考虑材料影响的双向直流固态变压器绕组 损耗计算方法

Calculation Method for Winding Loss of Bi-directional DC Solid-state Transformer Considering Material Influence

为提高双向直流固态变压器的整体效率和功率密度,研究双向直流固态变压器绕组损耗的计算方法。建立双向直流固态变压器绕组损耗基本计算模型,分别从铜箔绕组、利兹线绕组与实心圆导线绕组三方面研究适合不同导体绕组损耗的计算方法,其中采用有限元与傅里叶分解计算方法求得铜箔绕组损耗,通过修正Ferreria算法求得实心圆导线绕组的交流电阻,将其代入双向直流固态变压器绕组损耗基本计算模型中求得实心圆导线绕组损耗,利兹线绕组损耗由Tourkhani利兹线绕组损耗精准模型计算。以铜箔样例绕组与实心圆导线样例绕组为例进行实验,实验结果表明,所研究方法的计算值与实际测量值非常接近,计算精准度高,计算结果具有较高的实际应用价值,可为双向直流固态变压器整体效率优化提供参考。

To improve the overall efficiency and power density of a bi-directional DC solid-state transformer(SST),the calculation method for its winding loss is studied.A basic calculation model for its winding loss is set up,and the calculation method suitable for diflerent conductor winding loss is studied from the aspects of copper foil winding,Litz wire winding,and solid circle wire winding,respectively.The finite element method and Fourier decomposition method are used to calculate the copper foil winding loss.The revised Ferreria algorithm is used to obtain the AC resistance of solid circle wire winding,which is further substituted into the basic calculation model for the winding loss of bi-directional DC SST to obtain the solid circle wire winding loss.The Litz wire winding loss is calculated by the Tourkhani Litz wire winding loss precision model.Experiments were conducted on samples of copper foil winding and solid circle wire winding,and experimental results show that the calculation values obtained using the proposed method were very close to the actual measurement values,indicating a high calculation accuracy.The calculation results are of high practical application values,which can provide reference for the overall efficiency optimization of bi-directional DC SST.