Numerical Calculation Of Total Electric Field Of UHVDC Transmission Lines And Analysis Its Influence Factor

With the rapid development of China's economy,the demand for electricity from all walks of life is increasing,but the distribution of China's power resources is extremely uneven.The power generation end is concentrated in the west of China and the power consumption end is concentrated in the east of China.UHVDC transmission has the characteristics of long transmission distance,large capacity,and small circuit loss,so the construction of UHVDC transmission lines is an effective measure to solve the uneven distribution of power resources in China.However,when the UHVDC transmission line is in operation,the electric field on the surface of the wire exceeds the corona electric field to cause corona phenomenon,which causes electromagnetic environment problems.The existence of the electromagnetic environment will affect the surrounding environment,in which the synthetic electric field is the main component of the electromagnetic environment,but the numerical calculation of the synthetic electric field is affected by many factors,such as wire height,wire splitting number,wind speed,temperature and humidity.In order to improve the calculation accuracy and efficiency,this paper did the following research:First: Summarize the existing calculation methods of synthetic electric field,and improve the calculation method of synthetic electric field.An adaptive compensation charge method is proposed to calculate the nominal electric field in the synthetic electric field;a flux line-upwind difference method is proposed to calculate the ion current field in the synthetic electric field.Finally,comparison with literature data verifies the effectiveness of the algorithm.Second: The synthetic electric field under the influence of different factors was analyzed and calculated,and the distribution of the synthetic electric field and ion current field of the UHVDC transmission line under the influence of wire height,pole spacing,wire splitting number,wind speed,temperature,humidity,and particulate matter were obtained.Characteristic law.Finally,for the problem that the installation of UHV DC transmission lines is easy to pass through the jungle,a simplified simulation model is established by the software Comsol,and the influence of the shape,number,height and location of trees on the combined electric field is analyzed,which provides a certain reference for the actual transmission line installation.