基于特高压直流线路电晕电流与可听噪声关联规律的可听噪声间接检测法研究

The audible noise from UHV DC transmission line has serious adverse effects on people's health and life. It is necessary to carry out the relevant detection to characterize audible noise based on which the optimal design of transmission line can be accomplished. In order to solve the issue on the difficulty of existing direct detection method to obtain the accurate test date in outdoor conditions, this project has proposed a new methodology to evaluate audible noise indirectly based on the correlation between corona current and audible noise: Firstly, on the basis of previous research findings on “relationship between corona current and A-level of audible noise”, this project plans to further study the statistical correlation relationship between spectrum of corona current and that of audible noise under the influences of multiple factors. Then, throughout analysis of the associated role which corona current plays in the generating process of audible noise, the theoretical correlation model between spectrum of corona current and that of audible noise will be constructed, and the intrinsic correlation mechanism between the two physical quantities will be revealed. Thus, the correlation relationship between corona current and audible noise can be revealed both statistically and theoretically. Finally, using the discovered correlation relationship, a method to assess the audible noise indirectly based on the measured corona current will be studied. Through the study of this project, the difficulty of the direct measurement of audible noise will be solidly solved, and it can also be considered as a complementary method to the traditional direct method. At the same time, the obtained correlation can enhance the development of DC corona effect theory, and provide valuable support to the design of UHV DC transmission line.

特高压直流线路的可听噪声会对人的健康和生活带来严重不利影响，对其进行检测是研究其特性进而实现线路优化设计的重要基础。针对现有可听噪声检测方法（直接法）“在户外复杂环境下难以获得准确测量值”的瓶颈问题，本项目拟探索一种基于电晕电流与可听噪声关联规律，间接检测可听噪声的新方法：拟在前期获得的“电晕电流与可听噪声A声级关联规律”的基础上，进一步研究多因素影响下电晕电流频谱与可听噪声频谱的统计关联规律；通过分析电晕电流在可听噪声产生过程中所起的关联作用，建立电晕电流频谱与可听噪声频谱的理论关联模型，揭示两者之间的内在关联机理，进而从统计和机理研究两个角度揭示二者之间的关联规律；基于所获得的关联规律，探索利用电晕电流测量值实现可听噪声间接检测的方法。通过本项目研究，可望有效解决现有检测方法存在的难题，与其形成互补。同时，所获得的关联规律可进一步完善直流电晕特性理论，为合理设计特高压直流线路提供依据。

特高压直流输电技术具有传输距离远、效率高等优点，发展特高压直流输电技术解决我国能源资源分布不均问题的重要手段。但特高压直流线路的可听噪声会对人的健康和生活带来严重不利影响，对其进行检测是研究其特性进而实现线路优化设计的重要基础。本项目针对现有可听噪声检测方法“在户外复杂环境下难以获得准确测量值”的瓶颈问题，探索了一种基于电晕电流与可听噪声关联规律间接检测可听噪声的新方法。具体所做的主要工作如下：.（1）电晕电流频谱与可听噪声的统计关联规律研究。本项目在相对安静的环境下，对晴天时正极性导线的电晕电流和可听噪声进行了长期的监测实验，通过对试验数据进行统计分析，获取了可听噪声频谱和A声级随着电晕电流频谱变化而发生变化的关联规律，并建立了可听噪声与电晕电流在频域的统计关联关系式。.（2）电晕电流频谱与可听噪声频谱的关联机理研究。通过分析电晕电流在可听噪声产生过程中所起的关联作用，本项目建立了电晕电流频谱与可听噪声频谱的理论关联模型，实现了以总电晕电流频谱分量为参量的空间任意点可听噪声频谱的数学表征，进而从统计和机理研究两个角度揭示二者之间的关联规律；.（3）基于电晕电流间接检测可听噪声的方法研究与实验验证。基于所获得的电晕电流与可听噪声之间的关联规律，提出了四种由电晕电流数据获得可听噪声数据的方法。通过对比所提出的各种方法，本项目选择了其中的最优方法作为可听噪声间接检测法，并提出了可听噪声间接检测法的步骤及其实现方法。最后，本项目对所提出的方法和实现方案进行实验验证，并对检测结果进行了分析。.基于上述工作，共获得各类成果共19项，当中培养硕士生4名，博士生1名，发表学术论文8篇，其中SCI检索论文6篇，EI检索论文1篇，中文期刊论文1篇；申请发明专利3项（其中2项已授权），软件著作权1项。上述工作可为探究电晕放电原理、实现可听噪声的准确测量以及特高压电线路的优化设计提供理论支撑和技术手段。