一种换流变压器涡流损耗功率频率特性的修正方法  

A correction method for the frequency dependence of eddycurrent loss power of converter transformer

作　　者：郑欣 马永超 禹文静 彭涛 麻滨麒 李世松[2] ZHENG Xin;MA Yongchao;YU Wenjing;PENG Tao;MA Binqi;LI Shisong(Marketing Service Center,State Grid Hubei Electric Power Co.,Ltd.,Wuhan 430018,China;Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]国网湖北省电力有限公司营销服务中心,武汉430018 [2]清华大学电机工程与应用电子技术系,北京100084

出　　处：《电测与仪表》2025年第4期141-147,共7页Electrical Measurement & Instrumentation

基　　金：国家电网有限公司科技项目(5700-20212 2200A-0-0-00)。

摘　　要：目前对换流变压器涡流损耗功率的评估,一般采用IEC 61378-2和GB/T 18494.2标准推荐的损耗功率外推法。但实践中发现,以该方法的拟合公式在高频次谐波下计算换流变压器的涡流损耗功率存在较大误差。文章提出一种考虑换流变压器绕组参数的涡流损耗功率频率特性修正方法,具体利用绕组单根导体在亥姆霍兹线圈磁场中产生的涡流损耗功率随激励电流频率变化的规律,等效地获取了因趋肤效应导致的换流变压器涡流损耗功率频率特性的修正量,并与现有修正方法进行了性能比较。理论推导和数值分析结果表明,以文中所提出方法构建的磁路和仿真模型,更符合换流变压器漏磁在绕组中产生涡流损耗功率的物理特性,对准确评估换流变压器谐波涡流损耗功率更具指导意义。At present,the eddy current loss of the converter transformer is estimated based on an extrapolation method recommended by the IEC-61378-2 standard and GB/T 18494.2 standard.However,practical measurements already show the recommended method has a poor accuracy for evaluating eddy current loss at high order harmonic frequencies.In this paper,a correction method is proposed for the frequency dependence of eddy current loss considering winding parameters of converter transformer.The eddy current loss power generated by a single a copper conductor of the winding in the magnetic field of a Helmholtz coil changes with the excitation current frequency,and the correction amount of the frequency dependence of eddy current loss power in the converter transformer caused by the skin effect is obtained equivalently.The perforance of the proposed correction is compared with other existing methods,and the numerical results show that the proposed method can fit well to the physical characteristics of eddy current loss power generated by flux leakage of converter transformers in windings,which is helpful to improve the accuracy of estimating the harmonic eddy current loss of converter transformer.

关 键 词：换流变压器 涡流损耗 损耗频率特性 能效评估 

分 类 号：TM93[电气工程—电力电子与电力传动]