考虑磁芯饱和的扼流变压器非线性模型  

A nonlinear model of choke transformer considering core saturation

作　　者：崔勇[1] 杨晓凡 谢路雨 CUI Yong;YANG Xiaofan;XIE Luyu(School of electronic information engineering,Beijing Jiaotong University,Beijing 100044,China)

机构地区：[1]北京交通大学电子信息工程学院,北京100044

出　　处：《北京交通大学学报》2023年第5期117-125,共9页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家重点研发计划(2020YFC2200704);国家铁路局课题研究计划(SJ2021-041)。

摘　　要：针对25 Hz相敏轨道电路使用的扼流变压器由于不平衡牵引电流引起的磁芯饱和问题,提出一种JA(Jiles-Atherton)磁滞模型和三电容变压器模型相结合的扼流变压器非线性模型的建模方法.首先设计基于粒子群优化(Particle Swarm Optimization,PSO)的JA磁滞模型参数辨识算法,并使用该算法和能量计算法分别提取铁芯的JA磁滞回线参数和扼流变压器非线性模型中的分布参数;然后将计算得到的分布参数与Maxwell的仿真结果进行对比,得出本文方法提取的扼流变压器漏感和分布电容等参数具有较好的精确性;最后将非线性扼流变压器模型BH曲线、励磁电流和输出电压曲线的求解结果与Pspice的仿真结果进行对比验证.研究结果表明:利用本文的模型可以准确分析扼流变压器中磁芯饱和问题.可以通过分析此模型磁芯的实时磁滞回线形状或者扼流变压器原边电流的畸变情况来判断磁芯的饱和状态.To address the magnetic core saturation caused by unbalanced traction currents in 25 Hz phase-sensitive track circuits,a modeling method for the nonlinear model of a choke transformer is proposed.The approach combines the JA(Jiles-Atherton)hysteresis model and the three-capacitor transformer model.Firstly,a JA hysteresis model parameter identification algorithm based on Particle Swarm Optimization(PSO)is designed.This algorithm,along with the energy calculation method,is utilized to extract the JA hysteresis loop parameters of the iron core and the distribution parameters in the nonlinear model of the choke transformer,respectively.Subsequently,by comparing the calcu-lated distribution parameters with Maxwells simulation results,it is concluded that the parameters,such as leakage inductance and distributed capacitance of the choke transformer,extracted by our method exhibit good accuracy.Finally,the results of solving the BH curve,excitation current,and output voltage curves of the nonlinear choke transformer model are compared and verified against Pspice simulation results.The research results indicate that the proposed model can be utilized to accu-rately analyze the saturation problem of magnetic cores in choke transformers.The saturation state of the magnetic core can be determined by analyzing the real-time hysteresis loop shape of the model core or the distortion of the primary current in the choke transformer.

关 键 词：扼流变压器 磁芯饱和 JA磁滞模型 三电容变压器模型 

分 类 号：U284.2[交通运输工程—交通信息工程及控制]