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Assessing the Limits of Equivalent Circuit Models and Kalman Filters for Estimating the State of Charge: Case of Agricultural Robots

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  • German Monsalve

    (Electrical and Computer Engineering Department, University of Quebec at Trois-Rivieres, 3351, Boulevard des Forges, Trois-Rivieres, QC G8Z 4M3, Canada)

  • Alben Cardenas

    (Electrical and Computer Engineering Department, University of Quebec at Trois-Rivieres, 3351, Boulevard des Forges, Trois-Rivieres, QC G8Z 4M3, Canada)

  • Diego Acevedo-Bueno

    (Electrical and Computer Engineering Department, University of Quebec at Trois-Rivieres, 3351, Boulevard des Forges, Trois-Rivieres, QC G8Z 4M3, Canada)

  • Wilmar Martinez

    (Department of Electrical Engineering (ESAT), KU Leuven—EnergyVille, Thor Park 8310-bus 12135, 3600 Genk, Belgium)

Abstract

The battery State of Charge (SoC) is critical information to overcome agricultural robots’ limitations related to battery and energy management. Although several SoC estimation methods have been proposed in the literature, the performance of these methods has not been validated for different battery chemistries in agricultural mobile robot applications. Compared to previous work, this paper evaluates the limits of the SoC estimation using the RC model and the Thevenin model for a Lithium Iron Phosphate (LFP) battery and a Sealed Lead Acid (SLA) battery. This evaluation used a custom agricultural robot in a controlled indoor environment. Consequently, this work assessed the limitations of two ECM-based SoC estimation methods using battery packs, low-cost sensors and discharge cycles typically used in agricultural robot applications. Finally, the results indicate that the RC model is not suitable for SoC estimation for LFP battery; however, it achieved a mean absolute error (MAE) of 2.2% for the SLA battery. On the other hand, the Thevenin model performed properly for both chemistries, achieving MAE lower than 1%.

Suggested Citation

  • German Monsalve & Alben Cardenas & Diego Acevedo-Bueno & Wilmar Martinez, 2023. "Assessing the Limits of Equivalent Circuit Models and Kalman Filters for Estimating the State of Charge: Case of Agricultural Robots," Energies, MDPI, vol. 16(7), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3133-:d:1111719
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    References listed on IDEAS

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    1. Xiaosong Hu & Fengchun Sun & Yuan Zou, 2010. "Estimation of State of Charge of a Lithium-Ion Battery Pack for Electric Vehicles Using an Adaptive Luenberger Observer," Energies, MDPI, vol. 3(9), pages 1-18, September.
    2. Ng, Kong Soon & Moo, Chin-Sien & Chen, Yi-Ping & Hsieh, Yao-Ching, 2009. "Enhanced coulomb counting method for estimating state-of-charge and state-of-health of lithium-ion batteries," Applied Energy, Elsevier, vol. 86(9), pages 1506-1511, September.
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