基于FFT和WT结合的电网谐波检测技术研究
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摘要
电网谐波测量在电力系统中具有重要的作用,对电网谐波含量进行实时测量,准确掌握电网中谐波信息是十分必要的。本文根据电网谐波的特点,提出了基于快速傅里叶变换(Fast Fourier Transform,FFT)和小波变换(Wavelet Transform,WT)结合的电网谐波检测方法。利用FFT检测信号中的稳态谐波成分,并对信号中的非稳态成分进行小波变换,确定瞬间突变情况。仿真结果显示,本算法能够有效的提高检测的实时性和准确性。
引文
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