Resolving Power Consumption of Variable Power Electronic Loads Using Nonintrusive Monitoring

This paper demonstrates a new estimator to resolve the average power consumption of a variable-speed drive (VSD) from other constant power loads using a spectral estimation method and a switching function technique for nonintrusive load monitoring (NILM) applications. The estimator uses the rectifier switching function to create adaptive estimating functions for the fundamental power from a finite set of current harmonics generated by the VSD. Experimental results show that the proposed VSD power estimator can significantly improve NILM´s ability to resolve the VSD power consumption under small input voltage variation.