In order to accurately analyze the effect of combined magnetic shielding on stray load losses of converter transformer, a three-dimensional (3D) finite-element analysis (FEA) model is established. The total losses can be gotten by summing the simulated losses of each harmonic. The effectiveness of the presented simulation method is verified by comparing the simulated and tested stray load losses of the converter transformer in the case of rated operation without lobe-type magnetic shielding structure. Afterwards, the installation position of lobe-type magnetic shielding is optimized by considering its effect on stray load losses. Finally, the stray load losses under different DC bias currents are simulated and analyzed.

中文翻译：

---

考虑直流偏置的换流变压器组合磁屏蔽对杂散负载损耗影响的数值分析


为了准确分析组合磁屏蔽对换流变压器杂散负载损耗的影响，建立了三维（3D）有限元分析（FEA）模型。将各谐波的模拟损耗相加即可得到总损耗。通过比较无波瓣型磁屏蔽结构额定运行情况下换流变压器的杂散负载损耗仿真与测试结果，验证了该仿真方法的有效性。然后，考虑其对杂散负载损耗的影响，优化了波瓣型磁屏蔽的安装位置。最后对不同直流偏置电流下的杂散负载损耗进行了仿真分析。