Method for controlling power supply, method for managing power and power system

PURPOSE: A power system and a method for controlling power supply and managing power are provided to instantly control power generated with steps in a power system by adjusting demand and supply of power in real time with a telematics system and mobility management function of a mobile network. CONSTITUTION: A power system includes a power center(100), vehicles(200) and a charging station(300-1,300-2,300-3). The vehicle includes a vehicle terminal comprising a telematics unit(210) and a charging control unit for vehicles(220). The charging control unit for vehicles continuously monitors charging state of an inner battery. The charging station includes a charger control unit(310), a power capacity controller(320) and a local energy storage device(330).