Abstract: Incorporating the controllable source-load into the energy storage control system in the DC microgrid in the form of virtual energy storage can provide a feasible solution for the system to efficiently complete the coordinated optimization of source-load-storage energy. This paper firstly establishes a virtual energy storage model for wind turbines and seawater based on the conversion relationship between the rotational kinetic energy of wind turbines and asynchronous motors and capacitive energy storage. Since electric vehicles have both mobile load and energy storage characteristics, the electricity price mechanism is used to formulate an orderly charging and discharging mode, and to establish a virtual energy storage model for electric vehicles. Secondly, an economic optimization model of the virtual energy storage system is established in conjunction with the source, load, and storage system to maximize the operating income of the microgrid during the day, so that an energy collaborative optimization control strategy is formed with the virtual capacitance value and the virtual state of charge in each period as the operating parameters. Finally, it is verified by simulation that the coordinated optimal control of source-load-storage energy can not only relieve the regulation pressure of energy storage in the DC microgrid, but also significantly improve the operating economy of the microgrid.