高压直流输电线离子流场及附近绝缘子状态研究
发布时间：2018-09-18 09:06
【摘要】：随着我国高压直流输电工程的快速发展,国内?500kV超高压直流输电技术已广泛应用,?800kV特高压直流输电线路也已投入运行。绝缘问题是特高压直流输电最为核心的关键问题,由于高压直流输电存在由离子流场产生的大量空间电荷对绝缘子沿面闪络存在较大影响,因此直流输电线路绝缘子设计时需要对其进行考虑。本文研究了直流输电线路离子流场数值计算方法,并利用上流元法对直流输电线路离子流场进行数值计算求解,同时分析了特定条件下直流输电离子流场的空间电荷分布,对绝缘子运行参数的影响。本文首先通过对离子流场的理论分析,根据麦克斯韦方程推导离子流场的数学模型及边界条件,并利用上流元方法中来解决迭代求解流程中可能出现的不收敛问题,使得迭代过程能够较快完成;然后采取有限元方法来求解数学模型;最后采用matlab编写程序实现功能,通过与同轴圆柱结构的解析解的对比来验证该计算方法的有效性,实现上流有限元方法求解直流输电线路的地面合成电场及空间离子流密度。本文分析了风速、导线高度、导线电压等级对离子流场的影响,结果表明:导线高度、电压等级对地面附近离子流影响较大;同时空间电荷对绝缘子表面电场及电压分布也存在一定影响。本文的研究成果可以为高压直流输电工程的电磁环境评估提供基础,同时可以进一步对高压直流线路绝缘子在复杂大气条件下的闪络研究提供指导。
[Abstract]:With the rapid development of HVDC project in China, the UHV HVDC transmission line of 500kV has been widely used in China. Insulation is the key problem of UHV HVDC transmission. Due to the existence of a large number of space charges generated by ion current field in HVDC transmission, the flashover of insulators is greatly affected. Therefore, it is necessary to consider the insulator design of HVDC transmission line. In this paper, the numerical calculation method of ion current field of HVDC transmission line is studied, and the numerical solution of ion flow field of HVDC transmission line is obtained by using upper current element method. The space charge distribution of ion flow field in HVDC transmission line is also analyzed under certain conditions. The influence on the operation parameters of insulator. In this paper, through the theoretical analysis of ion flow field, the mathematical model and boundary conditions of ion flow field are derived according to Maxwell's equation, and the non-convergence problem that may occur in the iterative solution process is solved by using the upper current element method. The iterative process can be completed quickly, and then the finite element method is adopted to solve the mathematical model. Finally, matlab is used to write a program to realize the function. The validity of the method is verified by comparing with the analytical solution of the coaxial cylindrical structure. The upper current finite element method is realized to solve the ground synthetic electric field and the spatial ion current density of HVDC transmission lines. In this paper, the influence of wind speed, wire height and conductor voltage grade on the ion flow field is analyzed. The results show that the wire height and voltage grade have great influence on the ion current near the ground. At the same time, space charge also affects the electric field and voltage distribution on the surface of insulator. The research results in this paper can provide a basis for the electromagnetic environment assessment of HVDC transmission projects, and also provide guidance for the study of the flashover of HVDC line insulators under complex atmospheric conditions.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM216
本文编号：2247435
[Abstract]:With the rapid development of HVDC project in China, the UHV HVDC transmission line of 500kV has been widely used in China. Insulation is the key problem of UHV HVDC transmission. Due to the existence of a large number of space charges generated by ion current field in HVDC transmission, the flashover of insulators is greatly affected. Therefore, it is necessary to consider the insulator design of HVDC transmission line. In this paper, the numerical calculation method of ion current field of HVDC transmission line is studied, and the numerical solution of ion flow field of HVDC transmission line is obtained by using upper current element method. The space charge distribution of ion flow field in HVDC transmission line is also analyzed under certain conditions. The influence on the operation parameters of insulator. In this paper, through the theoretical analysis of ion flow field, the mathematical model and boundary conditions of ion flow field are derived according to Maxwell's equation, and the non-convergence problem that may occur in the iterative solution process is solved by using the upper current element method. The iterative process can be completed quickly, and then the finite element method is adopted to solve the mathematical model. Finally, matlab is used to write a program to realize the function. The validity of the method is verified by comparing with the analytical solution of the coaxial cylindrical structure. The upper current finite element method is realized to solve the ground synthetic electric field and the spatial ion current density of HVDC transmission lines. In this paper, the influence of wind speed, wire height and conductor voltage grade on the ion flow field is analyzed. The results show that the wire height and voltage grade have great influence on the ion current near the ground. At the same time, space charge also affects the electric field and voltage distribution on the surface of insulator. The research results in this paper can provide a basis for the electromagnetic environment assessment of HVDC transmission projects, and also provide guidance for the study of the flashover of HVDC line insulators under complex atmospheric conditions.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75;TM216
【参考文献】
相关期刊论文 前10条
1 杨勇;陆家榆;雷银照;;同走廊双回直流线路地面合成电场计算[J];电网技术;2009年19期
2 杨勇;陆家榆;雷银照;;同塔双回高压直流线路地面合成电场的计算方法[J];中国电机工程学报;2008年06期
3 田冀焕;邹军;刘杰;袁建生;;高压直流双回输电线路合成电场与离子流的计算[J];电网技术;2008年02期
4 于永清;李光范;宿志一;陆家榆;孙麟;范建斌;;特高压直流试验基地建设[J];中国电力;2006年10期
5 李自品;段开洪;刘生琳;熊宜栋;;基于子模型法的330 kV线路绝缘子串电压分布计算[J];武汉大学学报(工学版);2006年01期
6 江汛,王仲奕,金强;棒形悬式复合绝缘子电场计算和优化[J];高压电器;2005年05期
7 沈鼎申,张孝军,万启发,阮江军;750kV线路绝缘子串电压分布的有限元计算[J];电网技术;2003年12期
8 周浩,孙志锋,李升华;多重网格法在HVDC线路离子流场数值计算中的应用[J];高电压技术;1993年01期
9 周浩,张守义;HVDC输电线路离子流场比例模型理论的推导与验证[J];高电压技术;1992年02期
10 傅宾兰;高压直流输电线路电晕特性参数测量[J];高电压技术;1989年04期
，本文编号：2247435
本文链接：https://www.wllwen.com/kejilunwen/dianlidianqilunwen/2247435.html
