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Relying on Gansu's million-kilowatt wind power base, a 100MW/400MWh energy storage power station is built near the 330kV substation. A shared model is established on the grid side to explore new business forms of energy storage applications in Gansu. The shared energy storage power station resources do not exclusively belong to any certain new energy station. Instead, taking the power grid as a link, the independent and scattered grid-side and power source-side energy storage power station resources are integrated and uniformly coordinated to serve all new energy stations within the grid, promoting the full release of energy storage capabilities at all ends of the source-grid-load. The phase I constructs a 50MW/200MWh power station, adopting a combined energy storage scheme of compressed air + lithium battery. The compressed air installation capacity is 10MW/110MWh, and the lithium batteries installed capacity is 40MW/90MWh. An energy management EMS system is used for coordinated control.

The shared energy storage power station adopts compressed air and lithium battery coupling technology. Compressed air is used as the energy storage medium, which is compressed and stored excess power and released to drive a turbine generator to generate electricity when needed. The system effectively improves energy utilization and reduces energy loss. The lithium battery system is used as a fast-response auxiliary energy storage unit, which can release electrical energy in an extremely short time to meet the instantaneous needs of the power grid and improve the flexibility and stability of the entire system.The project is equipped with an energy management EMS system that receives grid-side AGC instructions to realize coordinated peak shaving and frequency modulation functions. 

The energy management EMS system is based on integrated coordinated control. It analyzes different types of energy storage control strategies and can be coordinated with conventional power sources. While realizing system power balance, it also takes into account the conventional units climbing ability deficiency.

The electrochemical energy storage system has a faster adjustment speed, its adjustment ability needs to be fully utilized in power distribution and transient support. The energy management EMS system meets the needs of rapid power distribution and collaborative functions according to the needs of grid support, and realizes the automatic sequential control of the energy storage process and energy release process in the hybrid energy storage system; logical coordinated control between subsystems (heat storage and heat exchange subsystem, air compression subsystem, turbine power generation subsystem, high-pressure gas storage subsystem).

Precise control makes the efficiency of the compressed air energy storage system approach 75%, which is equivalent to pumped storage. The control system contains multiple regulation modes: coordinated control, tracking plan, suppressing fluctuations, compensating power curves, system peak shaving, precise load shedding control, primary frequency modulation, and reactive power voltage regulation.

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