Power Generation/Hydro Power/Part3

Figure 4:Pumped storage scheme power station diagram ( Click on image to view full size image )

Pumped storage schemes are a convenient way of storing large quantities of energy which can be used during emergency or peaking times. Operation: During off-Peak hours, the plant draws electric energy from the electrical grid & uses that to pump water to the upper reservoir. When Peak time comes, the water from the upper reservoir is released & electric energy is generated in the lower reservoir. This cycle is repeated daily. By their nature, pumped storage schemes cannot be used as base load power stations. These are strictly used for peak time supply as they can be brought on-line quickly. Comparison: Hydro power plant Pumped storage plant Once water passes through penstock & turbine, it is released into the river Water is re-used by pumping and generative action of the scheme. Can be used for irrigation & flood control Can be used for pumping water from readly available areas to areas in need of water Can still be used as base load station can not be used as base load station as it can only generate for limited hours

As evident from above table, both power stations are very desirable for use that goes outside of electrical energy generation confines. This schematic diagram must be properly understood. it is the basis upon which pumped-storage scheme power station designs are done. the individual power station complexity may differ slightly to the schematic and yet over and above that will use the same principle.