Howtosignalprocessing
How do you remove harmonics from FFT?
The harmonic filter is the best solution for eliminating the harmonics caused by the non-linear loads. Keywords: Total Harmonic Distortion (THD), Adjustable Frequency Controller (AFC), Matrix Laboratory (MATLAB), Fast Fourier Transform (FFT). Power quality determines the fitness of electrical power to consumer devices.
What causes harmonics in FFT?
Harmonics "happen" when your input to an FFT isn't a pure unmodulated sine wave. Any unexpected distortion in your input waveform generation (from being exactly identical to mix of sin(wt) + cos(wt)) can be the cause of harmonics appearing in an FFT result (above the noise floor and any windowing artifacts).
How do harmonics appear?
Harmonics are the result of nonlinear loads that convert AC line voltage to DC. Harmonics flow into the electrical system because of nonlinear electronic switching devices, such as variable frequency drives (VFDs), computer power supplies and energy-efficient lighting.
