±800 kV特高压直流输电线路结构参数对地面可听噪声影响的定量研究

在特高压直流工程中,输电线路下方的可听噪声水平是一个基本的环境考核指标。介绍了目前5种高压直流线路的可听噪声预测公式,通过将计算结果与向家坝-上海±800 kV输电线路下方的可听噪声实测数据进行对比,得出EPRI预测公式能较好地适用于中国特高压直流线路可听噪声的预测。基于该公式,分析了不同导线结构对±800 kV直流线路可听噪声的影响规律,通过对比得出了导线分裂数是影响线路可听噪声的最主要因素。当电压恒定为±800 kV时,导线分裂数从4到8每增加2,参考点处的可听噪声减小10 dB（A）左右;当导线表面电场一定时,分裂数每增加2,参考点处的可听噪声增加2 dB（A）左右。

Quantitative Research on the Ground Audible Noise Influenced by ±800 kV UHVDC Transmission Lines’ Structure Parameters

For UHVDC projects, the audible noise level is a basic indicator for electromagnetic environment assessment. Five different audible noise prediction formulas used in the DC transmission lines were introduced in this paper, By comparing the measured noise data of the Xiang Jiaba-ShangHai ±800 kV transmission project with the calculated results, it was concluded that the EPRI formula is better suitable for predicting the audible noise of UHVDC transmission lines in our country. Based on this formula, the impacts of different conductor structures on the audible noise were analyzed, and it was found that the conductor’s bundle number is the key factor that impacts the audible noise. With the voltage keeping at ±800 kV, the audible noise at the reference point decreases by 10 dB(A) when the bundle number increases by 2 from 4 to 8; With the surface electric field keeping constant, the audible noise increases by 2 dB (A) when the bundle number increases by every 2.