Time-frequency and time-scale domain analysis of voltage disturbances

被引：258

作者：

Gu, YH ^{[1
]}

Bollen, MHJ

机构：

[1] Chalmers Univ Technol, Dept Signals & Syst, S-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Elect Power Engn, S-41296 Gothenburg, Sweden

来源：

IEEE TRANSACTIONS ON POWER DELIVERY | 2000年 / 15卷 / 04期

关键词：

discrete short-time Fourier transforms; harmonic analysis; power quality; time-frequency analysis; voltage sags; wavelet transforms;

D O I：

10.1109/61.891515

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页码：1279 / 1284

页数：6

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