Sampling frequency and time window influence on flicker measurements significance. A case study

Most of the Power Quality surveys in industrialized countries are performed according to the parameters defined in the EN50160 standard, which sets oneweek measurement periods with ten-minute sampling time for most power quality disturbances such as flicker and harmonics. Both the sampling periods and the measurement period have a great influence on the significance of the values obtained as well as on the conclusions taken. In this paper, an attempt is made to compare the values obtained with different sample frequencies and time windows, working on instantaneous flicker (Ifl) values for a wind turbine over three weeks.