考虑磁滞效应的非晶合金-取向硅钢组合铁心双非线性励磁特性研究

Study of Dual Nonlinear Excitation Characteristics of Amorphous Alloy and Oriented Silicon Steel Composite Core Considering Hysteresis Effect

非晶合金-取向硅钢组合铁心可以综合传统纯非晶合金和纯取向硅钢铁心的优势,在配电变压器领域具有广阔的应用前景。对含有2种非线性软磁材料的组合铁心励磁特性进行分析是实现其结构优化设计的前提。首先,建立组合铁心在开路励磁条件下的等效电路模型,并根据基尔霍夫第二定律列写其回路电压方程;其次,根据组合铁心的结构特点建立其等效双非线性磁路模型,并基于安培环路定律和磁通连续性原理列写其磁路方程;再次,根据导数变换将磁路方程耦合至回路电压方程中的电动势项,并采用Jiles-Atherton磁滞模型表征非晶合金和取向硅钢的非线性磁化特性,从而建立考虑磁滞效应的组合铁心双非线性电路-磁路耦合模型;最后,基于该耦合模型,求解组合铁心的励磁电流、磁通密度分布和空载损耗,通过与实测结果进行对比,验证所提方法的准确性。

Amorphous alloy and oriented silicon steel composite core can combine the advantages of traditional pure amorphous alloy and pure oriented silicon steel cores,which has a broad application prospect in the domain of distribution transformer core.Analysis of the excitation characteristics of the composite core containing two nonlinear soft magnetic materials is a prerequisite for optimal design of its structure.First,the equivalent circuit model of the composite core under the open circuit excitation condition is established,and its circuit voltage equation is written according to Kirchhoff's second law.Then,the equivalent dual nonlinear magnetic circuit model is established according to the structural features of the composite core,and its magnetic circuit equations are written based on the principle of continuity of magnetic flux and Ampere's circuital law.Again,the magnetic circuit equations are coupled to the magnetomotive force term in the circuit voltage equation according to the derivative transformation,and the Jiles-Atherton hysteresis model is used to characterize the nonlinear magnetization characteristics of amorphous alloy and oriented silicon steel,and thus a dual nonlinear circuit-magnetic coupling model is established for composite core considering hysteresis effect.Finally,based on this proposed coupling model,the excitation current,flux density distribution and no-load loss of the composite core are solved,and the accuracy of the proposed method is verified by comparing with the experimental results.