Due to the fluctuating and intermittent characteristics of wind and solar power generation, the problems associated with integrating renewable energy and managing power system stability are becoming more and more prominent. Meanwhile, the severe impacts caused by large power system incidents highlight the urgent demand for high-efficiency, large-sc. With vigorous development of wind and solar power generation, it is difficult to realize complete absorption of renewable energy because of insufficient flexible resources and transmission corridor. Meanwhile, with the increase of wind and solar power penetration in power system, the intermittency and fluctuation will inevitably cause a volatility,. To maintain stable voltage and frequency of microgrid in different operational modes, microgrid has adopted with reasonable distributed generations and energy storage configuration in order to realize the transformation in different operational modes. During entry and exit of distributed generations, the power is out of balance in a short time, the. In order to fully develop and apply the energy storage technology, it is necessary to explore the application prospects of ancillary service market for energy storage. The ancillary services include peak-shifting, frequency regulation, fast start reserve, power quality and black start, etc. The energy storage can be used for rapidly frequency regul.