纳米晶铁心中频变压器磁-结构场耦合数值模拟  

Magnetic-structural Field Coupling Numerical Simulation of Medium-frequency Transformer with Nanocrystalline Core

作　　者：陈彬 席彬晟[1,2] 李学宝 万妮娜 唐波 CHEN Bin;XI Binsheng;LI Xuebao;WAN Nina;TANG Bo(Hubei Provincial Engineering Technology Research Center for Power Transmission Line,Hubei Yichang 443002,China;College of Electrical Engineering and New Energy,China Three Gorges University,Hubei Yichang 443002,China;College of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China;Yichang Electric Company,State Grid Hubei Electric Power Company,Hubei Yichang 443002,China)

机构地区：[1]湖北省输电线路工程技术研究中心,湖北宜昌443002 [2]三峡大学电气与新能源学院,湖北宜昌443002 [3]华北电力大学电气与电子工程学院,北京102206 [4]国网湖北省电力有限公司宜昌供电公司,湖北宜昌443002

出　　处：《高压电器》2024年第1期172-181,204,共11页High Voltage Apparatus

基　　金：国家自然科学基金青年科学基金(52107006);湖北省教育厅科学技术研究项目(Q20201202);湖北省输电线路工程技术研究中心开放课题(2019KXL02)。

摘　　要：中频变压器是高压大容量直流变换器的核心元件,但高频率、高功率密度会导致变压器振动噪声加剧。为了精确模拟中频变压器的铁心振动特性,文中建立了中频变压器三维瞬态磁—结构场耦合分析计算模型,利用有限元法计算空载条件下铁心振动加速度和位移。结合纳米晶卷形铁心层合结构的特点,按照横观各向同性对纳米晶铁心的力学材料特性参数进行计算和赋值。搭建了壳式和芯式两种不同铁心拓扑结构的中频变压器仿真模型和实物模型,通过仿真和实验系统性地研究了气隙结构、铁心拓扑结构对中频变压器振动的影响。通过理论计算和实验结果的比较证实:铁心气隙表面处的麦克斯韦力是振动的主要原因,壳式中频变压器的最大麦克斯韦力密度(25257 N/m^(2))大于芯式中频变压器(20936 N/m^(2));壳式铁心的最大加速度(40 m/s^(2))大于芯式铁心(30 m/s^(2))且数值模拟的误差在10%以内。Medium-frequency transformer(MFT)is the core component of high voltage and large capacity DC con-verter,but high frequency and high power density can aggravate vibration noise of transformer.In order to accurate-ly simulate the core’s vibration characteristics of MFT,a three-dimensional transient magnetic-structural field cou-pling analysis and calculation model of MFT is set up and the core’s vibration acceleration and displacement under no-load condition by using finite element method is calculated.The mechanical material parameters of nanocrystal-line iron core are calculated and assigned in combination with the characteristics of the laminated structure of nano-crystalline rolled iron core and in accordance with the transversely isotropic.Both simulation model and true model of shell-type and core-type MFTs with different core topologies are set up,and the influence of air gap structure and core topology on the vibration of MFT is systematically studied by simulation and experiment.It is proved through the comparison of theoretical calculation and experimental results that the Maxwell force on the air gap surface of the core is the main cause of vibration,and the maximum Maxwell force density of the shell-type MFT(25257 N/m^(2))is larger than that of the core⁃type MFT(20936 N/m^(2)).The maximum acceleration of shell⁃type(40 m/s^(2))is larger than that of core⁃type(30 m/s^(2)),and the numerical simulation error is within 10%.

关 键 词：中频变压器 铁心振动 磁致伸缩 麦克斯韦力 振动加速度 

分 类 号：TM432[电气工程—电器]