4.7 Article

An Efficient Lightweight Event Detection Algorithm for On-Site Non-Intrusive Load Monitoring

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2022.3232169

Keywords

Energy disaggregation; event detection; event-based non-intrusive load monitoring (NILM); lightweight algo-rithms; NILM; on-site implementation

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Non-intrusive load monitoring (NILM) is used to determine individual-appliance energy consumption by decomposing aggregated electricity measurements. To address the challenges of high-frequency sampling rates and computational resources, a lightweight event-detection algorithm is proposed for on-site implementation. The algorithm utilizes simple features, multiple criteria, and slope-coefficient inspection to detect events accurately and efficiently.
Non-intrusive load monitoring (NILM) aims to determine individual-appliance energy consumption with minimum cost by decomposing aggregated electricity measurements. Although important for achieving energy conservation and cost minimization, NILM requires high-frequency sampling rates to provide accurate results. This requirement significantly increases the need for storage and computational resources in the electric utility's fog/cloud infrastructure and for bandwidth on the customer's side. To resolve these issues, on- site disaggregation, i.e., on the monitoring device, can be employed. However, to keep device-cost low, lightweight NILM algorithms are needed. To this end, a lightweight event-detection algorithm designed to ease on- site implementation, on either software or hardware, is proposed. Event detection is the first, critical half of the well-established event-based NILM approach; it identifies appliance state changes (events). Although a few lightweight event-detection techniques, utilizing high-frequency data, have been presented in the literature, their performance is relatively low in complex-load cases. The proposed algorithm utilizes simple-to-compute features and employs multiple simple criteria to declare an event as detected and slope-coefficient inspection to identify steady states. Moreover, it can detect events with very small time difference between them. Comparisons show that its performance is superior even against more complex event-detection approaches, while its low computational cost is also verified.

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