Load Distribution and Voltage Adjustment of Microgrid Based on Reference Voltage Compensation Strategy.

Maintaining the reasonable distribution of load current while regulating the bus voltage balance among them is a challenging control issue in DC microgrids. Many cases have proposed a variety of schemes to realize load current sharing and voltage balance for DC microgrid systems with single load or constant current load, but few have considered the problem of voltage regulation and load distribution in the face of multiple distributed generation units and non-constant current loads. For a type of DC microgrid system with n groups of distributed power generation units and non-constant current load units, a new strategy for indirectly adjusting the bus voltage by compensating the reference voltage of the converter is proposed. This strategy realizes load current sharing and bus voltage balance by using the proportion of micro-source output in the total load and the regulation of bus voltage feedback signal, so as to improve the accuracy of load distribution and the ability of voltage regulation. The Hurwitz stability criterion proves theoretically that the proposed control strategy can stabilize the system. Finally, the simulation and experimental analysis of the DC microgrid under different conditions are carried out through MATLAB and the intelligent microgrid experimental platform to verify the effectiveness of the proposed control scheme.