±1100kV特高压直流输电线路按电磁环境条件的导线设计

Conductor Design of ±1100 kV UHVDC Transmission Lines Based on Electromagnetic Environment Conditions

目前尚无对±1 100kV特高压直流(UHVDC)输电线路导线选型的系统研究成果。为此,从满足电磁环境要求的角度,对±1 100kV特高压直流输电线路的导线选型及分裂方式进行了研究。采用合成场强解析法、EPRI可听噪声计算法和CISPR无线电干扰计算法等国际公认的、经过实际工程验证且广泛使用的计算分析方法,研究了±1 100kV特高压直流输电线路的结构参数(分裂导线根数、子导线截面、导线分裂间距、极导线对地高度和极导线间距)对地面合成电场、电晕可听噪声和无线电干扰场强的影响,发现可听噪声是决定导线方式的主要因素。对满足电磁环境限值的不同导线方案进行了经济比较,根据电磁环境预测分析及经济比较结果可以得出,8分裂JL/G3A-1000/45型导线在满足电磁环境要求的同时年费用最小。因此提出±1 100kV特高压直流输电线路的导线采用8分裂JL/G3A-1000/45型导线的建议。

There is no well accepted reference for the conductor selection of±1 100 kV ultra high voltage direct current （UHVDC） transmission projects. Thus, based on the requirements of the electromagnetic environment, the conductor selection and its bundle structure for ±1 100 kV UHVDC transmission projects are studied. Adopting calculation and analysis methods that are internationally recognized, practically verified and widely used, including analytical method of synthesis field strength, EPRI calculation method of audible noise, and CISPR calculation method of radio interference, we studied influence of the structural parameters of the transmission lines on total ground electric fields, audible noise, and radio interference. These structure parameters include the splitting number, the sectional area of sub conductors, the splitting-wire spacing, the conductor elevation to the ground, and the pole conductor distance. It is found that audible noise is the main factor deterring the conductor scheme. Economic comparison is carried out with regard to different conductor schemes that meet the requirements of electromagnetic environment. According to the electromagnetic environment forecast analysis and the economic comparison results, it is concluded that the conductor pattern--JL/G3A-1000/45 with a splitting number of 8-- meets the electromagnetic environment requirements while having the lowest annual costs.