Independent microgrid is widely used in islands and remote areas.However

power imbalance often leads to the fluctuation of voltage and frequency

which suppress the development of AC microgrid.In view of this problem

a kind of energy storage optimization circuit structure based on full-bridge converter is proposed so to achieve the power balance and its power optimization of the micro grid.The structure has such features as simple structure and control as well as flexible power adjustment.In this paper

the working structure and mathematical model are analyzed firstly and the power model is established.Secondly

the control technology of active and reactive power of the full bridge structure is analyzed from the point of view of charge/discharge and inverter of capacitance.A kind of multi-mode power coordinated control strategy is adopted to adjust and optimize the target power

reduce the capacitive voltage at DC side and reduce the harmonic contents.Finally

the feasibility of the structure and control strategy is verified by simulation.To sum up

this topic is of great significance to the future promotion and application of AC microgrid.