Non-intrusive energy disaggregation by detecting similarities in consumption patterns

Juan P. Chavat; Jorge Graneri; Sergio Nesmachnow

doi:10.17533/udea.redin.20200370

Authors

Juan P. Chavat University of the Republic https://orcid.org/0000-0001-9925-2651
Jorge Graneri University of the Republic
Sergio Nesmachnow University of the Republic

DOI:

https://doi.org/10.17533/udea.redin.20200370

Keywords:

non-intrusive load monitoring, pattern similarities, energy efficiency

Abstract

Breaking down the aggregated energy consumption into a detailed consumption per appliance is a crucial tool for energy efficiency in residential buildings. Non-intrusive load monitoring allows implementing this strategy using just a smart energy meter without installing extra hardware. The obtained information is critical to provide an accurate characterization of energy consumption in order to avoid an overload of the electric system, and also to elaborate special tariffs to reduce the electricity cost for users. This article presents an approach for energy consumption disaggregation in households, based on detecting similar consumption patterns from previously recorded labelled datasets. The experimental evaluation of the proposed method is performed over four different problem instances that model real household scenarios using data from an energy consumption repository. Experimental results are compared with two built-in algorithms provided by the nilmtk framework (combinatorial optimization and factorial hidden Markov model). The proposed algorithm was able to achieve accurate results regarding standard prediction metrics. The accuracy was not affected in a significant manner by the presence of ambiguity between the energy consumption of different appliances or by the difference of consumption between training and test appliances.

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Author Biographies

Juan P. Chavat, University of the Republic

Faculty of Engineering.

Jorge Graneri, University of the Republic

Faculty of Engineering.

Sergio Nesmachnow, University of the Republic

Faculty of Engineering, Associate Professor.

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