Novel control strategy for dynamic load sharing between DC-DC converters for DC microgrid

DC microgrids have sources such as solar power plants, battery storage systems, fuel cell power plants. DC-DC converters are used in each of these systems to interface them with DC bus of the microgrid. For economically optimized operation of microgrid, it is necessary to have a control system enabling desired load sharing between the DC-DC converters. The solution described here is incorporation of DC-voltage droop characteristics in each converter. However embedding droop characteristics in the converters results in drastic voltage variations on DC bus with varying loads. To address this problem, a control system is incorporated which maintains a constant voltage on DC bus of microgrid by controlling the voltage axis intercept of droop characteristics. This paper describes the innovative control strategy of voltage droop characteristics as a potential solution to load sharing control problem for multiple DC sources and extends to design and simulation of a 48V DC bus.