柔性直流输电换流阀阀塔电场分布与结构设计研究

Electric field distribution and structural design of a converter valve tower in a VSC-HVDC transmission system

为研究高压柔性直流输电换流阀阀塔不同结构设计时表面电场分布情况,采用有限元ANSYS对换流阀阀塔静电场进行仿真计算。首先分析了顶部均压环在不同管径下的电场分布情况,各管径下顶部均压环电场分布近似,顶部均压环拐角内侧可不添加小型均压环。然后研究了板状屏蔽罩与管状屏蔽罩的电场分布,两种屏蔽系统下对阀塔均有良好的屏蔽能力,板状屏蔽系统略好于管状屏蔽系统。最后分析了阀塔底部法兰电场分布,该分布主要集中在其相连接斜拉绝缘子鼓包处。该研究为后续高压柔性直流输电换流阀阀塔设计提供了准确的设计思路及详细的参考方向。

To study the surface electric field distribution of a converter valve tower in different structural designs in the VSC-HVDC transmission system,the electrostatic field of a converter valve tower is simulated using finite element ANSYS.First,the electric field distribution of the corona ring on the top is analyzed at different pipe diameters.It turns out to be similar under each pipe diameter,and there is no need to add a small corona ring inside the corner of the top corona ring.Then the electric field distribution of the plate and tubular shields is also studied.The two shielding systems both have good shielding ability to the valve tower,and the plate shielding system is slightly better than the tubular.Finally,the electric field distribution of the flange at the bottom of the valve tower is analyzed.The field is mainly concentrated at the bulge of the diagonal insulator connected to it.It provides accurate design ideas and detailed reference directions for the subsequent design of a converter valve tower in a VSC-HVDC transmission system.