变压器漏电感参数在线辨识方法研究

On-Line Identification Algorithm for Transformer Leakage Inductance

利用变压器等值回路平衡方程原理,提出了利用加权递推最小二乘法的变压器漏电感参数辨识方法,给出了变压器漏电感参数辨识的等效模型,对变压器模型参数辨识的可行性进行研究,针对不同的情况,分别提出了归算到一次侧的变压器绕组参数辨识方法及变压器原副边漏电感参数辨识方法.利用动模实验数据对变压器漏电感参数辨识的结果表明,参数辨识算法稳定,不受负荷波动以及功率因数变化的影响,辨识结果具有较高的精度.

Leakage inductance is one of the primary parameters in transformer relay protection and on-line monitoring technology. An online identification algorithm for transformer leakage inductance is proposed with recursive weighted least-square algorithm. The equivalent circuit equation of the transformer is achieved to derive the model identifying the leakage inductance. Through analyzing the identifiability of transformer model, two different methods are presented for the identification of resistance and leakage inductance parameters. The experimental transformer circuit model is designed to verify the online identification algorithm. The dynamic test shows that this algorithm is stable and imperious to the fluctuation of loads or power factor, and the identification results have a higher accuracy.