Transient Normalization for Appliance Classification, Disaggregation, and Power Estimation in Non-Intrusive Load Monitoring

A method for monitoring individual appliance energy consumption using non-intrusive load monitoring (NILM), the method comprising:

• detecting an ON event and an OFF event within a segment of streaming power input and extracting the streaming power input associated with the ON event in response to detecting the ON event, the extracted streaming power input comprising a waveform associated with the ON event recorded over a time frame;
• normalizing the waveform to reveal one or more unique variations;
• classifying the normalized waveform based on the one or more unique variations;
• matching the ON event with a correlating OFF event based at least on the classification of the normalized waveform;
• and
• calculating power consumed from a time of the ON event to a time of the OFF event.

An apparatus for monitoring individual appliance energy consumption using non-intrusive load monitoring (NILM), the apparatus comprising:

• an event detection unit configured to detect an ON event and an OFF event within a segment of streaming input data, the event detection unit configured to extract a raw waveform associated with the OFF event in response to detecting the OFF event, the raw waveform comprising a first raw waveform of a first period of time before the OFF event and a second raw wave form of a second period of time after the OFF event;
• an alignment unit configured to align the raw waveform with a sinusoid wave using cross-correlation and subtract the second raw waveform from the first raw waveform to produce a third raw waveform of the OFF event;
• a classification unit configured to classify the third raw waveform by subtracting a period of a sine wave from a single period of the third raw waveform;
• a rules unit configured to match the OFF event with a correlating ON event based at least on the classification of the third raw waveform;
• and
• a power calculating unit configured to calculate the power consumed from the time of the ON event to the time of the OFF event.

A method for monitoring individual appliance energy consumption using non-intrusive load monitoring (NILM), the method comprising:

• detecting an ON event and an OFF event within a segment of streaming input data and extracting a raw waveform associated with the OFF event in response to detecting the OFF event, the raw waveform comprising a first raw waveform of a first period of time before the OFF event and a second raw wave form of a second period of time after the OFF event;
• aligning the raw waveform with a sinusoid wave using cross-correlation and subtracting the second raw waveform from the first raw waveform to produce a third raw waveform of the OFF event;
• classifying the third raw waveform by subtracting a period of a sine wave from a single period of the third raw waveform;
• matching the OFF event with a correlating ON event based at least on the classification of the third raw waveform;
• and
• calculating the power consumed from the time of the ON event to the time of the OFF event.