Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 15, Issue 4, Pages 1279-1284Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/61.891515
Keywords
discrete short-time Fourier transforms; harmonic analysis; power quality; time-frequency analysis; voltage sags; wavelet transforms
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This paper discusses the analysis of voltage disturbance recordings in the time-frequency domain and in the time-scale domain. The discrete Short-Time Fourier Transform (STFT) is used for the time-frequency domain; dyadic and binary-tree wavelet filters for the time-scale domain. The theory is explained with special emphases on the analysis of voltage disturbance data. Dyadic wavelet filters are not suitable for the harmonic analysis of disturbance data. Filter center frequencies and bandwidths are inflexible, and the results do not give easy insight in the time behavior of the harmonics. On the other hand band-pass filter outputs from discrete STFT are well associated with harmonics and are thus more useful for power system analysis. With a properly chosen window size, discrete STFT is also able to detect and analyze transients in a voltage disturbance. Overall, STFT is more suitable than wavelet filters for the analysis of voltage disturbance data.
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