温度分布不均匀对±500kV换流变压器二维非正弦稳态交直流复合电场的影响分析  

Influence of Non-uniform Temperature on the 2D Non-sinusoidal Steady AC-DC Compound Electric Field in ±500kV Converter Transformer

作　　者：刘刚[1] 池骋[1] 孙立鹏[1] 李琳[2] 马永强[1] 靳艳娇 LIU Gang;CHI Cheng;SUN Lipeng;LI Lin;MA Yongqiang;JIN Yanjiao(Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense （North China Electric Power University）, Baoding 071003, Hebei Province, China;State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources （North China Electric Power University）, Changping District, Beijing 102206, China)

机构地区：[1]河北省输变电设备安全防御重点实验室(华北电力大学),河北省保定市071003 [2]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《中国电机工程学报》2018年第8期2521-2529,共9页Proceedings of the CSEE

基　　金：国家重点研发计划项目(2017YFB0902703);国家自然科学基金项目(51407075);河北省自然科学基金项目(E2015502004);中央高校基本业务经费项目(2015 MS79)~~

摘　　要：为了分析温度分布不均匀对换流变压器非正弦稳态交直流复合电场的影响,该文采用一种单向耦合的方法,即首先建立±500k V换流变压器二维磁场仿真模型,计算得到铁心和绕组的损耗;其次,建立换流变压器二维流体-温度场仿真模型,并以磁场损耗为热源,利用流体仿真软件Fluent计算分析了热流耦合时的温度场分布;然后通过快速映射法把流体-温度场的温度结果映射到二维电场计算模型;最后通过标量电位的频域有限元方对比分析换流变压器在均匀温度假设和不均匀温度条件下的非正弦稳态交直流复合电场分析结果可为换流变压器的绝缘设计和故障分析提供指导。In order to investigate the impacts of the non-uniform temperature on the electric field distribution under non-sinusoidal steady state AC-DC compound voltage, a one-way coupled method was adopted in this paper. The losses of a ±500 k V converter transformer core and windings were calculated based on the electromagnetic model firstly. Then the 2 D fluid-thermal model of the converter transformer was established with the losses of the magnetic field as the heat sources, and the temperature distribution under normal condition was simulated by the CFD software, Fluent. Afterward, the node temperature data in the electric field model were interpolated into by the corresponding elements of the fluid-thermal model through the fast mapping method, and finally the compound AC-DC electric field under non-sinusoidal steady voltage at both uniform and non-uniform temperature distribution was calculated by the frequency domain finite element method with scalar potential. The results can provide a reference for insulation design and fault analysis of the converter transformer.

关 键 词：换流变压器 磁场 温度场 流体场 电场 频域有限元 

分 类 号：TM401[电气工程—电器]