It means using electrical energy during the low electrical load period to pump water to the upper tank, and then releasing the water to the lower tank to generate electricity during the charging period state-of-the-art electricity.
The water in the reservoir upstream of the pumped storage plant is equivalent to stored electrical energy, while the reservoir downstream is equivalent to a large “power bank” . Pumped storage power plants can use excess electricity from the power grid to run motors at night when power consumption is low to pump water from downstream reservoirs upstream and store it for during the day, when energy consumption is at its maximum, water from the reservoirs can be stored. pumped to drive turbines to carry out work, converting the potential energy of water into electrical energy.
Pumped storage power plants can adjust the peak and valley differences of the power grid and improve the stability and reliability of the power system. They constitute an important means of energy storage.
According to the meaning of the question: during the operating hours of the water pump, the quantity of water pumped is G = mg = ρvg = 1.5×10 9 N. The operating time of the water pump is t = 5 h, and the height of the water rise is h = 400 m. According to P = W / t and obtain P = G h / t. Substitute the numerical calculation and obtain P ≈0.33×10 7 W
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