基于辅助绕组的中频变压器绕组交流电阻测量方法
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摘要
在电力电子应用场合,为了校核中频变压器绕组损耗设计值,需要进行绕组交流电阻的精确提取。目前通常用阻抗分析仪、LCR参数测试仪等设备测量变压器短路阻抗以得到绕组交流电阻,但是仅能得到一次、二次绕组总的等效交流电阻,无法将一次、二次绕组的交流电阻分离。该文主要研究能够实现一次、二次绕组交流电阻分离的测量方法。首先建立变压器互感耦合模型,进行辅助绕组测量方法的误差分析,研究各绕组之间的耦合关系对阻抗测量结果的影响;进而提出对称耦合辅助绕组测量方法,开展2kW中频变压器样机在负载工况下的交流电阻在线测量实验,通过理论分析、有限元仿真及短路试验结果验证所提测量方法的准确性。
The measurement of winding AC resistance is important for the copper loss evaluation of medium-frequency transformer(MFT) in the power electronic system.The common method is short-circuit test using impedance analyzer or LCR meter,which can only obtain the total AC resistance of primary and secondary winding.The measurement method to separate the AC resistance of the two winding is presented in this paper.An impedance coupling analytical model of MFT with auxiliary winding is developed,and the effect of coupling coefficient of primary winding between auxiliary winding and secondary winding on measurement results of AC resistance is analyzed.Finally,an online symmetrical coupling auxiliary winding measurement method is developed based on foregoing analytically determined information to significantly increase measurement accuracy.The developed method is applied in a 2kW MFT,where the accuracy of online measured results is validated by Dowell model,finite-element analysis predicted results and standard short-circuit test.
The measurement of winding AC resistance is important for the copper loss evaluation of medium-frequency transformer(MFT) in the power electronic system.The common method is short-circuit test using impedance analyzer or LCR meter,which can only obtain the total AC resistance of primary and secondary winding.The measurement method to separate the AC resistance of the two winding is presented in this paper.An impedance coupling analytical model of MFT with auxiliary winding is developed,and the effect of coupling coefficient of primary winding between auxiliary winding and secondary winding on measurement results of AC resistance is analyzed.Finally,an online symmetrical coupling auxiliary winding measurement method is developed based on foregoing analytically determined information to significantly increase measurement accuracy.The developed method is applied in a 2kW MFT,where the accuracy of online measured results is validated by Dowell model,finite-element analysis predicted results and standard short-circuit test.
引文
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[15]Dowell P L.Effects of eddy currents in transformer windings[J].Proceedings of the Institution of Electrical Engineers,1966,113(8):1387-1394.
[2]肖晗,叶志浩,马凡,等.舰船直流区域配电系统安全运行边界计算与分析[J].电工技术学报,2016,31(20):202-208.Xiao Han,Ye Zhihao,Ma Fan,et al.Calculation and analysis of the safe operation boundary of shipboard DC zonal electric distribution system[J].Transactions of China Electrotechnical Society,2016,31(20):202-208.
[3]赵争鸣,刘方,陈凯楠.电动汽车无线充电技术研究综述[J].电工技术学报,2016,31(20):30-40.Zhao Zhengming Liu Fang Chen Kainan.New progress of wireless charging technology for electric vehicles[J].Transactions of China Electrotechnical Society,2016,31(20):30-40.
[4]Peng S,Juergen B.Influence of material properties and geometric shape of magnetic cores on acoustic noise emission of medium frequency transformers[J].IEEE Transactions on Power Electronics,2016,32(10):7916-7931.
[5]赵争菡,汪友华,凌跃胜,等.大容量高频变压器绕组损耗的计算与分析[J].电工技术学报,2014,29(5):261-264.Zhao Zhenghan,Wang Youhua,Ling Yuesheng,et al.Calculation and analysis of loss in high-capacity high-frequency transformers[J].Transactions of China Electrotechnical Society,2014,29(5):261-264.
[6]赵争鸣,施博辰,朱义诚.对电力电子学的再认识--历史、现状及发展[J].电工技术学报,2017,32(12):5-15.Zhao Zhengming,Shi Bochen,Zhu Yicheng.Reconsideration on power electronics:the past,present and future[J].Transactions of China Electrotechnical Society,2017,32(12):5-15.
[7]律方成,郭云翔,付超,等.基于磁链分区的大功率中频变压器漏感参数计算方法[J].电工技术学报,2016,31(5):164-169.LüFangcheng,Guo Yunxiang,Fu Chao,et al.Calculation method for leakage inductance of high power medium frequency transformers based on flux linkage partition[J].Transactions of China Electrotechnical Society,2012,31(5):164-169.
[8]卢子广,赵刚,杨达亮,等.配电网电力电子变压器技术综述[J].电力系统及其自动化学报,2016,28(5):48-54.Lu Ziguang,Zhao Gang,Yang Daliang,et al.Overview of research on power electronic transformer in distribution network[J].Proceedings of the CSU-EPSA,2016,28(5):48-54.
[9]湖南银河电气,变频功率标准源简介[EB/OL].2013-04-05.http://www.yinhe-hn.com.
[10]张江涛,田锋,潘仙林,等.交流高频大电流国家基准的建立[J].中国计量,2011(6):68-71.Zhang Jiangtao,Tian Feng,Pan Xianlin,et al.AChigh-frequency current national primary standard[J].China Metrology,2011(6):68-71.
[11]Keradec J.Validating the power loss model of a transformer by measurement-validation is key[J].IEEE Industry Applications Magazine,2007,13(4):42-48.
[12]Dingsheng L,Fuchs E F.Real-time monitoring of iron-core and copper losses of transformers under(non)sinusoidal operation[J].IEEE Transactions on Power Delivery,2006,21(3):1333-1341.
[13]Yongtao H,Eberle W,Yan-Fei L.A practical copper loss measurement method for the planar transformer in high-frequency switching converters[J].IEEETransactions on Industrial Electronics,2007,54(4):2276-2287.
[14]Wang R,Xiao F,Zhao Z,et al.Online measurement method of medium-frequency transformer leakage resistance by using symmetrical coupling auxiliary winding[C]//IEEE International Magnetics Conference(INTERMAG),Beijing,China,2015:15303457.
[15]Dowell P L.Effects of eddy currents in transformer windings[J].Proceedings of the Institution of Electrical Engineers,1966,113(8):1387-1394.
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