With the continuous development of HVDC transmission technology

the operation reliability of UHVDC filter capacitor banks has gradually become the focus of attention. Its electric field distribution is one of the main influencing factors

the surface electric field intensity needs to be studied and verified. In this paper

the large finite element analysis software ANSYS is used to set up the simulation model of the UHV DC filter capacitor bank of ±800 kV converter station and perform the simulation calculation and analysis of the surface electric field intensity. The corona inception field intensity is compared with the simulation value to judge whether the capacitor bank can produce corona discharge. The simulation results show that the maximum electric field intensity of each metal part of the capacitor bank is less than the initial field intensity

and the capacitor bank will not produce corona discharge. The simulation results also show that the maximum electric field intensity of each metal part is located at the corner

so the electric field intensity of each metal part can be optimized by adjusting the curvature radius of the corner.