期刊
ENERGY REPORTS
卷 8, 期 -, 页码 1-7出版社
ELSEVIER
DOI: 10.1016/j.egyr.2022.05.040
关键词
Battery energy storage; Hybrid energy storage; Dual chemistry; Lead-acid; Li-ion
资金
- Engineering and Physical Sciences Research Council (EPSRC), United Kingdom through the Center for Doctoral Training in Energy Storage and its Applications
- GS Yuasa Battery Europe Ltd
This paper presents a performance overview of a 100 kW/270 kWh grid-connected hybrid battery energy storage system and analyzes its operational data. The analysis shows that the average round-trip energy efficiency of the system is 90% and depends on the depth of discharge. Additionally, the energy transfer between the strings during charge or discharge process averages 5.5% (during charge) and 2.47% (during discharge) of the total discharged energy.
The use of energy storage systems is inevitable in a power grid dominated by renewable generators. This paper presents a performance overview of a 100 kW/270 kWh, grid-connected, hybrid battery energy storage system. The hybrid system uses two types of battery chemistries, li-ion and lead-acid connected directly at the DC bus - without power electronic converters. After a brief introduction and a short technical description of the project, the paper presents a three year, 2019 to 2021, operational data set. The battery data is later split into individual charge/discharge cycles and analyzed in terms of power and strings current sharing, energy, round-trip efficiency and energy transfer between the strings. The analysis shows that the average round-trip energy efficiency of the system is 90% and depends on the depth of discharge. The energy transfer between the strings can happen during charge or discharge and the average values are 5.5% (during charge) and 2.47% (during discharge) of the total discharged energy. Minimum capacity loss was recorded for the lead-acid cells and practically no capacity degradation for the li-ion cells. (C) 2022 The Author(s). Published by Elsevier Ltd.
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