JOURNAL OF LIGHT INDUSTRY

CN 41-1437/TS  ISSN 2096-1553

Volume 33 Issue 2
March 2018
Article Contents
WU Zhenjun, MA Luyao and QIU Hongbo. Frequency fast estimating method of power system based on zero-crossing method of DFT output[J]. Journal of Light Industry, 2018, 33(2): 63-69. doi: 10.3969/j.issn.2096-1553.2018.02.010
Citation: WU Zhenjun, MA Luyao and QIU Hongbo. Frequency fast estimating method of power system based on zero-crossing method of DFT output[J]. Journal of Light Industry, 2018, 33(2): 63-69. doi: 10.3969/j.issn.2096-1553.2018.02.010 shu

Frequency fast estimating method of power system based on zero-crossing method of DFT output

  • Received Date: 2017-12-04
    Available Online: 2018-03-15
  • Aiming at the low accuracy of discrete fourier transform (DFT) frequency estimation,a new fast detection method was proposed based on DFT output zero-crossing.The DFT output characteristics of the signal were analyzed firstly.The zero-crossing time of the DFT real part (or imaginary) was calculated accurately by using the fourth order Newton interpolation method.The system frequency could be obtained by the time difference between two zero-crossing points.The results of simulation analysis and experimental verification showed that the method had higher frequency estimation accuracy and less harmonic disturbance, and only needed 1.78 cycles to achieve frequency estimation, which was suitable for power system with real time requirement.
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