基于频率搜索的间谐波闪变检测方法

发布时间：2019-04-16 17:54

【摘要】：电压波动与闪变是电能质量的一项重要指标。随着间谐波大量注入电网,间谐波引起的闪变越来越受到人们重视。基于间谐波的闪变效应计算方法的关键在于间谐波的精确检测,然而谐波与间谐波间、间谐波与间谐波间存在的干扰影响了间谐波的检测精度。针对该问题,文中在时域准同步和加窗插值的基础上提出一种频率搜索的方法,该方法通过分析加窗后间谐波的频谱特性,得到多个间谐波共同作用时的理论频谱与实际频谱的匹配程度,通过搜索得到匹配程度最大时对应的频率,进而得到间谐波参数。经仿真验证,该方法有效降低了谐波泄露和加窗后主瓣宽度对间谐波检测结果的影响,准确检测出多个间谐波分量的频率和幅值,从而计算出间谐波的闪变效应。
[Abstract]:Voltage fluctuation and flicker are an important index of electric energy quality. With the large number of interharmonics injected into the power grid, the flicker caused by the interharmonics is becoming more and more important. The key of the method for calculating the flicker effect based on the inter-harmonic is the accurate detection of the interharmonics, but the interference between the harmonic and the interharmonic, the inter-harmonic and the inter-harmonic influences the detection accuracy of the interharmonics. In order to solve the problem, a method for frequency searching is proposed based on time-domain quasi-synchronization and windowing interpolation, and the matching degree between the theoretical frequency spectrum and the actual frequency spectrum is obtained by analyzing the spectral characteristics of the inter-window harmonics, The frequency corresponding to the maximum matching degree is obtained by searching, and then the inter-harmonic parameters are obtained. Through the simulation and verification, the method effectively reduces the influence of the harmonic leakage and the width of the main lobe after the window on the detection result of the inter-harmonic, and accurately detects the frequency and the amplitude of the plurality of inter-harmonic components, so as to calculate the flicker effect of the inter-harmonic.
【作者单位】：上海交通大学电子信息与电气工程学院;
【分类号】：TM711

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