Power Auxiliary Service and Business Model of Energy Storages with High Proportion of Renewable Energy

The research of the energy storage technology has been an important driving force for the development of renewable energy, and it has become a consensus in the electricity market to introduce energy storage technology into the power system with renewable energy. At present, the power auxiliary service market (PASM) in China is still in the construction period. With the increasing investment scale of the energy storage market, energy storage is widely appeared in the PASM. In view of this situation, this paper takes various parts of Northwest China as an example, introduces the application of energy storage technology in the field of renewable energy, discusses the five main auxiliary service types of frequency modulation, peak regulation, reserve, reactive power regulation and black start, and gives the corresponding cost and benefit model. Finally, the business model of the energy storage participating in power auxiliary service is analyzed, and four feasible solutions are given considering the investment mode and operation mode of energy storage system.