V2G utilizes on-board power batteries to store energy for the grid, achieving vehicle grid interaction, reducing the impact of large-scale renewable energy grid connection and mass electric vehicle charging on the grid, and improving the stability of the grid. At the same time, the aggregation of a large number of electric vehicles in residential areas and office parks can also achieve peak valley arbitrage, dynamic capacity increase, load side response, and emergency power supply functions through unified EMS management. For home users, V2H devices can be used to achieve household energy storage of power batteries.