Study on FRA Modeling of Autotransformer Winding with Frequency-Dependent Characteristics

被引：0
作者：
Zhou L. [1 ]
Zhou X. [1 ]
Lin T. [1 ]
Wu Z. [1 ]
Gao S. [1 ]
Zhang C. [1 ]
机构：
[1] School of Electrical Engineering, Southwest Jiaotong University, Chengdu
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2022年 / 43卷 / 02期
关键词：
Autotransformer; Frequency response; Frequency-dependent characteristics; Resonance point; Split winding; State-space equation;
D O I：
10.3969/j.issn.1001-4632.2022.02.15
中图分类号：
学科分类号：
摘要：
Taking the split winding of an autotransformer with step-lap laminated core as the research object, the magnetic conductivity characteristics of the step-lap laminated core were obtained by numerical calculation and homogenization modeling. Then the frequency-dependent characteristics of winding inductance and resistance were calculated by using finite element software. Taking the transformer winding cake as an element, the analytic model of winding state-space equation considering the frequency-dependent characteristics was established in MATLAB and the winding frequency response of normal and axial displacement faults was calculated. Finally, the correctness of the model was verified by experiments. The results show that the anisotropic relative effective permeability for the laminated core of autotransformer and the inductance of the winding decrease gradually with the increase of frequency, while the resistance of the winding increases. Compared the theoretical value with the measured value, the winding frequency response curves have the same variation trend under normal and axial displacement faults, and the maximum errors of resonance point frequency considering the frequency-dependent characteristics are -3.35% and 5.42% respectively. When considering and not considering the effect of laminated core steps, the maximum errors of resonance point frequency are -3.35% and -8.48% respectively. Therefore, the homogenization modeling considering the effect of laminated core steps can improve the modeling accuracy of winding frequency response and effectively improve the calculation accuracy of winding inductance parameters. The analytical frequency response curves are also more accurate. © 2022, Editorial Department of China Railway Science. All right reserved.
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页码：134 / 142
页数：8
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