Non-intrusive load disaggregation using graph signal processing

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Abstract

With the large-scale roll-out of smart metering worldwide, there is a growing need to account for the individual contribution of appliances to the load demand. In this paper, we design a Graph signal processing (GSP)-based approach for non-intrusive appliance load monitoring (NILM), i.e., disaggregation of total energy consumption down to individual appliances used. Leveraging piecewise smoothness of the power load signal, two GSP-based NILM approaches are proposed. The first approach, based on total graph variation minimization, searches for a smooth graph signal under known label constraints. The second approach uses the total graph variation minimizer as a starting point for further refinement via simulated annealing. The proposed GSP-based NILM approach aims to address the large training overhead and associated complexity of conventional graph-based methods through a novel event-based graph approach. Simulation results using two datasets of real house measurements demonstrate the competitive performance of the GSP-based approaches with respect to traditionally used Hidden Markov Model-based and Decision Tree-based approaches.
Original languageEnglish
Pages (from-to)1739-1747
Number of pages9
JournalIEEE Transactions on Smart Grid
Volume9
Issue number3
Early online date9 Aug 2016
DOIs
Publication statusPublished - 31 May 2018

Keywords

  • energy disaggregation
  • graph signal processing
  • energy feedback
  • smart metering
  • appliances
  • load demand
  • energy consumption

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