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Trimming_Feature_Extraction_and_Inference_for_MCU_based_Edge_NILM__a_Systematic_Approach___TII_Journal___FINAL_SUBMISSION___ariXiv (10).pdf (1.42 MB)

TRIMMING FEATURE EXTRACTION AND INFERENCE FOR MCU-BASED EDGE NILM: A SYSTEMATIC APPROACH

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posted on 28.05.2021, 16:14 by Enrico TabanelliEnrico Tabanelli, Davide BrunelliDavide Brunelli, Luca Benini, Andrea Acquaviva
Non-Intrusive Load Monitoring (NILM) enables the disaggregation of the global power consumption of multiple loads, taken from a single smart electrical meter, into appliance-level details. State-of-the-Art approaches are based on Machine Learning methods and exploit the fusion of time- and frequency-domain features from current and voltage sensors. Unfortunately, these methods are compute-demanding and memory-intensive. Therefore, running low-latency NILM on low-cost, resource-constrained MCU-based meters is currently an open challenge. This paper addresses the optimization of the feature spaces as well as the computational and storage cost reduction needed for executing State-of-the-Art (SoA) NILM algorithms on memory- and compute-limited MCUs. We compare four supervised learning techniques on different classification scenarios and characterize the overall NILM pipeline’s implementation on a MCU-based Smart Measurement Node. Experimental results demonstrate that optimizing the feature space enables edge MCU-based NILM with 95.15% accuracy, resulting in a small drop compared to the most-accurate feature vector deployment (96.19%) while achieving up to 5.45x speed-up and 80.56% storage reduction. Furthermore, we show that low-latency NILM relying only on current measurements reaches almost 80% accuracy, allowing a major cost reduction by removing voltage sensors from the hardware design.

Funding

Arrowhead Tools for Engineering of Digitalisation Solutions (826452, Arrowhead Tools)

Ministry of Education and Science

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Dipartimenti di Eccellenza (2018-2022)

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Email Address of Submitting Author

enrico.tabanelli3@unibo.it

ORCID of Submitting Author

0000-0002-3155-8774

Submitting Author's Institution

University of Bologna

Submitting Author's Country

Italy