Surface Electric Field Calculation and Structure Parameters Configuration of Converter Valve Fittings on Offshore Converter Platform

In order to optimize the insulation design and layout of the valve hall of the offshore converter platform. Taking a flexible converter valve tower of ± 500 kV/3000 MW offshore wind power as an example, the mixed AC and DC electric fields of the converter valve tower were calculated by finite element method. The electric field distribution on the surface of the valve tower was given, and the weak insulation positions were located. The effect of distance between the valve tower and wall, distance between valve towers and size parameters of the fixture on surface field strength were studied with the design goal of no corona generated on the surface of the fittings and the limit of corona inception field strength. The results showed that the edge of the shield cover of the converter valve tower and the pressure equalizing ring of the insulator are in weak insulation positions. The distance between the valve tower and the wall, the distance between the valve towers and the size parameters of the fittings could significantly affect the distribution of the electric field on the valve tower surface. On this basis, the valve tower fittings parameters selection and valve tower position configuration scheme were proposed.