OPTIMIZING PERFORMANCE OF A BATTERY/ULTRA CAPACITOR FOR ENERGY STORAGE SYSTEM IN HYBRID POWER STATION

In this paper, a hybrid energy storage system is devised using Electro-Chemical Double Layer Capacitors (Ultra- Capacitors) and batteries. The objective of the work is to design and analyze a hybrid energy storage system in order to achieve optimal power flow from sources considering load demand. Electro-Chemical Double Layer Capacitors are suited to supplying loads of short duration and high power, while batteries are better suited to supplying loads of long duration and low power. The loads on a domestic system are a combination of long duration low power demand and short duration high power demand. The relative strengths of batteries and super-capacitors lend themselves to supplying the two components of load. This work seeks to quantify what gains may be made by combining lead acid batteries and ultra-capacitors in a hybrid energy storage system and dispatching the two components to supply the load components suited to their strengths.