阅读说明：本技术 一种基于定频非同步采样的超高次谐波测量方法 (Ultrahigh harmonic measurement method based on fixed-frequency asynchronous sampling ) 是由 陶顺 要海江 王莹鑫 徐永海 郭傲 于 2020-05-12 设计创作，主要内容包括：一种基于定频非同步采样的超高次谐波测量方法,测量仪器采样频率为409.6kHz,对测得电压电流信号进行滤波、分频处理,滤掉频率低于1.5kHz以及高于64kHz的谐波分量；以200ms为一个基本测量窗,提取其中0-20ms、80-100ms、160-180ms数据,分别进行离散傅里叶分析并求均值作为输出频谱分析结果；以2kHz带宽对上述结果进行聚合,输出聚合频谱信号；对聚合频谱信号每3s无间隙进行时间窗聚合,求其均方根值,并输出时频域处理结果。本发明对于提高超高次谐波实时监测精度,掌握电力系统超高次谐波发射情况,研究超高次谐波的影响及防治具有重要意义。(A method for measuring ultra-high harmonic based on fixed-frequency asynchronous sampling is characterized in that the sampling frequency of a measuring instrument is 409.6kHz, filtering and frequency division processing are carried out on a measured voltage and current signal, and harmonic components with the frequency lower than 1.5kHz and higher than 64kHz are filtered; taking 200ms as a basic measurement window, extracting data of 0-20ms, 80-100ms and 160-180ms, respectively performing discrete Fourier analysis and averaging to obtain an output spectrum analysis result; aggregating the results with 2kHz bandwidth and outputting aggregated spectrum signals; and carrying out time window aggregation on the aggregation frequency spectrum signals in a gapless mode every 3s, solving the root mean square value of the aggregation frequency spectrum signals, and outputting a time-frequency domain processing result. The method has important significance for improving the real-time monitoring precision of the ultra-high harmonic, mastering the ultra-high harmonic emission condition of the power system and researching the influence and prevention of the ultra-high harmonic.)

一种基于定频非同步采样的超高次谐波测量方法

技术领域

本发明属电能质量分析技术领域，特别是涉及一种基于定频非同步采样的超高次谐波测量方法。

背景技术

随着配电网电力电子化和高比例可再生能源的接入，各种电力电子设备得到了广泛使用。与此同时，电力电子器件的开关频率也在不断提高，导致电网中超高次谐波含量显著增加，引发了电能质量新问题。

相比传统谐波，超高次谐波具有明显的宽频域特性，且频谱分布随时间动态变化，因此，超高次谐波的实时监测对测试设备的采样频率和数据处理能力提出了较高要求。现有满足要求的设备造价昂贵，不适合大范围应用，为实时分析带来了阻碍。