Impact of power sharing method on battery life extension in HESS for grid ancillary services

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Bahloul, Mohamed
Khadem, Shafiuzzaman K.
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Institute of Electrical and Electronics Engineers (IEEE)
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Hybrid energy storage system (HESS) based on Li-ion and supercapacitor (SC) can play a potential role to stabilise the grid by providing the fast frequency ancillary services. The SC helps to reduce the battery charge/discharge stress and hence assists to extend the battery lifespan. The power sharing method (PSM) is the heart in control part to improve the HESS performance and reduce the battery stress. This paper proposes a hybrid PSM and investigates its impact on battery life extension along with its relation to the system design and regulation signal. The performance of hybrid PSM is compared with three other PSMs (low pass filter, first and second rule based) in a 10 MW / 10 MWh full-active parallel HESS for frequency regulation service in two networks: UK (national grid) and USA (PJM). Considering maximum possible battery lifetime up to 25 years, result shows that the hybrid PSM approach allows a degree of better performance for both grid while the sharing of SC is kept maximum 2.0% and 2.5% (for US and UK grid respectively) of the HESS capacity. This study also analyses the impact of PSM on shared capacity and design of HESS for different grid regulation signals.
Batteries , Topology , Frequency control , Stress , System analysis and design , Microgrids , Ancillary services , Fast frequency response , Hybrid energy storage system , Power sharing , Battery lifespan
Bahloul, M. and Khadem, S. K. (2018) 'Impact of power sharing method on battery life extension in HESS for grid ancillary services', IEEE Transactions on Energy Conversion, In Press, doi: 10.1109/TEC.2018.2886609
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