As pumped storage is the consumption of water power and electricity generated in the pumping cycle from the lower reservoir to the upper reservoir, it is said that pumped storage power plants are net consumers of electricity. This is also the difference between traditional hydropower stations and pumped storage power stations. At the same time, the round-trip efficiency of these power grids is as high as 80%, so it is also efficient, and it can be reflected in the aspect of balancing the load in the entire power system n. The potential and price difference of key auxiliary grid services provided during peak and off peak periods may make pumped storage facilities very economical.
Advantages: fixed capacity and reserve (increment and decrement), reactive power, black start capability and rotation reserve. When generating electricity, the turbine generator can quickly respond to the frequency deviation as the traditional water power, thereby improving the overall balance and stability of the power grid. Engine motor excitation, which can be changed to increase the load and stable voltage of reactive power in turbine and pump mode. When there is no power generation or pumping, the machine can operate in the pressure regulating mode at the same time, or it can operate to provide rotating standby, providing the ability to quickly cut off load or balance excess power generation.