±1100 kV特高压直流换流阀用饱和电抗器的铁损及温度分布仿真  

Simulation Study on Iron-core Loss and Temperature Distribution of Saturable Reactor for ±1100 kV UHVDC Converter Valves

作　　者：米彦[1] 邓胜初 桂路 欧阳文敏 姚陈果[1] 李成祥 MI Yah;DENG Shengchu;GUI Lu;OUYANG Wenmin;YAO Chenguo;LI Chengxiang(School of Electrical Engineedng,Chongqing University,Chongqing 400030,China;State Key Laboratory of Advanced Power Transmission Technology,Beijing 102209,China)

机构地区：[1]重庆大学电气工程学院,重庆400030 [2]先进输电技术国家重点实验室,北京102209

出　　处：《高电压技术》2018年第10期3359-3367,共9页High Voltage Engineering

基　　金：国家创新研究群体基金(51321063);先进输电技术国家重点实验室开放基金(GEIRI-SKL-2017-006)~~

摘　　要：为了研究饱和电抗器内部铁芯损耗和温度分布规律,首先基于有限元分析法,在ANSYSMaxwell软件中建立了饱和电抗器的仿真模型,在保证计算精度的同时减少计算时间。然后导入5 000 A满负荷工况下的瞬时电流数据进行仿真计算,得到了整流侧换流阀用饱和电抗器铁芯损耗瞬时功率波形和损耗功率密度分布;最后,将铁损密度分布作为温度场分析的载荷,并结合ANSYSWorkbench软件建立了饱和电抗器的电磁热耦合仿真模型,对铁芯的空间温度分布规律进行了仿真。仿真结果表明：靠近气隙和两端处的铁芯损耗高于中间,左侧的铁芯损耗密度高于右侧;铁芯两端温度高,中间温度低;靠近绕组侧的铁芯温度比远离绕组侧的铁芯温度高,最热点温度为107℃。因此,贴近铁芯两端的环氧树脂为运行的绝缘薄弱点,研究结果可以为环氧树脂局部薄弱点的老化绝缘寿命评估和饱和电抗器的散热设计提供参考。In order to analyze the core loss and temperature distribution of the saturable reactors, firstly, we established a simulation model of saturable reactor in ANSYS Maxwell software based on the finite element analysis, which can reduce the calculation time and ensure the calculation accuracy. Then, the instantaneous power waveform and power density distribution of the normal operating saturation reactor at the rectifier valve side were simulated by importing the instantaneous current data of 5 000 A under full load condition into the model. Finally, taking the density distribution of core loss as the load of temperature field analysis, we established an electromagnetic thermal coupling simulation model of the saturable reactors in ANSYS Workbench software and simulated the law of temperature distribution of core loss. The simulation results show that the core loss near the air gap and at both ends is higher than that in the middle, and the left side is higher than the right. The temperature of the core at both terminals is higher than that at the middle, and the temperature of core near the winding side is higher. The hottest point of the core near the terminal is 107 ℃. Thus, the epoxy resin close to both ends of core is weak. The research results can provide references for the insulation life aging evaluation of local weak points in epoxy resin and the thermal design of saturable reactors.

关 键 词：换流阀 饱和电抗器 铁芯损耗 温度分布 有限元仿真 电磁热耦合 

分 类 号：TM47[电气工程—电器]