Gravity energy storage is a new type of energy storage method, in which the energy storage medium is solid material, and the energy storage system is charged and discharged by lifting and lowering the energy storage medium based on the height difference. At present, there are mainly pumped storage, tower gravity storage, and underground vertical shaft storage There are four forms of gravity energy storage, including mountain based gravity energy storage.

The operation of the gravity energy storage system is divided into two working conditions: charging and discharging, and the energy conversion process is shown in the figure. Under charging conditions, the gravity energy storage system obtains electrical energy from the new energy side. The motor operates under electric conditions, and the rotor rotates to drive the mass block to move from a low potential energy level to a high potential energy level, converting electrical energy into gravitational potential energy. Under discharge conditions, the mass block is released from the high potential energy level and moves towards the low potential energy level. The reverse drag motor rotor generates electricity, and the gravitational potential energy is converted into electrical energy and fed back to the grid.