DC micro grids are becoming more and more common because of their simple integration with renewable energy sources and the growth of loads that are compatible with DC power. DC micro networks are very vulnerable to variations in power supply due to the high concentration of renewable energy sources in these grids. As long as voltage stability is taken into account, this is hazardous. A battery-based energy storage system and a hybrid energy storage system (HESS) that combines a battery and a super capacitor (SC) are suggested as ways to absorb these internal oscillations. Super capacitors and batteries are a great match for HESS applications because of their opposing qualities. The HESS is connected to the dc micro grid using a bidirectional, double-input converter. The power of the super capacitor and battery may be independently controlled using this bidirectional converter. A converter modelling technique for the double-input bidirectional converter is presented in this thesis. Based on this, a controller was created for a DC micro grid's voltage regulating application. The converter's function allowed the controller to function as a single unit for both the HESS charging and discharging processes. While preserving the dc micro grid's voltage stability, the developed controller was also able to reject disturbances from the source side as well as the load side. Simulation results were used to verify the converters' operation and the developed controller's performance in terms of voltage stability for both battery-only and hybrid energy storage systems.

super capacitor, bidirectional converter, dc micro grid, hybrid energy storage system