Coordinated operation control strategy and droop improvement method for DC microgrid

The permeability of renewable energy in the microgrid is relatively high, and its intermittence will lead to the fluctuation of power supply in the system. At the same time, the sudden change of load and switch will cause voltage flicker and drop of DC bus, which will threaten the stable operation of the system. The DC microgrid composed of photovoltaic power generation, battery energy storage device, grid converter and DC and it is used as the research object load in this paper, what's more, based on the bus voltage information, the operation control strategy of microgrid is designed to realize the independent operation of the microgrid, such as parallel in and off the grid. Aiming at the problem of uneven voltage drop and power distribution in traditional droop control, an improved droop control based on hybrid compensation is adopted to realize bus voltage stability and power sharing in the system. Finally, simulation analysis is carried out, and the experimental results verify the feasibility of the control strategy mentioned above.