Harmonic Detection Method in Power Network Based on FFT Algorithm
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摘要: 针对传统电网谐波检测方法误差较大、运算速度慢的问题,提出了基于FFT算法的电网谐波检测方法;介绍了DSP芯片的定点运算、基于FFT算法的电网谐波检测方法的具体实现,并进行了仿真分析。该方法在高速定点DSP芯片TMS320F2812上实现FFT算法,将数据归一化为Q15格式进行计算;为减小频谱泄漏对检测结果造成的影响,采用加窗插值FFT算法进行谐波分析。该方法实现了对电网电压各次谐波的检测,保证了检测速度和精度。Abstract: In allusion to problems of big error and slow operation speed of traditional harmonic detection methods in power network, the paper proposed a detection method based on FFT algorithm, introduced fixed-point operation of DSP chip and specific implementation of harmonic detection method based on FFT algorithm, and did simulation analysis. The method realizes FFT algorithm using high-speed fixed-point DSP chip TMS320F2812, normalized the data to Q15 format to calculate, and used windowed interpolation FFT algorithm for harmonic analysis to reduce impact of spectral leakage on detecting result. The method realizes harmonics detecting of power network and ensures detection speed and accuracy.
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