Development of a Hybrid Energy Storage System using Batteries and Supercapacitors

The development of hybrid energy storage systems (HESS), which combine batteries and supercapacitors, has accelerated due to the need for dependable and efficient energy storage. Batteries have a high energy density, but their lifespan and charge/discharge rates are limited. Supercapacitors, on the other hand, have a lower energy capacity but offer long life and quick charging. This paper presents a low-cost, practical HESS for real-time energy delivery that uses inverter output control, supercapacitor buffering, and voltage regulation based on the LM317. Improved efficiency (up to 96%), thermal stability, and voltage regulation under variable load conditions are confirmed by experimental results. Applications for the system include solar-integrated energy units, UPS systems, and EVs.