Short-duration Electrical Power Fluctuations Suppression by Averaging in Low Voltage Distribution Grid

In this paper the effectiveness of averaging technique for the suppression of short-duration fluctuations typical to power consumption profiles in electrical distribution grid is investigated. It is assumed that the household or office loads toggling activities are located in the lower frequency range compared to power fluctuations spectrum observable by an energy meter. Random power fluctuations caused variance of the estimate of nominal load of interest could be reduced by averaging of a group of acquired power samples. To explore the rate of variance reduction in response to the volume of averaged samples or duration of averaging, both real experimental power records from typical office building and household simulated power profiles were utilized. It was determined that in the presence of typical distribution grid power fluctuations the 0.1 W standard deviation of power samples averaged over 1 second intervals can be achieved within 6 minutes. Using the available synthesized household daily power profiles, 0.2W standard deviation of fluctuations was achievable after approximately 3 hours of averaging.