China
Africa
Explore chapters and articles related to this topic
Hydropower
Published in Robert Ehrlich, Harold A. Geller, John R. Cressman, Renewable Energy, 2023
Robert Ehrlich, Harold A. Geller, John R. Cressman
At some locations on Earth, the daily variation of the tides has been harnessed to generate electricity and for other useful purposes. To date, however, tidal power has not been widely used, and it has proven quite expensive compared to some other renewable sources such as wind. In fact, the first and so far only one of a handful of tidal power stations (240 MW power) was completed at La Rance, France, in 1966. Tidal power is often considered to be suitable only to certain restricted locations having unusually high tides, and thus, its total potential that can be practically exploited around the globe is generally thought to be limited. Where conditions for its exploitation are right, tidal power does offer some advantages over some other renewable energy sources, however, in view of the predictability of the tides, compared to highly intermittent sources such as wind. Thus, if the availability and cost issues can be overcome, it could prove to be a very feasible means of generating electricity.
Future Energy and Energy Security
Published in Anco S. Blazev, Energy Security for The 21st Century, 2021
A great disadvantage to tidal power is the mass extermination effect a tidal power plant could have on plants and animals in the local estuaries. Tidal barrages can change the tidal level in the basin and increase the turbidity, or the amount of solid matter in suspension in the water. They can also negatively affect navigation and recreation, including damaging boats and hurting people caught in the tidal currents.
Green Technology Products for Sustainable Development
Published in Miguel A. Esteso, Ana Cristina Faria Ribeiro, A. K. Haghi, Chemistry and Chemical Engineering for Sustainable Development, 2020
Tidal power is a type of hydropower that converts the energy of the tide into power or other valuable types of energy. Tidal power draws on energy inherent in the orbital characteristics of the earth–moon system, and to a lesser extent from the earth–sun system. Though being predictable, it is an intermittent source of energy that supplies energy only when the tide surges. While the rise and fall of the tides—in some cases more than 12 m—creates potential energy, the flows due to flood and ebb currents create kinetic energy. Both forms of energy can be harvested by various tidal energy technologies.
Prediction, investigation, and assessment of novel tidal–solar hybrid renewable energy system in India by different techniques
Published in International Journal of Sustainable Energy, 2019
Tidal power or tidal energy is a form of hydropower that converts the energy obtained from tides into useful forms of power, mainly electricity. Although not yet widely used, tidal energy has the potential for future electricity generation. Tides are more predictable than the wind and the sun. The tide or wave is a periodic rise and fall of the water level of the sea. Tides occur due to the attraction of seawater by the moon. Tides contain a large amount of potential energy which is used for power generation. When the water is above the mean sea level, it is called flood tide. When the water level is below the mean level, it is called ebb tide. The ocean tides rise and fall and water can be stored during the rise period and it can be discharged during fall (Guerra, Cienfuegos, and Thomson 2017). A dam is constructed separating the tidal basin from the sea and a difference in water level is obtained between the basin and the sea. During the high tide period, water flows from the sea into the tidal basin through the water turbine. when the tides raise above tidal basin then turbine unit operates and generates power, as it is directly coupled to a generator. Tide changes proceed via the following stages: Sea level rises over several hours, covering the intertidal zone; flood tide. The water rises to its highest level, reaching high tide. Sea level falls over several hours, revealing the intertidal zone; ebb tide. The water stops falling, reaching low tide (Khan and Iqbal 2005; Khare, Nema, and Baredar 2012).
Reliability Modeling of Reservoir-Based Tidal Power Plants for Determination of Spinning Reserve in Renewable Energy-based Power Systems
Published in Electric Power Components and Systems, 2019
Mostafa Mirzadeh, Mohsen Simab, Amir Ghaedi
Different levels of water between the sea side and the reservoir determine the values of the generated power in the reservoir-based tidal power plant. Because of the vast variation in the water level arisen from the tide occurrence, the output power of tidal power plants varies with time and so the increasing penetration level of tidal resources into power systems results in some challenges. Thus, for the sake of integration of large-scale tidal power plants into the bulk power system, novel techniques are required to develop that may be different from those incorporated in conventional plants. Unlike other renewable resources such as wind speed and solar radiation, the accuracy of tide height prediction is very good and, as a result, large-scale tidal power plants can be used for power systems operation studies. However, the intermittent nature of water levels in tidal power plants affects the reliability model of the plants that can be used for reliability-based operation and planning studies of power systems and so new techniques must be introduced for studying this effect. In return, many studies have been performed for tidal power plants integration into power systems. In [4], the occurrence of tidal phenomena as a result of the gravitational traction of the moon is explained. Later, single and double basins as two different types of tidal reservoirs, three different operation modes of reservoir-based tidal power plants including ebb, flood and two-way generations along with effects of these sustainable power plants on the environment are investigated. In [5], a novel method for estimation of tide uncertainty is presented. In this approach, the lower upper bound estimation method is used for training neural network (NN) and current speed and direction variations of tide are estimated with good accuracy. It is shown in [6] that different electrical generators can be used for electric power extraction from tides. In this article for the current type of power plants, the synchronous or double fed induction generators are proposed and for the reservoir-based tidal power plants, is suggested to implement synchronous generators.