A New Power Signature for Nonintrusive Appliance Load Monitoring

Nonintrusive appliance load monitoring (NIALM) method requires only one set of voltage and current sensors to be installed at the electrical service entry for load disaggregation and has attracted considerable research interests. NIALM´s identity accuracy is closely related to power signatures (PSs) of loads. The current waveform (CW) is a PS which is frequently used. In order to improve CW´s discrimination, this letter uses power theory to decompose CW to active and nonactive current. The experimental results indicate that the similarity between different appliances of the proposed PS is lower, compared with the CW and other PSs, leading to better load disaggregation.