficient criterion for random samples is used to eliminate the estimation values with larger errors in the samples,thus a new sam. ple space of transformer parameters is obtained. At last,the mean value of transformer parameters is calculated based on the new sample space,which is further used as the final estimation value. In this way,the identification of transform. er parameters is realized. The result of a numerical example demonstrates that the proposed method is feasible and effec. tive.