Abstract：Due to spectrum leakage, traditional phase difference methods with little attenuation of side lobe led to a larger error in the measurement of power harmonic. And the selection of window is restricted because the dependence on analytic expression. This paper uses an improved phase difference method that based on Hanning window. It performs polynomial transformation on the result of fast Fourier transform(FFT) to get a new sequence, then adjusts harmonic parameters with the new sequence. To verify its performance, do simulation calculation and compare it with other common methods, simulate for 10 000 times at random frequency to calculate its standard error, shorten the sampling window to explore its real-time performance. The results show that, the new method is more accurate than other methods, when the frequency ranges between 47 Hz and 53 Hz, the accuracy of harmonic parameters reaches to 10-5. And under the 100 milliseconds sampling length, it also can satisfy the IEC 61000—4—7 standard. Taking computational accuracy into account, the correction formula is derived from Hanning window and it′s quite simple. It′s a useful harmonic parameters detection algorithm.
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2017, Vol. 32 
