PUMPED STORAGE POWER STATIONS WITH REFERENCE TO THE DESIGN AND OPERATION OF THE PROPOSED NAGARJUNASAGAR PUMPED STORAGE SCHEME

Abstract

The great interest in pumped storage hydro-e3ectric plants today arises from the rued for peak power capacity of arq large power system. In this context a comprehensive review is called for of the well developed and highly diversified pumped storage technolog that has become prominent in recent years.. 74 major pumped storage power stations with €i capacity of over 11000 M.W. were in operation throughout the world as on 1965 and another 25 stations were planned with a capacity of approximately 6000 M.W., which are now either in operation or in advanced stage of construct ion. The possible purposes of pumped storage projects is given. The geographical areas in which pumped storage developments have been realised are also dealt. A 'complete listing and tabulation of all major pumped storage developments upto the year 1966 is Included4 The effect of geography and power economics on pumped storage developments is exemi d. A ' general description of the various equipments used in Pt4PGC1 storage developments is presented and the prevailing ranges of it capacity and hydraulic heads as designed at the present times are described. The evolution since 1945 of single runner reversible pump turbines for application to all operating heads upto 1300 ft has greatly extended the field of pump storage application at economic cost levels. Electrical equipment requirements of pumped storage hydro plants differ from those of conventional plants in several aspects particularly in starting techniques) ratings and protective features for the pumping mode of operation. Special consideration is also needed in the design of the generator' motor, the 0 excitation system, and the relaying equipment. As pumped storage is only one of several types of low cost peaking capacity, its installation must be justified in comparison with the optimum combination of all other available sources of generation. Installation of pumped storage will generally result in increased fuel consumption at thermal stations so that savings must be found in other operating and maintenance expenses or in initial costs. The cost of pumped storage is mainly a function other of site conditions, however/aspects being comparablle $ pumped storage costs will decrease with an Increase in head. The size determinations for pumped storage plants and the hydrodynamic and other technical features among their principal components is much more flexible and much more complex than for conventional hydro-electrical plants...