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Methods and system for nonintrusive load monitoring

  • US 9,817,045 B2
  • Filed: 12/13/2011
  • Issued: 11/14/2017
  • Est. Priority Date: 12/13/2010
  • Status: Active Grant
First Claim
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1. A method for nonintrusive monitoring of electrical energy usage by a plurality of electrical loads at a premise to which electrical power is supplied via a common feed, comprising:

  • clustering, using at least one processor, tuples of power changes in the electrical energy usage at the premise that are attributable to a same load of the plurality of electrical loads at the premise, wherein the clustering comprises analyzing power changes in the electrical energy usage based on usage statistics for the plurality of electrical loads to identify power changes attributable to the same load;

    calculating, using the at least one processor, a degree of similarity between clusters of tuples of power changes based at least in part on times associated with power changes in the clusters;

    merging, using the at least one processor, clusters of tuples of power changes having a degree of similarity above a threshold;

    updating, using the at least one processor, the usage statistics to estimate times different loads of the plurality of electrical loads are in different states; and

    based on the updated usage statistics, processing, using the at least one processor, real-time power-change measurements to develop real-time load state information based on detected power changes in the electrical energy usage.

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