FUNDAMENTAL FREQUENCY STABILITY AND HARMONIC ANALYSIS

摘要

The method comprises taking a number of samples of an electrical signal throughout a main sampling window (S1); dividing the number of samples taken throughout the main sampling window into a plurality of groups of consecutive samples, each group of consecutive samples forming a subwindow (S2), wherein each subwindow includes a minimum number of the number of samples required to provide a required level of accuracy for estimating the fundamental frequency of the electrical signal; estimating, for each subwindow, the fundamental frequency of the electrical signal based on the group of consecutive samples of the respective subwindow (S3); and determining if the fundamental frequency is stable throughout the main window by comparing the estimated fundamental frequency of each subwindow (S4).