Advantages and disadvantages of FFT

a) FFT is the easiest way to calculate the Fourier transform.
b)The fundamental harmonic and its multiply of whole number harmonics (except inter harmonics) are extracted easily by FFT.
c)FFT algorithm is insufficient to extract the interharmonics and variable-frequency harmonics of a signal.
d)To prevent the aliasing, the anti-aliasing filters are used before the sampling of the signal. It is resulted with the delaying at the response time of FFT.
e) FFT can be calculated the harmonics after the one period of the signal left. Consequently, harmonics cannot be extracted simultaneous with reference signal.
e)To calculate the higher harmonics, the signal should be sampled at higher frequency.

Fundamentals and literature review of Fourier transform in power quality issues