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Study on High-precision Frequency Measurement Method Based on the4-term Nuttall Windowed Recursive DFT Interpolation Algorithm
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[1]XU Min,LIU Xiao-hui,WANG Xi,et al.Study on High-precision Frequency Measurement Method Based on the4-term Nuttall Windowed Recursive DFT Interpolation Algorithm[J].Journal of Zhengzhou University (Engineering Science),2013,34(01):66-69.[doi:10.3969/j.issn.1671-6833.2013.01.016]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 34卷 Number of periods: 2013 01 Page number: 66-69 Column: Public date: 2013-01-16
Title:
Study on High-precision Frequency Measurement Method Based on the4-term Nuttall Windowed Recursive DFT Interpolation Algorithm
Author(s):
XU Min1; LIU Xiao-hui1; WANG Xi2; XU Hui3; WANG Yi3; CAO Yuan-qian4
1.College of Electrical Engineering，Zhengzhou University，Zhengzhou 450002，China;2.Shangqiu Electric Power Bureau ,Shangqiu 476000 ,China; 3.CPIl Kaifeng Power Branch Company，Kaifeng 475000，China; 4.College of lnformation Science andTechnology ，Donghua University ，Shanghai 201620，China
Keywords:
Key words; recursive DFT algorithm; Nuttall window;  spectrum leakage ;  frequency ;  interpolation FFT algo-rithm
CLC:
TM711
DOI:
10.3969/j.issn.1671-6833.2013.01.016
Abstract:
In order to improve the accuracy of calculation of the power system frequency,a high-precision fre-quency measurement method based on the 4-term Nuttall windowed recursive DFT interpolation algorithm hasbeen put forward. Energy of four cosine window is more concentrated in the main lobe,very small in the sidelobe,so the 4-term Nuttall windowed recursive FFT interpolation algorithm can greatly reduce the effects ofspectral leakage,and spectral interference is very small, which can reduce the frequency measurement inter-ference caused by spectrum leakage and harmonic,and the frequency offset formula of the method is simple.In order to reduce the amount of plus four cosine windowed FFT calculation,this paper. introduces the plusfour cosine window recursive DFT method which improves the traditional method,these improvements effec-tively reduce the 4-term Nuttall windowed recursive DFT interpolation algorithm and improves the calculationaccuracy of the frequency.Simulation results verify the calculation accuracy of the proposed algorithm.
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