Analysis of the reconstruction of load curves in an urban Low Voltage substation

Abstract

The study of the load curves in an urban Low Voltage (LV) substation is a work that has been carried out over several years. A load curve is a sequence of values, associated with the energy consumption, in time. This sequence can be considered as a signal and, in order to study it the techniques and tools of signal processing can be applied. This article applies different signal processing tools to analyze the interpolation of the load curve of an urban LV substation. The above mentioned interpolation can be necessary for both the case of lost measurements reconstruction and for the estimation of non-existent measurements. The tests have been carried out on a records database of an actual LV substation. The power records have been made over more than 10 years. This substation has been selected because its consumptions were representative of the entire city, not only of the influence area. This choice has been made comparing LV substation measurements with the sum of the measurements of the high voltage lines that supply electricity to the city. The extracted conclusions are valid in trying to improve future predictive models of lost measurements reconstruction, data construction, etc.