In this paper, a new type of hybrid energy storage system with high power density and high energy density and its power regulation method was studied, so as to meet the renewable energy power to tame, micro power grid operation control, power grid peak clipping in valley, wind/photo-voltaic energy storage power supply joint diversification of power grid environment, such as power supply, emergency power supply for long-term energy supply of energy storage system power throughput and performance requirements, and can effectively reduce the cost of investment, energy storage system for energy storage system of large-scale commercial operation provides an effective technical route.