基于非线性复数磁导率模型的叠片铁心损耗计算

Calculation of laminated core loss based on nonlinear complex permeability model

为实现频域计算中电力变压器损耗分布特性的快速计算,本文基于非线性复数磁导率模型,在保证计算精度的同时,提出了一种正弦稳态服役条件下叠片铁心损耗分布的快速计算方法。首先,基于磁滞回线面积等效原理,在考虑基本磁化曲线非线性特性的基础上,得到复数磁导率的实部与虚部;其次,为了验证本文所提出模型对变压器铁心损耗预测的有效性,耦合铁心叠片均匀化方法,建立了单相叠片铁心的频域有限元仿真模型,对变压器铁心中损耗与磁通密度分布进行计算;最后,制作了单相变压器铁心实验模型,搭建单相变压器铁心损耗实验平台,对本文所提出的方法有效性进行验证。结果表明,基于非线性复数磁导率叠片等效的变压器铁心损耗计算方法具有参数辨识过程简单、计算精度较高等特点,在变压器长期正弦稳态服役条件下的损耗计算与温升预测中具有一定应用前景。

In order to realize the fast calculation of power transformer loss distribution in frequency domain,a fast calculation method of laminated core loss distribution under sinusoidal steady-state service condition based on the nonlinear complex permeability model is proposed in this paper.Firstly,based on the area equivalent principle of the hysteresis loop,the real part and the imaginary part of the complex permeability are obtained by considering the nonlinear characteristics of the basic magnetization curve.Secondly,in order to verify the effectiveness of the proposed model for the prediction of transformer core loss,a frequency domain finite element simulation model of single-phase laminated core is established by coupling the core lamination homogenization method to calculate the loss and magnetic density distribution in the transformer core.Finally,the single-phase transformer core experiment model is made,and the single-phase transformer core loss experiment platform is built to verify the effectiveness of the method proposed in this paper.The results show that the transformer core loss calculation method based on nonlinear complex permeability lamination equivalence has the characteristics of simple parameter identification process and high calculation accuracy.It has a certain application prospect in the loss calculation and temperature rise prediction of transformer under long-term sinusoidal steady-state service.