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Energies 2017, 10(4), 538;

Load Signature Formulation for Non-Intrusive Load Monitoring Based on Current Measurements

Electrical Power Laboratory, Department of Electrical Engineering, Western Macedonia University of Applied Sciences, 50100 Kozani, Greece
Power Systems Laboratory, Department of Electrical and Computer Engineering, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
mSensis S.A., VEPE Technopolis, Bld. C2, P.O. Box 60756, 57001 Thessaloniki, Greece
Author to whom correspondence should be addressed.
Academic Editor: Rodolfo Araneo
Received: 14 February 2017 / Revised: 28 March 2017 / Accepted: 10 April 2017 / Published: 16 April 2017
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In this paper we present a new methodology for the formulation of efficient load signatures towards the implementation of a near-real time Non-Intrusive Load Monitoring (NILM) approach. The purpose of this work relies on defining representative current values regarding the 1st, 3rd and 5th harmonic orders to be utilized in the load signatures formulation. A measurement setup has been developed and steady-state measurements have been performed in a Low Voltage residence. A data processing methodology is proposed aiming to depict representative current values for each harmonic order in order to keep the load signature short and simple. In addition, a simple disaggregation scheme is proposed under linear equations for the disaggregation mode in order to examine the near-real time application of the methodology. The analysis indicates that the developed load signatures could be efficient for a per second application rate of the NILM algorithm. The results show that the higher harmonic currents facilitate the identification performance. Finally, the analysis concludes that for combinations that include appliances with intense harmonic content, the phase angle of the higher for harmonic currents should also be considered to the load signatures formulation. View Full-Text
Keywords: NILM; load signatures; load identification; odd harmonic currents NILM; load signatures; load identification; odd harmonic currents

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Bouhouras, A.S.; Gkaidatzis, P.A.; Chatzisavvas, K.C.; Panagiotou, E.; Poulakis, N.; Christoforidis, G.C. Load Signature Formulation for Non-Intrusive Load Monitoring Based on Current Measurements. Energies 2017, 10, 538.

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