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Renewables—The Future’s (only) Hope!
Published in Anco S. Blazev, Energy Security for The 21st Century, 2021
A tidal power generation method more practical for small applications is depicted in Figure 7-39. Here the tidal waves are directed into a channel (or tunnel), where they speed one way when the tide comes, and back the other way when the tide goes out. A turbine is located in the channel and its blades turn with the tides coming in and out. The rotational energy is converted into electricity by an electrical generator, and is used in the power grid or for directly powering electrical devices.
The Other Energy Markets
Published in Anco S. Blazev, Global Energy Market Trends, 2021
Another, more practical for small applications, method for tidal power generation is depicted in Figure 6-23. Here the tidal waves are directed into a channel, where they speed one way when the tide comes and, and back the other way when the tide goes out. A turbine is located in the channel and its blades turn with the tides coming in and out. The rotational energy is converted into electricity by an electrical generator, and is used in the power grid or for directly powering electrical devices.
The Other Energy Sources
Published in Anco S. Blazev, Power Generation and the Environment, 2021
More practical for small applications is the tidal power generation depicted in Figure 3-36. Here the tidal waves are directed into a channel, where they speed one way when the tide comes and back the other way when the tide goes out. A turbine is located in the channel and its blades turn with the tides coming in and out. The rotational energy is converted into electricity by an electrical generator and is used in the power grid or for directly powering electrical devices.
Performance evaluation of Weibull analytical methods using several empirical methods for predicting wind speed distribution
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2020
The kinetic energy in the wind turns the wind turbine, which is either connected to a shaft with a generator to generate electricity or creates mechanical rotational energy for grinding grains, pumping water, or electricity generation. But, wind speed is varied every second that bringing challenges when fluctuates toward the wind turbine. Culler (Culler 2017) indicated the global wind speed can range from 0 to 175 m/s by using simulation models with 10-km resolution. But, the continents received the global wind speed range from less than 4 m/s to greater than 10 m/s at the 100 m above the surface (GWA 2013). The wind maps from simulation models provide only preliminary information and mostly neglected the local anomalous. The use of wind maps can predict the potential of wind-farm with the uncertainty of ±20% to wind energy and ±10 to 15% to wind speed (Daniels, Hoistad, and Turner 2019). The wind gusted as the sudden wind speed rises and falls cause superimposed on the mean wind flow to the wind turbine (Lemes, Guetter, and Andrade 2017). The wind gusts are likely making the extreme change in generated power characteristics to cause large fatigue loads on wind turbines (Cheng and Bierbooms 2001; Yass, Ali, and Hussein 2018; Zhou et al. 2018). This situation also makes the selection of wind turbine to be unique for each site and depends on the wind speed distribution.
A variable wind harvesting based induction generator using variable voltage and variable frequency converter for renewable energy applications
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2022
Ponarun Ramamoorthi, Karthigaivel Ramasamy, Suresh Muthusamy
Wind energy conversion system (WECS) is one of the popular renewable energy systems. In the WECS, the kinetic energy enclosed in the wind is harvested as mechanical energy in the form of wind turbine shaft rotation. The rotational energy harvested by the turbine is transferred to the electrical generator through a common shaft running between the turbine and the generator or through a gearbox in between (Molinas, Suul, and Undeland 2010). In induction generator (IG), since the number of poles is usually small, they operate at higher speeds, and a gearbox is usually used in between the turbine shaft and the generator shaft. The turbine shaft is referred as low-speed shaft and the generator shaft as the high-speed shaft (Górski and Iwański 2021).
Wind energy potential, development and current trends in India: a review
Published in International Journal of Ambient Energy, 2018
Wind energy is the one form of solar energy. Wind energy is generated by the movement of air from high pressure to low pressure. Wind blows because of differences in air pressures from one location to another. If the pressure difference is very high, then the wind blows very fast. It never follows a straight line path. The wind energy is extracted from the air stream with the help of wind turbines. It produces rotational mechanical energy and by the generator converts the rotational energy into electrical energy. Wind energy is renewable, widely distributed and produces no greenhouse gases during operation (Sharma et al. 2012). Wind is a clean, renewable energy source that produces minimal environmental pollution. Operating costs are almost nil.