Turkish Journal of Electrical Engineering and Computer Sciences




The role of nonintrusive load monitoring (NILM) is to identify the operating schedules of individual appliances and their power consumption from single-point electrical measurements. This paper discusses appliance load monitoring based on the harmonic analysis of the steady-state current, which is specifically suited for identification of nonlinear appliances. The existing harmonic-based NILM methods have limited applicability due to the fact that their complexity increases exponentially with the number of target appliances. In order to overcome this problem, this study suggests the use of the step changes of current harmonic phasors as a feature for appliance detection. The key benefit of the proposed method is that only individual appliance signatures are needed to identify load activities, as opposed to the previous NILM methods that require load signatures with respect to all possible appliance combinations.

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