Power Harmonic Measurement System Based on Improved Interpolated DFT Algorithm
A new harmonics analysis method based on the improved interpolation DFT algorithm was proposed,and a power harmonic analysis framework incorporating this algorithm was constructed,which can realize the acquisition,anal-ysis and application of harmonic signals.The improved interpolation DFT algorithm could analyze the influence of the leak-age interference of negative frequency components on the basis of the conventional three-point interpolation DFT,and then facilitated the establishment of a spectrum expression containing negative frequency components by using the spectral characteristics of the maximum sidelobe attenuation window function.An improved three-point interpolation DFT algo-rithm that took into account negative frequency interference was derived to realize high-precision frequency correction esti-mation under short-time sampling.The effectiveness of the algorithm was verified through multiple comparative simulation analyses and experimental tests.The results showed that the new algorithm can not only maintain relatively stable and extremely accurate correction estimation accuracy under any fluctuation period,and also had strong anti-noise robustness.
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