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Large optical storage system adopts fixed price to connect the grid without peak to valley price, so it can not make profit from peak to valley price difference. However, large-scale energy storage system has multiple value-added functions, which can provide peak adjustment, black start, demand response and other services for power grid operation, effectively realize peak cutting and valley filling, relieve peak power supply pressure and promote new energy consumption, It provides a new way for the safe and stable operation of power grid.

Peak load regulation: as an active energy storage equipment, the power storage power station can output power to the grid at peak load and share the power supply task of regional grid; When the power grid is in the valley load state, the power grid charges the energy storage station and stores the surplus electric energy in the power grid, which is similar to the pumped storage station. The power storage facilities built in the scenic power station shall be considered first, and the rich capacity can participate in the auxiliary service market, the electric energy storage facilities built on the power generation side or participate in the transaction of auxiliary service market as an independent subject; Or the electric energy storage facilities built on the user side can be regarded as distributed power supply sold to the power users nearby, and as the independent market entity, the peak load is adjusted in depth. Peak adjustment is subsidized, and the compensation standard is from 200 yuan to 1000 yuan / MWh.

Black start: when the power grid fails for a short time and long time or is completely black due to the fault, the energy storage station enters the corresponding operation state. The startup power of the power storage station is small and the success rate of one start is high. It can give priority to the power supply to the important load in the region, and the up recovery method is adopted to complete the black start of the power grid and accelerate the recovery process; The participation of energy storage power station in black start can effectively solve the problem of insufficient black start power supply in local power grid, which is of great significance to the recovery of power system after the power system crashes, and reduces the loss of large power outage; Compared with the traditional black start power supply, when the power storage power station participates in black start, the start-up speed is faster, more economical, more reliable and has a very broad prospect.

Demand response: the energy storage power station participates in the demand response of the power grid, which can stabilize the load of the grid, improve the power generation efficiency, reduce energy loss and protect the environment, thus achieving win-win results of the society, power grid, power plant and customers. This is the goal that the demand response can achieve, and can alleviate the problems of shortage of standby and transmission congestion, and help reduce the price fluctuation and reduce the risk of market participation, Participants can obtain certain benefits.