高海拔地区交流输电线路可听噪声产生机理及预测方法研究

发布时间：2018-05-13 04:21

本文选题：交流输电线路 + 高海拔　；参考：《中国电力科学研究院》2017年硕士论文

【摘要】：随着我国超/特高压输电技术的快速发展和全球能源互联网解决方案的正式提出,大量的超/特高压输电线路将跨越高海拔地区。超/特高压交流输电线路的可听噪声预测技术是输变电工程电磁环境控制的关键技术之一。高海拔地区电晕放电剧烈,可听噪声更为明显。因此,研究高海拔地区交流输电线路的可听噪声特性,获得更为准确的可听噪声预测技术对保证高海拔地区交流输电线路建设的经济性和环境友好性至关重要。为此,论文从噪声产生机理和噪声预测方法两个方面对高海拔地区交流输电线路的可听噪声问题进行了研究,研究内容如下:噪声产生机理方面,利用电磁屏蔽室内小型电晕笼试验系统和BruelKjaer声学采集系统开展电晕声波脉冲特性试验研究,对缩尺模型导线上单个尖电极的噪声时域波形进行了测量,讨论了外加电压幅值对声波脉冲参数的影响规律。通过对比不同曲率半径尖电极电晕放电产生的噪声时域波形,获得了尖电极曲率半径对声波脉冲幅值以及脉冲重复频率的影响规律。噪声预测方面主要包括以下两部分内容。首先利用高海拔电晕笼试验平台对19种不同型式分裂导线进行了好天气下和大雨条件下的噪声试验研究,系统地研究了导线表面场强、子导线直径以及导线分裂数和对声功率的影响规律。并基于以上规律利用多元回归分析方法对试验获得的噪声数据进行了假设检验和分析拟合,初步建立了基于西宁海拔条件下的交流输电线路可听噪声预测方法。其次利用可移动式电晕笼对6种型式分裂导线开展了 7个不同海拔高度下的噪声试验研究,获得了海拔高度以及空气相对密度对声功率的影响规律。而后通过多元线性回归分析方法对试验测得数据进行了分析拟合,提出了基于多海拔实测数据下的交流输电线路声功率预测方法。通过将预测方法计算值与试验实测值进行对比分析,验证了本文所提预测方法的准确性。本文研究成果具有一定的理论意义和重要的工程应用价值,可以为高海拔地区交流输电线路声功率预测提供理论依据与技术支撑。
[Abstract]:With the rapid development of ultra-high voltage (UHV) transmission technology in China and the proposed global energy Internet solution, a large number of UHV transmission lines will span high altitude areas. The prediction technology of audible noise for UHV AC transmission lines is one of the key technologies for electromagnetic environment control in power transmission and transformation projects. At high altitude, the corona discharge is intense, and the audible noise is more obvious. Therefore, it is very important to study the characteristics of audible noise of AC transmission lines at high altitude and obtain more accurate prediction technology of audible noise to ensure the economy and environmental friendliness of AC transmission line construction at high altitude. Therefore, this paper studies the audible noise of AC transmission lines at high altitude from two aspects of noise generation mechanism and noise prediction method. The research contents are as follows: noise generation mechanism, Using the small corona cage test system and the BruelKjaer acoustic acquisition system in the electromagnetic shielding room, the corona acoustic pulse characteristics were studied, and the noise time domain waveform of a single tip electrode on the scale model wire was measured. The effect of applied voltage amplitude on acoustic pulse parameters is discussed. The effect of curvature radius of tip electrode on the amplitude of acoustic pulse and pulse repetition rate is obtained by comparing the noise time domain waveform generated by corona discharge of tip electrode with different curvature radii. Noise prediction mainly includes the following two parts. At first, the noise of 19 different types of split conductors under good weather and heavy rain were studied by using the high altitude corona cage test platform, and the surface field strength of the conductors was systematically studied. The influence of the diameter of the sub-conductor, the number of conductors splitting and the sound power. Based on the above rules, the noise data obtained from the experiment are tested and analyzed by using multiple regression analysis method, and a preliminary prediction method of audible noise of AC transmission line based on Xining elevation is established. Secondly, using movable corona cage, the noise of 6 types of split conductors is studied at 7 different altitudes, and the influence of altitude and relative density of air on sound power is obtained. Then, the experimental data are analyzed and fitted by multivariate linear regression analysis, and a method of acoustic power prediction for AC transmission lines based on the measured data at multiple elevations is proposed. The accuracy of the proposed prediction method is verified by comparing the calculated values with the experimental measured values. The research results in this paper have certain theoretical significance and important engineering application value, and can provide theoretical basis and technical support for the prediction of acoustic power of AC transmission lines in high altitude area.
【学位授予单位】：中国电力科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM75

【参考文献】