Abstract:

 A two-cycle melioration algorithm based on discrete Fourier transform (DFT) was presented. This method can be used  to calculate the dielectric dissipation factor of electric power system. The   frequency spectrum leaking and the error of  truncation caused by frequency deviation can be reduced by means of amending two periods of the grid signal into one period. Error analysis shows that the accuracy of this algorithm is the same as that of traditional solutions (adding window method), but the operation time of this method is 3 times less than those of the traditional solutions.

Key words: discrete Fourier transform (DFT), dielectric dissipation factor; , two-cycle melioration algorithm