Energy in electric vehicle batteries can be used for multiple purposes, and these functions are generally defined as V2X applications. specifically, power stored in on-board batteries can be sold be the Grid in V2G (vehicle to Grid) function. When the Grid falls off,families can alternatively obtain power from EV battery for emergency household use, which is viewed as V2H (vehicle to home) function. Besides, the easy and efficient power conversion in V2G make it a vital node in realizing smart grid, small grid, energy storage system and etc,.