Analysis of the Minimum Electrical Load of Residential Apartment Buildings in Urban Power Supply Systems

Abstract

At present, a significant part of the studies of a residential apartment building electrical load concerns only the analysis of the maximum load at the residential building power supply input and on the buses of the transformer substation supplying power to residential buildings. However, for a complete analysis of the residential apartment building power consumption, it is necessary to evaluate not only the maximum input power, but also the minimum load. The article presents the results from an analysis of electricity consumption in residential apartment buildings with electric stoves (taking the city of Moscow as an example). The power consumption in eight residential apartment buildings recorded by electric meters in the input switchgears of these buildings at 30-min intervals for several years was used as input data for the analysis. The dynamics of minimum electrical load variation during a year is considered; the dependence of the minimum power on the outdoor temperature is estimated, and the time of the day, day of the week, and month in which the residential building minimum electrical load is observed are determined. The distribution law of a random variable represented by the time in which the absolute annual minimum of the residential building electrical load is observed and its characteristics: mathematical expectation and standard deviation are determined. The results of a comparative analysis of the absolute annual minimum and maximum (design) load at the input of residential apartment buildings are presented.