Calculation and Experimental Validation on Leakage Inductance of a Medium Frequency Transformer

Haonan Tian, Zhongbao Wei, Sriram Vaisambhayana, M. P. Thevar, Anshuman Tripathi, P. Kjær
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引用次数: 4

Abstract

Nowadays, medium frequency transformers are widely employed with power electronic converters, offering obvious benefits for modern power system. Rising the switching frequency leads to the need for accurate estimation of the characteristics of a designed transformer. This paper refines the existing analytical frequency-dependent method for accurately calculating leakage inductance in the medium frequency range based on the magnetic field intensity distribution and the stored magnetic energy method. Unlike the previous expressions, the proposed method employs mean turn length of individual layer which makes the calculation more precise. The advantages and impacts of interleaved winding structure to minimize the leakage inductance are also shown by comparing different winding patterns. Transformer prototypes with specifications as 10kW, 500/5000V, 5kHz have been manufactured and tested. The presented equations for inductance calculation are benchmarked to the experimental results on the developed transformer prototypes as well as the finite element analysis (FEM) simulation results.
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中频变压器漏感的计算与实验验证
目前,中频变压器与电力电子变流器广泛配套使用,为现代电力系统提供了明显的效益。提高开关频率导致需要准确估计设计的变压器的特性。本文对现有的基于磁场强度分布和存储磁能法的解析频率相关方法进行了改进,以精确计算中频范围内的漏感。与以往的表达式不同,该方法采用了单个层的平均匝长,使得计算更加精确。通过对不同绕组形式的比较,说明了交错绕组结构在减小漏感方面的优势和作用。已经制造和测试了规格为10kW, 500/5000V, 5kHz的变压器原型。所建立的电感计算方程与所研制变压器样机的实验结果和有限元仿真结果进行了对比。
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