S. S. Deo

Bio: S. S. Deo is an academic researcher. The author has contributed to research in topics: Wind direction & Wind gradient. The author has an hindex of 2, co-authored 2 publications receiving 48 citations.

Computation of flicker due to vertical wind shear in a wind turbine sited on a hill using wind tunnel

Abstract: In the paper empirical model of flicker initiated in a wind turbine sited on a hill is established. Paper offers ins and outs of impact of various shapes of hills on vertical wind shear and consequently on the flicker produced in the wind turbine which is sited on that surface. In the model vertical wind shear, length of the turbine blade, tower height, slope of the hill are reverberated. The exquisiteness of the model is that, it is expedient to sundry types of hills on which the turbine is sited. Postulations, boundary curbs and limitations of the model are also depicted.

Modeling of flicker in wind turbine on a green building due to vertical wind shear

Abstract: Paper confers a newfangled empirical model to figure, flicker, instigated in the horizontal axis, upwind turbine, due to vertical wind shear, in continuous operation. Postulations, boundary curbs and limitations of the model are also depicted. In the proposed model, vertical wind shear, number of blades, blade length and tower height are echoed. The elegance of the model is that, it is expedient to range of heights of buildings on which the turbine is sited. Substantiation of model is carried out with comparative graphs revealed after fervent experimentation on a turbine in a tunnel with various heights of models of buildings.

Investigation of Horizontal and Vertical Wind Shear Effects Using a Wind Turbine Emulator

Abstract: This paper presents modeling and analysis of horizontal and vertical wind shear effects using a wind turbine emulator (WTE) with a comprehensive model. These periodic effects generate power fluctuations and mechanical stress on the wind turbine (WT) components during its operation. The frequency of these fluctuations associates with the rotation speed and the number of blades, whereas the amplitude increases in larger turbines. Although the vertical wind shear effect was modeled in literature using WTEs, the simplified aerodynamic and mechanical models were considered for WTs. In this paper, in addition to the vertical wind shear, the horizontal wind shear is modeled in simulation and experiment using a WTE, which may have more severe effects. The utilized WTE employs a comprehensive model for the WT, which considers aerodynamic, mechanical, and electrical aspects. The interaction of different aspects and mechanical dynamics is included in the WTE, which utilizes AeroDyn and FAST software tools to model the aerodynamic and the mechanical aspects of the WT. A coupled induction motor-induction generator set was employed to develop the WTE, which is used to model the wind shear effects for a fixed-speed WT.

Numerical analysis of the spatial distribution of equivalent wind speeds in large-scale wind turbines

Abstract: The effects of wind shear and the tower shadow contribute to periodic fluctuations in the wind speed and aerodynamic torque, which cause several problems. This study develops an equivalent wind speed model for large-scale, n-bladed wind turbines that includes the wind shear and the tower shadow effects. The comprehensive model is used to derive the disturbance components of wind speed caused by wind shear, the tower shadow, their synthesis, and the equivalent wind speed and to delineate their spatial distributions in the rotor disk area. Simulation results reveal that the effects of wind shear, the tower shadow, and the equivalent wind speed on the disturbance components fluctuate periodically and are closely related to the wind turbine correlation parameters, such as the rotor radius, hub center height, tower radius, distance from the tower midline to the blade, wind shear exponent, and blade number.

Ice extraction from wind turbine using flow of hot air through blade

Abstract: In this paper high the ice accumulated on the wind turbine blade is removed by passing hot air through the blade. The hollow tubes are embedded in the wind turbine blades. The hollow tubes may be circular on cross section or of any suitable shape. The air is heated by an electrical heating or by gas geyser. First the air is compressed with help of a compressor. Then that air is passed through the electric heater or gas heater. The hot air is then passed through the wind turbine blade. When the hot air is passed through the wind turbine blade, the ice melts and falls down. Hot air is passed through the wind turbine blade after frequent intervals of time when the environmental conditions are favorable for icing. The process of deicing is fast.

Output voltage control scheme for standalone wind energy system

Abstract: This paper presents output voltage control scheme for standalone wind energy systems using self excited induction generator. Nowadays the energy need is depend upon conventional sources but the disadvantage of conventional sources are limited availability and high cost. So the use of non conventional sources must be increased as it is freely available in more amounts. One of the available source is wind energy Nowadays wind energy can be used for grid connected and standalone load demands. The wind nature is unreliable it is not constant so for backup storage device lead acid battery is used. In existing system the MPPT technique is without battery charging mode control has been implemented independently for standalone wind energy applications. As the wind nature is uncertain so we get variable output. As we fed wind output to the buck converter then harmonics are generated. In proposed system this can be accomplished by maximum power point tracking with battery backup when the wind power is not available. For meeting the requirements of 3 KW standalone dc load 4 KW wind battery hybrid system is used. This paper presents a wind energy control with buck converter. By using MATLAB/SIMULINK proposed system is modelled.

Impact of vertical wind shear on wind turbine performance

Abstract: This is paper presents significance of vertical wind shear. Voltage flicker that may be initiated in the output of the horizontal axis upwind wind turbine located at any given site for a given tower height and blade length. Vertical wind shear is one of the important parameters which instigate voltage flicker in wind turbine output voltage. In this paper diverse origins of flicker, places where wind shear occurs, computation of wind shear, general impacts of wind shear, impact of wind shear on wind turbine output is discussed.