The generators operate as motors driving the turbines as pumps during the pumping operation. The units operate as pumps accelerating the tidal effect at small water level difference between the storage basin and the sea and they operate as turbine when one level is considerably above the other. The units are designed for two-way operation-from storage basin to sea and from sea to the storage basin. The annual output of this plant is around 540 million kWh. This plant has 24 units of bulb type turbines, each of 10 MW capacity. Probably the best known and the most recent tidal scheme, which utilises the tidal energy for generation of electrical energy has been constructed in France at Ranee Estuary where a power station of 240 MW capacity has been in operation since 1967. The above source for generation of electricity has been vigorously investigated in some countries like France, Germany, UK, Canada and USA. This arrangement is costlier but provides greater flexibility and continuous power output. The principle of operation is illustrated in Fig. By using reversible water turbine the turbine can run continuously both during high tide and low tide. Though the arrangement explained above is simple and cheap but it is not useful due to variations in the output (the electric power generation is not continuous). The principle of operation is illustrated in Fig. Because of availability of low head bulb type units are employed for such projects. Thus the tidal energy stored at height can be utilised to drive a turbine coupled to an electric generator and thus generate electricity. For storing water in the storage basin the gates are opened at the time of high tide and after storing water the gates are closed.Īfter the tide has receded, there is a working water head between the basin water and open sea and the water is allowed to flow back to the ocean through water turbines installed in the dam. It will have large gates in it and also low head water turbines installed in it. For this a dam would have to be built across the mouth of the bay. The use of tides for electric power generation is practical in a few favourably situated sites where the geography of an inlet or bay favours the construction of a large scale hydroelectric power plant. There is an enormous amount of energy in waves and in tides but it is difficult to harness and control energy. The tide amplitude may be considerable 18 to 21 m have been noted near the Magellan Strait and the shores of America respectively. However at some places the various coastal complexities give good tidal patterns owing to resonant effects of local geography. In large portion of the world tidal ranges are very low (say 1 metre or so) and, therefore, not suitable for electric power generation. The rise and fall of tides nearly twice a day are associated with the rotation of earth every 24 hours in relation to both Sun and Moon. It can be predicted fairly accurately and is free from all types of pollutions. Tidal power also represents a permanent source of energy. Advantages and Disadvantages of Tidal Power 3. In this article we will discuss about:- 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |