摘要
为研究复杂环境下半波长输电线路沿线电压和电流分布情况，建立了精细化传输线模型，它基于多导体传输线理论，提出分段建模的办法，并综合考虑复杂环境求解线路分布参数，通过链参数矩阵级联各分段线路。结合某特高压线路参数和分段情况，分析了土壤电阻率、邻近线路、负载阻抗和线路混合架设对半波长输电线路沿线电压、电流和功率分布的影响。结果表明，土壤电阻率在半波长输电线路三相不对称运行下对其有影响；邻近线路对半波长输电线路的影响与其长度、接近距离和位置有关；负载阻抗越小，半波长输电线路沿线的最大电压越大；线路混合架设对半波长输电线路的影响与混合线的占比和位置有关，占比越高，沿线电压和电流波动越大。详细分析证明弧垂系数I／3仍适用于半波长输电线路，故而需要考虑复杂环境对半波长输电线路建立精细化传输线模型。
The refined transmission line model was used to study the distribution of voltage and current along the half wavelength transmission lines under complicated environments. Based on the multiconductor transmission line theory, a piecewise modeling method was proposed. Considering the complicated environments, the distribution parameters of the line are solved, and each section of the circuit was connected in series through the chain parameter matrix. Combined with some UHV line parameters and segments, the influences of the soil resistivity, adjacent line, load impedance and hybrid transmission line on distribution of voltage, current and power along the half wavelength transmission line were analyzed. The calculation results show that the soil resistivity will affect the half wavelength transmission lines in the three-phase asymmetric operation of the lines. The influences of adjacent lines on the half wavelength transmission lines are related to their length, distance, and location. The ：smaller the load impedance is, the greater the maximum voltage along the half wavelength transmission lines is. The influence of hybrid transmission lines on the half wavelength transmission line is related to the proportion and location of the mixed lines. And the voltage and current fluctuations along the line is greater if the proportion is higher. Through detailed analysis, the sag coefficient 1/3 is still suitable for half wavelength transmis- sion lines. So it is necessary to consider complicated environment and establish a refined transmission line model for half wavelength line.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2018年第1期3-13,共11页
High Voltage Engineering
基金
国家电网公司科技项目(SGXJDK00DJJS1600151)~~
关键词
半波长
精细化
传输线
模型
链参数
half-wavelength
refined
transmission line
model
chain parameter
