大功率中频变压器空心绕组交流电阻的计算方法  

AC Resistance Calculation Method for Hollow Conductor Windings in High Power Medium Frequency Transformers

作　　者：律方成[1] 郭云翔[1] 王彦旭[1] 于德[1] 李鹏 

机构地区：[1]华北电力大学电力工程系,河北省保定市071003 [2]南车集团青岛四方机车车辆股份有限公司,山东省青岛市266111

出　　处：《中国电机工程学报》2016年第23期6552-6559,6623,共8页Proceedings of the CSEE

基　　金：国家科技支撑计划(2013BAG24B02)~~

摘　　要：将空心绕组应用于大功率中频变压器,在提高绕组材料利用率的同时,变压器的散热效率也可得到提升。但因为其较为特殊的形状,使得通过直接建立解析模型的方法,计算空心绕组高频交流电阻较为困难。为了解决这一问题,该文结合解析计算与数值计算方法,通过大量的有限元模型计算,得到了中频变压器空心绕组与其对应的实心绕组高频交流电阻之间的关系。这种关系被定义为一个新参数,即空心电阻系数。通过分析空心电阻系数与相关参数之间的关系,经典Dowell解析计算公式可被拓展至空心绕组的交流电阻计算中。通过对比一台中频变压器样机空心绕组交流电阻的解析计算、有限元数值计算与实验计算结果,验证了该方法的正确性与有效性。When hollow conductors are applied to high power medium frequency transformer（MFT）, both utilization ratio of the conductor material and cooling efficiency of the transformer can be improved. However, because of the unique shape, it is difficult to evaluate AC resistance of hollow conductors by analytical calculation directly. To solve this problem,this paper combined the analytical and numerical method. Relationship between AC resistance of hollow and the solid conductors in MFT was got by abundant finite element models calculation. The relationship was concluded as a new defined parameter, hollow resistance factor. Through the analysis of the relationship between hollow resistance factor and relevant parameters, the classic Dowell analytical equation can be extended to AC resistance calculation of hollow conductor windings. A MFT prototype with hollow conductors was manufactured. The results comparison of the analytical, finite element numerical, and experimental calculation verified the correctness and effectiveness of the proposed evaluation method.

关 键 词：大功率中频变压器 电力电子变压器 交流电阻计算方法 空心绕组 有限元数值计算 解析计算 

分 类 号：TM433[电气工程—电器]