If the current load is unevenly distributed among the units, it may lead to overloading of the power electronic equipment, which not only reduces the efficiency of the whole system, but also triggers equipment damage. Similarly, improper voltage regulation can reduce the reliability and quality of power supply. Therefore, in order to guarantee the stable and efficient operation of an islanded microgrid, power distribution and voltage regulation must be precisely controlled. In this paper, an adaptive consistency control method for multi-machine parallel connection of scaled energy storage converter is proposed to restore the average bus voltage to the rated value and realize the distribution of reactive power output from the energy storage unit in proportion to the capacity. Frequency restoration and active power optimization control are designed in frequency control to achieve frequency without difference in secondary control, while controlling the incremental cost of each energy storage unit to be consistent, accomplishing the power optimization goal, and thus guaranteeing the reliability of microgrid system operation.