In today's society, the quality of energy and power supply, as well as the security and reliability of the demand is increasingly high, the traditional power supply mode of large power grid can not meet this requirement because of its own defects. Microgrid, a new type of power grid that can integrate distributed generation, emerges as the times require. It can save investment, reduce energy consumption, improve system security and flexibility, and is the future development direction. As an essential energy storage system in microgrid, capacitance plays a very important role. As a new type of energy storage device, supercapacitor has become one of the preferred devices for micro grid energy storage with its irreplaceable advantages. The role of super capacitor energy storage system in power grid: Short term power supply Used as energy buffer Improving power quality of microgrid Optimize the operation of micro power supply