直流接地极运行方式调整过程对变压器直流偏磁影响的研究  

Study on Influence of Operation Mode Adjustment of DC Grounding Pole on DC Magnetic Bias of Transformer

作　　者：刘烨 傅晨钊 赵文彬 吴兴旺 LIU Ye;FU Chenzhao;ZHAO Wenbin;WU Xingwang(College of Electric Power Engineering,Shanghai University of Electric Power,Shanghai 200090,China;State Grid Electric Power Research Institute,SMEPC,Shanghai 200437,China;Power Science Research Institute of State Grid Anhui Power,Hefei 230031,China)

机构地区：[1]上海电力大学电气工程学院,上海200090 [2]国网上海电力科学研究院,上海200437 [3]安徽省电力有限公司电力科学研究院,合肥230031

出　　处：《高压电器》2021年第12期110-116,124,共8页High Voltage Apparatus

摘　　要：针对交流电网变压器直流偏磁评估偏差较大的问题,文中考虑直流系统暂态功率转移控制策略的影响,通过场路耦合的方法,建立±1 100 kV古泉直流接地极运行方式调整时直流偏磁仿真分析模型。计算接地极运行方式调整过程中,不同土壤模型和距离接地极不同距离时地表电位的变化,评估了变压器励磁特性的响应情况。结果表明:直流接地极运行方式调整过程,对邻近深层土壤高电阻率地区影响较大,引起的直流偏磁现象最为严重。随着距接地极距离的增加,地表电位受接地极运行方式调整的影响减小,当距离大于10 km时基本可以忽略。文中根据仿真结果提供了一种直流偏磁评估方法,为直流接地极运行方式调整过程中的变压器直流偏磁评估提供参考。In view of large DC magnetic bias evaluation deviation of AC power network transformers,the influence of transient power transfer control strategy of DC system is considered in this paper and the DC magnetic bias simulation analysis model in the adjustment of operation mode of±1100 kV Guquan DC grounding pole is set up through the field-path coupling method.The change of surface potential in different soil models and different distances from the ground electrode are calculated during the adjustment of operation mode of grounding pole and the response of transformer excitation characteristics is evaluated.The results show that the adjustment process of the operation mode of the DC grounding pole has a great influence on the adjacent deep soil with high resistivity,and the DC magnetic bias is the most serious.With the increase of distance from the ground pole,the influence of the ground potential on the operation mode of the ground pole decreases which,in case of distance of more than 10 km,can be basically ignored.The simulation result in this paper provides a kind of DC magnetic bias evaluation method in accordance with the simulation result,which provides a reference for DC magnetic bias evaluation of transformer during the operation mode adjustment of DC grounding pole.

关 键 词：直流输电 调整过程 暂态功率 直流偏磁 励磁特性 

分 类 号：TM721.1[电气工程—电力系统及自动化] TM41