Research of HVDC Power Transmission Impacts of Air Ion Current Density and Ionized Field Based on New Power System

Abstract

In 2022, the construction process of new power system will be comprehensively accelerated, which will provide key support for achieving green and low-carbon energy sources.In order to achieve the above goals, it is necessary to further explore the HVDC power system transmited. In the process of HVDC transmission, the synthetic magnitude field and the density of ion current,may finally due to the distribution of DC lines are affected by ion mobility. In order to investigate the exact influence, variations of the field and current distributions are calculated with different values of ionic mobility and corona inception field strengths because of pressure's changes. Temperature and humidity are unchanged. The governing equations of the ionized field are Poisson's equation and laplace equation transformation. The one-dimensional (1-D) ionized field which be the key part of alculation are in corona cage and the 2-D field of ±1100kV HVDC power lines. Calculation results show that under certain applied voltage, the strength and densityof ion current on corona cage surface may increase by 80% and 6 times respectively when ionic mobility rise by half and corona inception field strength decreases by 33 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> . The ionning field and ion current density that had impact on grounk, ±1100kV HVDC lines increase by half, then 1.5 times respectively when ionic mobility increase by 16% and corona inception field decreases by 16%.