Energy storage system applied to pump room

The active principle of pumped hydro storage is to use “surplus” electrical energy to pump water from a lower to an upper reservoir. In this way electrical energy is converted into Figure 1. Underground pumped hydro scheme potential energy. The stored energy is proportional to the mass of the water and the vertical height.

Pumped-Hydro Energy Storage Energy stored in the water of the upper reservoir is released as water flows to the lower reservoir Potential energy converted to kinetic energy Kinetic energy of falling water turns a turbine Turbine turns a generator Generator converts mechanical energy to electrical energy K. Webb ESE 471 7 History of PHES

There are different technologies available for energy storage but, on a global scale, most of the energy storage capacity comes from large installations of Pumped Hydro Energy Storage (PHES) . Today, it is a well-known technology offering water storage and easy installation and maintenance due to its simplicity and maturity, .

Pumped storage plants are a combination of energy storage and power plant. They utilise the elevation difference between an upper and a lower storage basin. Pumps driven by electric motor– generators move water from the lower to the upper basin, thereby storing potential energy.

Pumped schemes energy by pumping water from a lower reservoir into an upper reservoir when there is a surplus of electrical energy in a power grid. the grid. They play an important role as they absorb energy from the system in periods with excess energy, and generate electricity when energy demand is high or a generator fails in the system.

Most pumped hydroelectric storages are designed to deliver their maximum output over a period of 4 to 9 hours. Systems with very large reservoirs, especially ones with a natural inlet, can deliver energy over much longer periods, some more than 100 hours. Pumped storage plants are technically suited to all existing energy markets.