基于有限元仿真的高频高压变压器分段绕组漏感设计方法

Design Method for Leakage Inductance of High-frequency High-voltage Transformer With Winding Segmented Based on Finite Element Simulation

为实现高频高压变压器漏感参数的精确控制,提出了一种结合有限元仿真和绕组分段概念的漏感设计方法。首先,将低压绕组分段,并对漏磁路进行集中参数等效。类比平面几何直线公理,给出各分段绕组匝数分配调节过程中漏磁路磁阻恒定这一假定,并由此推导出漏感同各分段匝数及2—3种给定特例漏感值之间的关系式。然后,通过有限元仿真求得特例情况下的漏感值。最后,以低压绕组两分段为例,对3种布局、4种气隙分情况讨论,并将有限元仿真结果同该方法计算结果进行了对比。结果表明:不同布局、气隙搭配组合下的漏感相对误差均在可接受范围内。此外,漏感调节过程中,励磁电感的变化很小,进一步验证了该设计方法的有效性和适用性。

In order to fulfill the precise control of leakage inductance of a high-frequency high-voltage transformer,a leakage inductance design method is proposed by combining finite element analysis and winding segmentation concept.Firstly,the low-voltage windings are divided into several segments,of which the equivalent leakage magnetic circuits can be established with lumped parameters.By analogizing the line axiom in plane geometry,a hypothesis is given that the leakage magnetic reluctances can be seen as constant during the adjustment of the turns of each segment winding.Secondly,the relationship between the leakage inductance and the turns of each segment and the leakage inductances of 2 or 3 given special cases are derived.Thirdly,the leakage inductances under the special cases mentioned above are acquired by finite element simulations.Finally,the low-voltage windings with two segments are taken as an example to study various situations consisting of three layouts and four air gaps,and the finite element simulation results are compared with the calculation results by the proposed method.The results show that the relative errors of leakage inductances are all within an acceptable range under different layout and air gap combinations.In addition,during the leakage inductance adjustment process,the variation of the magnetizing inductance is negligble,which further verifies the effectiveness and applicability of this design method.