Abstract
The ionized field should be controlled in order to insure the environmental friendliness of high voltage direct current (HVDC) transmission lines. Different with traditional HVDC transmission lines, the metal return lines is first employed in Zhangbei ±500kV flexible HVDC lines. In this paper, the characteristics of ionized field with and without metal return lines are calculated on the basis of numerical method with Deutsch’s assumption. The influence factors, i.e. roughness coefficient, distance between metal return line and height of the metal return line, are analysed in detail. The results show that the metal return lines will have a shield effect on the ionized field on the ground. The distribution of ionized field is nearly independent on the height of metal return line. The shielding effect of the metal return line mainly contributes to the projection position of the metal return line. The presented results can give instructions for the design and control of the ionized field level of flexible HVDC lines with metal return lines.
Highlights
The voltage source converter (VSC) based direct current (DC) transmission technology, which can be called as the flexible direct current transmission technology, has become a hot topic with the large application of the renewable energy in power grid [1]
The first high voltage DC grid in the world, i.e. the±500 kV flexible direct current grid demonstration project in Zhangbei are constructing in China [2]
In order to insure the economy of the construction of high voltage DC transmission lines, the corona discharge can be permitted as long as the corona discharge is limited at a relatively low level
Summary
The voltage source converter (VSC) based direct current (DC) transmission technology, which can be called as the flexible direct current transmission technology, has become a hot topic with the large application of the renewable energy in power grid [1]. The first high voltage DC grid in the world, i.e. the±500 kV flexible direct current grid demonstration project in Zhangbei are constructing in China [2]. This project can play important roles in comprehensive consumption of the renewable energy, i.e. wind and solar power. The influences of the corona onset voltage and structures of polar conductor and metal return line on the distributions of total electric field and ion current density are analysed. The presented results can give instructions for the optimal design and environment friendly of the flexible DC transmission lines
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