云南-广东±800kV特高压直流输电线路可听噪声仿真计算与测试分析

Simulation Calculation and Measurement Analysis of Audible Noise for ±800 kV Yunnan-Guangdong UHVDC Transmission Lines

为研究特高压直流(UHVDC)输电线路可听噪声特性及环境影响,对±800kV云南-广东(简称云广)直流线路可听噪声进行了理论计算和测量分析。基于特高压直流输电线路导线表面最大电场计算的简化模型和BPA经验公式进行了可听噪声的理论计算。结合云广工程特点阐述了特高压直流输电线路可听噪声的测量环境、位置、时间、注意事项、数据记录、评价值与分析依据。将理论值与现场测量值进行比较分析可得:在正极半压和负极全压、负极半压、负极全压运行方式下可听噪声的测量值呈振荡性;不同月份的双极全压运行方式下可听噪声的测量值与理论值的误差明显小于正极半压和负极全压、负极半压、负极全压运行方式下所得到的误差。云广特高压直流线路可听噪声的测量值在海拔高度700m处的双极之间受周围植被影响而使得测量值偏小,其他海拔高度测量点的可听噪声分布均以最大值为中心、沿垂直于导线方向的两侧分布呈衰减趋势。在不同海拔高度下,双极全压运行的云广直流线路可听噪声的测量值满足噪声电磁环境限值。

Simulation calculation and measurement analysis on audible noise （AN） in the ±800 kV Yunnan- Guangdong （YG） DC transmission line were performed for the purpose of obtaining the characteristics and environment effect from UHVDC transmission lines. Based on a simplified model of the UHV conductor surface max electric field and the BPA experience formula, a theoretical calculation method of AN was put forward, and then AN of the line was calculated. Combined with the characteristics of YG project, requirements for the AN measurement in aspects of environment, location, time, notes, data records, evaluation, and analysis method were proposed. Comparative analyses between the theoretical calculation and measurements of the AN demonstrate that a concussion trend under operation conditions of the half-voltage positive pole and full-voltage, hal^voltage, and full- voltage negative pole can be obtained. AN error between the theoretical calculation and measurement from full voltage of bipolar for different months reaches its minimum in comparison to that of half-voltage positive pole and full-voltage, half-voltage negative pole and full-voltage negative pole. Furthermore, the AN distribution according to measurement locations perpendicular to YG UHVDC transmission lines shows an attenuation trend from a peak value to both ends, a smaller measurement value is obtained at the location with an altitude of 700 m due to the influence of the surrounding plants. It is concluded that the AN of YG UHVDC transmission lines at different altitudes is within the standard limits.