ABSTRACT
This paper
presents the comparison between the standalone photovoltaic (PV) system with
battery-supercapacitor hybrid energy storage system (BS-HESS) and the
conventional standalone PV system with battery-only storage system for a rural
household. Standalone PV system with passive BS-HESS and semi-active BS-HESS
are presented in this study. Two control strategies, Rule Based Controller
(RBC) and Filtration Based Controller (FBC), are developed for the standalone
PV system with semi-active BS-HESS with the aim to reduce the battery stress
and to extend the battery lifespan. The simulation results show that the system
with semi-active BS-HESS prolongs the battery lifespan by significantly
reducing the battery peak current up to 8.607% and improving the average SOC of
the battery up to 0.34% as compared to the system with battery-only system.
KEYWORDS
1. Renewable
energy
2. PV
3. Hybrid
energy storage system
4. Supercapacitor
5. Battery
6. Control
strategy
SOFTWARE: MATLAB/SIMULINK
CONCLUSION
The BS-HESS
shows the positive impact to the battery and the overall system. The passive
BS-HESS is easy to be implemented, but the improvement is not significant as it
cannot be controlled. Therefore, semi-active BS-HESS is a better configuration
that improves the battery lifespan and maximizes the level of utilization of
the supercapacitor. The system with semi-active BS-HESS (moving average filter)
has significantly smoothened the battery current. The system with semi-active
BS-HESS (RBC) shows a great capability in battery peak current reduction and
the prevention of battery deep discharge by reducing the peak power demand by
8.607% and improving the average SOC of the battery by 0.34% as compared to the
system with battery-only system.
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