摘要
在大容量多端口变换器中,高频振荡问题严重威胁系统的可靠运行,而高频变压器的分布电容则是重要的影响因素之一。为了在设计阶段精确计算高频变压器的分布电容,该文对不同绕组结构圆导体和利兹线的分布电容已有计算方法进行了总结,根据圆导体匝间的电场线路径提出了分段解算方法,指出了利兹线现有分析方法研究的不足,并提出了一种修正方法。考虑到高压大容量高频变压器绕组隔离层的影响,对典型C型、 Z型绕组排布方式和任意多匝多层多并联绕组排布方式的分布电容解析计算进行重新推导。通过有限元仿真和实验分析,验证了所提方法的准确性,为后续高频变压器的分布电容计算以及系统分析设计提供了基础。
High-power multi-port converters can have high-frequency oscillations that seriously threaten system reliability, with the parasitic capacitance of the high-frequency transformers(HFTs) being one of the important factors. This paper summarizes the existing methods for calculating the parasitic capacitance of solid wires and litz wires and presents a piecewise solution method based on the electric field lines between solid wires to calculate the HFT parasitic capacitance. This study also corrects the shortcomings of the existing analysis method for litz wires. The analytical method for calculating the parasitic capacitance for typical C-type and Z-type winding arrangements and arbitrary multi-turn, multi-layer winding arrangements is re-derived taking into account the influence of the isolation layer in high-voltage, high-capacity transformer windings. Comparisons with finite element predictions and experimental data verify the accuracy of this method as a foundation for calculating the parasitic capacitance of HFTs for system design and analyses.
作者
许伟
赵争鸣
姜齐荣
XU Wei;ZHAO Zhengming;JIANG Qirong(Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2021年第10期1088-1096,共9页
Journal of Tsinghua University(Science and Technology)
基金
国家重点研发计划项目(2017YFB0903203)。
关键词
高频变压器
分布电容
静电场分析
有限元仿真
high-frequency transformer
parasitic capacitance
static electric field analysis
finite element method
