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http://dx.doi.org/10.5370/KIEEP.2011.60.2.076

Frequency Estimation Technique using Recursive Discrete Wavelet Transform  

Park, Chul-Won (강릉원주대학교 전기공학과)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.60, no.2, 2011 , pp. 76-81 More about this Journal
Abstract
Power system frequency is the main index of power quality indicating an abnormal state and disturbances of systems. The nominal frequency is deviated by sudden change in generation and load or faults. Power system is used as frequency relay to detection for off-nominal frequency operation and connecting a generator to an electrical system, and V/F relay to detection for an over-excitation condition. Under these circumstances, power system should maintain the nominal frequency. And frequency and frequency deviation should accurately measure and quickly estimate by frequency measurement device. The well-known classical method, frequency estimation technique based on the DFT, could be produce the gain error in accuracy. To meet the requirements for high accuracy, recently Wavelet transforms and analysis are receiving new attention. The Wavelet analysis is possible to calculate the time-frequency analysis which is easy to obtain frequency information of signals. However, it is difficult to apply in real-time implementation because of heavy computation burdens. Nowadays, the computational methods using the Wavelet function and transformation techniques have been searched on these fields. In this paper, we apply the Recursive Discrete Wavelet Transform (RDWT) for the frequency estimation. In order to evaluate performance of the proposed technique, the user-defined arbitrary waveforms are used.
Keywords
DFT; Frequency Estimation; Nominal Frequency; Recursive Discrete Wavelet Transform; Wavelet Function;
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Times Cited By KSCI : 1  (Citation Analysis)
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