IEC框架下非同步采样时的谐波和间谐波测量方法

发布时间：2018-03-03 10:00

本文选题：非同步采样　切入点：IEC框架　出处：《电力系统自动化》2015年03期 　论文类型：期刊论文

【摘要】：基频非同步采样时,离散傅里叶变换/快速傅里叶变换(DFT/FFT)频谱会发生泄漏现象,谐波、间谐波频谱相互干扰而影响测量结果,传统的加窗插值方法忽略了其他分量对关注分量的长程泄漏影响。文中首先在IEC框架下对加Hanning窗的信号进行频谱变换,使其他分量的侧瓣上相邻谱线相位差为180°,利用相邻谱线的矢量和消除长程泄漏对关注分量的影响,从而提出了谐波、间谐波分组测量和精确测量方法,实现了谐波、间谐波具体参数的测量。在此基础上提出了邻近谐波、间谐波分离方法,并进一步通过逐次剔除已知分量在关注谱线上的频谱泄漏值来提高测量精度,当非同步采样且不增加采样数据长度时,有效解决了谐波、间谐波相隔很近时无法准确分离测量的难题。仿真和工程数据均验证了所提方法在IEC框架要求下测量的实时性和有效性。
[Abstract]:When the fundamental frequency sampling is not synchronous, the discrete Fourier transform (DFT) / Fast Fourier transform (FFT) DFT / FFTT spectrum will leak, the harmonics and the inter-harmonic spectrum will interfere with each other and affect the measurement results. The traditional windowed interpolation method ignores the long range leakage effect of other components on the components of concern. In this paper, the frequency spectrum of the signal with Hanning window is firstly transformed under the framework of IEC. The phase difference of the adjacent spectral line on the side lobe of other components is 180 掳. By using the vector of the adjacent spectral line and eliminating the effect of long range leakage on the concerned component, the methods of harmonic and inter-harmonic grouping measurement and accurate measurement are put forward, and the harmonics are realized. Based on the measurement of specific parameters of interharmonics, a method of separating adjacent harmonics and interharmonics is proposed, and the measurement accuracy is improved by eliminating the spectral leakage values of known components on the concerned spectral lines step by step. When the sampling is asynchronous and the length of the sampled data is not increased, the harmonics can be solved effectively. It is difficult to separate the measurement accurately when the interharmonics are very close. The simulation and engineering data show that the proposed method is real-time and effective under the requirement of IEC framework.
【作者单位】：四川大学电气信息学院;国网江苏省电力公司电力科学研究院;
【分类号】：TM935

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