基于辅助绕组的高频变压器绕组损耗测量方法  

A Measurement Method of Winding Loss for High-Frequency Transformer Based on Auxiliary Winding

作　　者：汪涛[1] 骆仁松 文继峰 张茂强[1] 田杰[1] Wang Tao;Luo Rensong;Wen Jifeng;Zhang Maoqiang;Tian Jie(NR Electric Co,Ltd,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电工技术学报》2022年第10期2622-2630,2655,共10页Transactions of China Electrotechnical Society

基　　金：国家电网公司科技资助项目(5500-202040326A-0-0-00)。

摘　　要：绕组损耗测量是目前大功率高频变压器(HFT)建模与设计中的难点,高精度的绕组损耗测量方法是校验绕组损耗理论研究正确性、提高建模与仿真精度的重要手段。目前广泛采用的短路阻抗测量方法的精度随测量频率的升高而降低,并不适用于HFT。借助辅助绕组(AW)提供额外测量节点是提高绕组损耗测量精度的有效措施。首先建立包含AW杂散参数的等效电路模型,基于该模型的分析结果表明,AW与被测绕组(WUT)之间漏感及耦合电容决定了绕组损耗测量频率范围及精度。提出一种考虑耦合电容的绕组电阻测量校正方法,降低耦合电容的影响,保证了高频下的测量精度。采用利兹线绕组中单股线作为AW以及AW与WUT之间的漏感被降至极低水平,扩展了测量频率范围,同时降低了工程实践难度。通过对一台100kV·A HFT样机绕组参数的测量,验证了电路模型和校正方法的有效性,并实现了1MHz频率下绕组交流电阻的有效测量。The measurement of winding loss is a difficult issue in the modeling and design of high-power high-frequency transformers(HFT),and a high precision winding loss measurement method is an important tool for verifying the correctness of winding loss theory and improving the accuracy of modeling and simulation.The accuracy of short-circuit impedance measurement method widely used at present decreases with the increase of measurement frequency,so it is not suitable for HFT.Creating additional measurement nodes by aiding auxiliary windings(AW)is an effective measure to improve the measurement accuracy of winding loss.An equivalent circuit model including stray parameters of AW was established,and the analysis results show that the leakage inductance and coupling capacitance between AW and winding under test(WUT)greatly affect the frequency range and accuracy of winding loss measurement.A correction method of winding resistance measurement considering coupling capacitance was proposed,which extended the measurement range of frequency and kept the measurement accuracy under high frequency.A single strand in Litz wire winding was used as AW,the leakage between AW and WUT was thus reduced to a very low level,and the engineering practice of winding loss measurement was simplified.By measuring the winding parameters of a 100kVA HFT prototype,the circuit model and the correction method were verified,and the effective measurement of the winding AC resistance at 1MHz was realized.

关 键 词：高频变压器 绕组损耗 辅助绕组 误差分析 

分 类 号：TM433[电气工程—电器]