Improved Method of Power Loss and Electric Field Calculations of HVAC Transmission Lines  

作　　者：DU Zhiye RUAN Jiangjun JIN Shuo HUANG Guodong ZHU Lin 

机构地区：[1]School of Electrical Engineering, Wuhan University, Wuhan 430074, China

出　　处：《高电压技术》2013年第10期2365-2371,共7页High Voltage Engineering

基　　金：supported by National Basic Research Program of China(973 Program)(2011CB209404)

摘　　要：An improved method for calculating the corona power loss and the ground-level electric field on HVAC transmission lines induced by corona is proposed.Based on a charge simulation method combined with a method of successive images,the proposed method has the number and location of the simulated charges not arbitrary.When the surface electric field of a conductor exceeds the onset value,charges are emitted from corona into the space around,and the space ions and the surface charges on each sub-conductor are simulated by using the images of the other sub-conductors.The displacements of the space ions are calculated at every time step during corona periods in both the positive and the negative half cycles.Several examples are calculated by using the proposed method,and the calculated electric field at the ground level and the corona power loss agree well with previous measurements.The results show that simulating 12 charges in each conductor during 600 time steps in one cycle takes less time while guarantees the accuracy.The corona discharge from a 220 kV transmission line enhances slightly(less than 2%) the electric field at the ground level,but this effect is little from a 500 kV line.The improved method is a good compromise between the time cost and the accuracy of calculation.An improved method for calculating the corona power loss and the ground-level electric field on HVAC transmission lines in- duced by corona is proposed. Based on a charge simulation method combined with a method of successive images, the proposed method has the number and location of the simulated charges not arbitrary. When the surface electric field of a conductor exceeds the onset value, charges are emitted from corona into the space around, and the space ions and the surface charges on each sub-conductor are simulated by using the images of the other sub-conductors. The displacements of the space ions are calculated at every time step during corona periods in both the positive and the negative half cycles. Several examples are calculated by using the proposed method, and the calculated electric field at the ground level and the corona power loss agree well with previous measurements. The results show that simulating 12 charges in each conductor during 600 time steps in one cycle takes less time while guarantees the accuracy. The corona discharge from a 220 kV transmission line enhances slightly （less than 2%） the electric field at the ground level, but this effect is little from a 500 kV line. The im- proved method is a ~ood comoromise between the time cost and the accuracy of calculation.

关 键 词：位移计算 表面电场 功率损耗 输电线路 HVAC 模拟电荷法 500千伏线路 电晕放电 

分 类 号：TM726[电气工程—电力系统及自动化] O342[理学—固体力学]