雾霾天气对高压直流输电线路可听噪声影响研究

为研究雾霾对高压直流输电线路可听噪声的影响，提出了计及雾霾影响的高压直流输电线路可听噪声计算方法。首先，建立雾霾天气下高压直流输电线路离子流场的计算模型，考虑了不同雾霾等级对空间电荷、离子迁移率和起晕场强的影响，并给出了用离子流场模型计算导线表面最大电位梯度的流程；其次，分析了可听噪声与导体表面最大电位梯度的关联性；最后，结合分裂导线数、导线不同直径对可听噪声的影响，提出应用范围广泛的可听噪声预测公式，并分析了不同雾霾等级及不同雾霾颗粒物浓度与可听噪声的关系。以±800 kV直流输电线路为例，对其在雾霾天气下的可听噪声进行计算。结果显示，随着雾霾等级提高，可听噪声会随之增大。雾霾中颗粒物荷电是导致可听噪声增大的主要原因，其中PM2.5的影响程度最大。所提出的离子流场计算模型和可听噪声预测公式可推广应用于高压直流输电线路可听噪声评估中，具有较高的工程应用价值。

Study on the influence of haze weather on audible noise of HVDC transmission lines

To study the influence of haze on the audible noise of high-voltage direct current(HVDC)transmission lines,a calculation method with the influence of haze taken into account is proposed for prediction of the audible noise of HVDC transmission lines.Firstly,a calculation model of ionic flow field of HVDC transmission lines under haze weather was established,and the effects of different haze levels on space charge,ion mobility and halo field strength were taken into account.The process of calculating the maximum potential gradient on the conductor surface with the ionic flow field model was given.Next,the correlation between audible noise and the maximum potential gradient on the conductor surface was analyzed.Finally,combined with the effects of the number of split conductors and different diameters of conductors on audible noise,the prediction formula of audible noise with a wide range of applications was proposed,and the relationships between different haze levels and different haze particulate concentrations and audible noise were also analyzed.Taking the ±800 kV DC transmission line as an example,its audible noise under haze weather was calcula-ted.The results show that the audible noise increases as the haze level increases.The charge of particles in the haze is the main reason for the increase of audible noise,and PM2.5 is the most influencial factors.The proposed ion flow field calculation model and audible noise prediction formula can be popularized and applied to the assessment of audible noise in high-voltage direct current transmission lines with certain application value for the engineering.