基于约束最小二乘法的变压器三相漏感辨识算法

A Three-phase Transformer Leakage Inductances Parameter Identification Algorithm Based on the Constrained Least Squares Method

对于变压器保护,当前提出的功率差动原理、磁通特性识别法、等值电路参数鉴别法及基于变压器的回路方程法等都要求预知原副边各相的绕组电阻和漏感参数。文中提出一种三相漏感的辨识方法,不需改变三角形侧的电流互感器配置,只通过测量空载合闸瞬时的线电压和线电流,利用约束最小二乘法进行2次辨识后,就能够快速、准确地辨识出原副边绕组漏感。通过EMTP仿真和变压器动模试验,表明该算法能够正确辨识各相漏感,误差很小,具有较好的应用价值。

For transformer protection, the current methods such as power differential principle, recognition of magnetic flux characteristics, identification of equivalent circuit parameters and transformer loop equations all require that the primary and secondary winding leakage inductances and resistances are known in advance. This paper proposes a method to identify threephase leakage inductances only by measuring the instantaneous no-load closing of the line voltage and the line current, without changing the current transformer configuration on the triangular side. By using the constrained least squares method twice, the primary and secondary winding leakage inductances can be quickly and accurately identified. The EMTP simulation and experimental results of real transformer indicate the algorithm is effectiveness and has good precision.