Abstract: Aiming at the output uncertainty and load fluctuation of distributed energy such as wind power and photovoltaic in DC microgrid, taking hybrid energy storage as the research object, a voltage and current double closed-loop control of hybrid energy storage system is proposed, which is coordinated with wind solar DC/DC converter to realize real-time control of DC microgrid voltage. Firstly, the mathematical models of wind power, photovoltaic, hybrid energy storage and DC/DC converter are established respectively, and the correlation of each part of power, port voltage and current is derived. Based on this, the corresponding collaborative controller is designed. Secondly, to derive a unified model of wind power, photovoltaic power and energy storage interface converters with the same form through a state transformation matrix, so as to realize the control of bus voltages of isolated DC microgrids. Finally, the simulation results of DC bus voltage tracking for different operating conditions show that the proposed control strategy has a fast response time, strong anti-disturbance capability and good stability effect for DC bus voltage fluctuations.