Hybridizing Lead–Acid Batteries with Supercapacitors: A Methodology

Xi Luo, Jorge Varela Barreras, Clementine L. Chambon, Billy Wu and Efstratios Batzelis
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Xi Luo: Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, UK
Jorge Varela Barreras: Department of Mechanical Engineering, Imperial College London, London SW7 2AZ, UK
Clementine L. Chambon: Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
Billy Wu: Dyson School of Design Engineering, Imperial College London, London SW7 2AZ, UK
Efstratios Batzelis: Department of Electrical and Electronic Engineering, Imperial College London, London SW7 2AZ, UK

Energies, 2021, vol. 14, issue 2, 1-27

Abstract: Hybridizing a lead–acid battery energy storage system (ESS) with supercapacitors is a promising solution to cope with the increased battery degradation in standalone microgrids that suffer from irregular electricity profiles. There are many studies in the literature on such hybrid energy storage systems (HESS), usually examining the various hybridization aspects separately. This paper provides a holistic look at the design of an HESS. A new control scheme is proposed that applies power filtering to smooth out the battery profile, while strictly adhering to the supercapacitors’ voltage limits. A new lead–acid battery model is introduced, which accounts for the combined effects of a microcycle’s depth of discharge (DoD) and battery temperature, usually considered separately in the literature. Furthermore, a sensitivity analysis on the thermal parameters and an economic analysis were performed using a 90-day electricity profile from an actual DC microgrid in India to infer the hybridization benefit. The results show that the hybridization is beneficial mainly at poor thermal conditions and highlight the need for a battery degradation model that considers both the DoD effect with microcycle resolution and temperate impact to accurately assess the gain from such a hybridization.

Keywords: hybrid energy storage system; supercapacitor; lead–acid battery; energy management system; battery degradation; depth of discharge; techno-economic analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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