The use of hybrid storage systems has become a global solution in recent years to supply electronic devices with reliable, continuous and clean energy. Several benefits of energy storage systems can be properly combined through the use of these technologies and an adequate energy supply for specific uses can be achieved. In today's world, there is a constant global requirement for more energy, which has to be cleaner at the same time than energy produced by traditional generating technologies. This has encouraged the penetration of distributed generation technologies and, in particular, renewable energy sources. This paper also discusses various kinds of energy storage devices and studies their demerits and merits of these devices. The observations made from different types of renewable energy sources and their functions in hybrid systems are then analyzed. Certain energy storage systems have been simulated and modelled. In hybrid storage devices, the necessary electronic power circuits have been introduced. Finally, some realistic examples of a hybrid power system such as a battery supercapacitor are modeled, simulated and presented.