The invention provides a wholly-balanced micro-grid system, and belongs to the technical field of micro-grids. Distributed power supply mathematical models, a system based on a matlab/Simulink simulation system and a control method of the system are established, a photovoltaic and storage battery energy storage system and a model of a diesel generator are erected, and in combination with system modules, an integrity simulation model of an alternating current micro-grid is established. The scientific research significance is achieved, the problem of grid fluctuation can be solved in reality, a simulation test is conducted on influences of output of distributed power supplies on system operating characteristics of the system under various working conditions, the result shows that the established alternating current micro-grid model can accurately simulate the actual operating condition of the system, and the technical support is provided for operation and planning of the micro-grid.