In today's society to the energy and power supply quality and safety and reliability requirements more and more high, the traditional large power supply because of its defect itself cannot have satisfied the requirements. Can integrate the new grid of distributed generation micro grid arises at the historic moment, it can save investment, reduce energy consumption, improve the system security and flexibility, is the development direction of the future. Capacitance as essential in micro grid energy storage system, plays a very important role. Super capacitor as a new type of energy storage device, with its irreplaceable advantage, become a micro grid (Microgrid) one of the energy storage device of choice.