An improved optimize method for power harmonics analysis based on windowed double-spectrum-line interpolation

Abstract

Double-spectrum-line interpolation could effectually decrease the frequency spectral leakage caused by non-synchronized sampling and non-integral period truncation in harmonics analysis; however, this algorithm is not complicated and facilitates the realization in embedded system. Some parameters of interpolation polynomials in windowed Double-spectrum-line interpolation are given along with a developed formula of phase. An optimized method is also proposed which enhances real-time performance by decreasing periods of sample. A program flow chart is provided in this paper. The precision range is obviously inhibited under frequency variation. The simulation of a complex signal with 21 order harmonics verifies the effectiveness of the method.