Non-Intrusive Electrical Appliances Monitoring and Classification using K-Nearest Neighbors

TL;DR

This paper explores non-intrusive load monitoring by disaggregating total energy consumption into individual appliances and classifying them using the K-Nearest Neighbors algorithm, demonstrating its effectiveness with real-world data.

Contribution

It introduces a method combining NILM with KNN classification to identify appliances from aggregated energy data, using the REDD dataset for validation.

Findings

KNN effectively classifies appliance signatures

Preprocessing improves classification accuracy

Disaggregation enables appliance-specific energy feedback

Abstract

Non-Intrusive Load Monitoring (NILM) is the method of detecting an individual device's energy signal from an aggregated energy consumption signature [1]. As existing energy meters provide very little to no information regarding the energy consumption of individual appliances apart from the aggregated power rating, the spotting of individual appliances' energy usages by NILM will not only provide consumers the feedback of appliance-specific energy usage but also lead to the changes of their consumption behavior which facilitate energy conservation. B Neenan et al. [2] have demonstrated that direct individual appliance-specific energy usage signals lead to consumers' behavioral changes which improves energy efficiency by as much as 15%. Upon disaggregation of an energy signal, the signal needs to be classified according to the appropriate appliance. Hence, the goal of this paper is to disaggregate total energy consumption data to individual appliance signature and then classify appliance-specific energy loads using a prominent supervised classification method known as K-Nearest Neighbors (KNN). To perform this operation we have used a publicly accessible dataset of power signals from several houses known as the REDD dataset. Before applying KNN, data is preprocessed for each device. Then KNN is applied to check whether their energy consumption signature is separable or not. KNN is applied with K=5.