All Phase FFT Analysis with Phase Measurement Applications in Electronic Measurement

Abstract

At present, phase measurement method of power frequency three-phase power signal containing multiple harmonic, is generally based on the Hanning window FFT correction measurement methods. But their accuracy limited by the conventional FFT features is very difficult to guarantee. When the measured instantaneous phase is very small, the phase difference accuracy measured will be reduced; when the measured signal contains a large number of harmonic components, a larger measurement error will be made; when the cycle of the detected signal is instable, non-synchronous sampling will be produced so that the measurement accuracy will be affected. To solve the problems above, this paper analyzes the characteristic advantages of all phase FFT algorithm in the application of three-phase power phase measurement. The algorithm is an important electronic technology algorithm, which makes the measurement of small phase difference still maintaining high accuracy and makes the measurement results not affected by the harmonic component and non-synchronous sampling.