The large-scale application of energy storage technology on the new energy generation side will change the income of power grid company. Reasonable arrangement of the power grid in the purchase of electricity in various energy markets is an effective solution to improve operating efficiency. The power purchasing model based on the combined system of new energy-energy storage is proposed in accordance with the capacity optimization ratio scheme of the energy storage system in the new energy power station and

with consideration of the medium-and-long-term power purchase business and the spot market

the power trading strategy model based on value-at-risk is set up. With maximum benefit of purchasing and selling powerandminimumrisklossastarget

thepowerpurchasestrategyandtheimpactofenergystorageonrevenue are studied. The simulation results of the calculation examples show that

in case the on-grid electricity price of new energy is lower than that of thermal power

the large-scale application of energy storage technology in new energy power stations will bring considerable benefits to the power grid company.