基于全相位FFT算法的电力谐波检测方法
new power harmonic detection method based on all-phase FFT Algorithm
谐波检测是电力系统谐波污染防治的关键。传统的基于加窗FFT谐波分析方法受非同步采样和信号截断的影响而出现较大的频谱泄露。全相位FFT综合考虑了数据中所有截断情况,因而具有优良的频谱泄露抑制性能和相位不变性。本文提出基于全相位时移相位差法的谐波检测方法,并对电力谐波进行了仿真实验。仿真结果表明:全相位时移相位差法能够精确提取出谐波信号中各次谐波的频率、幅值和相位信息,精度可达到小数点后第7位,远好于传统的加窗FFT方法。本方法为进一步提升电力谐波检测的精度奠定了理论基础。
Harmonic detection is the key technology of electric power system harmonic pollution detection and prevention. Affected by signal asynchronous sampling and truncated effect, the traditional harmonic analysis method based on windowed FFT algorithm occurs large spectral leakage. The all-phase FFT algorithm, comprehensively considering every truncated situation in data, has excellent performance on leakage suppressing and the characteristic of phase invariance. This paper proposes a new harmonic detection method based on the all-phase time-shifting phase difference correcting algorithm, and the simulation experiments with electric power harmonic are performed. The simulation results show that the proposed algorithm can extract accurately the signal frequencies, amplitudes and phases of every harmonic. The precision reaches 7 decimal places, whick is far better than the traditional windowed FFT algorithm. The proposed method lays a theoretical foundation for further improving the precision of power harmonic detection.
杨宇祥、樊巨宝
电气测量技术、电气测量仪器电工基础理论
电力谐波检测全相位FFT时移相位差法
Power Harmonics DetectionAll-Phase FFTTime-shifting phase difference method
杨宇祥,樊巨宝.基于全相位FFT算法的电力谐波检测方法[EB/OL].(2013-02-23)[2025-08-23].http://www.paper.edu.cn/releasepaper/content/201302-366.点此复制
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