A Variable N Synchronous Sampling Method for Grid Aperiodic Harmonic Detection and Analysis

This paper proposed a new AC signal detection method based on variable N synchronous sampling to solve the problems on the harmonic detection and analysis of periodic sin waveform in power grid. Comparing with the traditional fixed N synchronous sampling detection in which the number of sampled data is constant in a period, the key difference of the new method is that the period of sampling points as an unknown variable N, to suit for signal detection in the actual situation. Through the acquisition processing and analysis of data detected, the entire period of synchronous sampling could be obtained to overcome the effects of spectral leakage and fence effect.