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Proceedings ArticleDOI

Adjustable concentric towers to vary tower shadow effect on flicker in wind turbine

TL;DR: In this article, the authors developed a facility to find the impact of tower shadow effect on voltage flicker initiated in the wind turbine output, where a tubular tower is formed using pipes.
Abstract: In this paper the facility to find the impact of tower shadow effect on voltage flicker initiated in the wind turbine output is developed. Concentric towers are developed using steel any suitable material pipe. The length of the pipe can be adjusted using sliding the pipe. Nut and bolts are used to fix the length of the pipe. There is a provision to fix the turbine on the tower. Tubular tower are formed using pipes. Pipes with different diameters are provided in the test set up. As length and height of the towers is varied the tower shadow effect is also varied. Artificial wind is created using blower fans. The impact of tower shadow effect on the voltage flicker output of the wind turbine is observed on digital storage oscilloscope. There is a provision to fix various types of generators on the towers. The experiment is conducted on the wind turbine scaled down models. The result can be scaled to the actual dimensions of the wind tower.
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Proceedings ArticleDOI
25 Jul 2012
TL;DR: An ice detection sensor system to prevent ice forming on wind turbine is designed and implemented and a TI series temperature sensor is chosen to measure the side parameters, input to a grey-model based prediction module, and send them to LEWICE system to predict the ice shape.
Abstract: Ice is an important factor for wind turbine system health monitoring Ice should be predicted and removed before forming on the blades If ice forms on the axle, it will give a friction force on the axle and damage the electrical system The objective of this paper is to design and implement an ice detection sensor system to prevent ice forming on wind turbine A TI series temperature sensor is chosen to measure the side parameters, input to a grey-model based prediction module to get the predicted values, and send them to LEWICE system to predict the ice shape

20 citations

Proceedings ArticleDOI
01 Dec 2013
TL;DR: In this article, dry ice cleaning (DIC) was used to clean the stator end windings of turbine generator in a power plant to protect the environment and enhance life of the machine.
Abstract: Surface electrical discharges and tracking in service are attributed to contamination of end windings in high voltage turbine generators. Unnoticed over a period of time, it deteriorates winding dielectric, results in low insulation resistance(IR), smaller polarization index(PI) number and higher tanδ. Dirty windings block the ventilation, increases power loss and reduce efficiency. Eventually, machine stalls with sudden earth fault. This paper discusses the novel purification method viz. Dry Ice Cleaning (DIC) to clean the stator end windings of turbine generator in a power plant. Effect of contamination on dielectric parameters of windings is emphasized. Traditional practices and cleaning agents to remove debris on overhangs are presented. New process of solid CO2 cleaning for dirt removal during overhaul is described. Techno-economic aspects in usage of this cryogenic material and technology are highlighted. Experience on 120MW, 11 KV turbine generator to enhance the life through DIC cleaning is presented. Condition assessment dielectric test results before and after DIC are depicted and compared. Recommendations are given to asset managers of power plants for eco friendly cleaning technology to protect the environment and enhance life of the machine.

18 citations

Proceedings ArticleDOI
25 Jun 2010
TL;DR: In this article, computer simulations based on the 2D incompressible steady flow were carried out to simulate the ice accretion on a static straight blade and the icing effects on the aerodynamic performance of the blade.
Abstract: Icing on blade surface of the straight-bladed vertical axis wind turbine is a common phenomenon in the cold and moist conditions, which affects the performance of wind turbine greatly. Computer simulations based on the 2D incompressible steady flow were carried out in this study to simulate the ice accretion on a static straight blade and the icing effects on the aerodynamic performance of the blade. The ice accretions on the aerofoil at some typical attack angles were calculated, and the changes of blade aerodynamics performance and flow fields around blade under icing condition were also calculated and discussed. The results show that the ice accretion and icing effects on blade aerodynamic performance are quite different at different attack angles.

16 citations

Proceedings ArticleDOI
01 Oct 2016
TL;DR: In this paper, a numerical study has been carried out to understand the effects of wind turbine blade profile geometric thickness on resultant ice accretion, which showed a decrease in ice growth and thickness at leading edge of the blade profile with the increase of its thickness.
Abstract: Choice of blade profile (airfoil) is a crucial step in wind turbine design for cold climate operations in order to obtain a competitive performance and to make a tradeoff between aerodynamic performance and structural requirements. A numerical study has been carried out to understand the effects of wind turbine blade profile geometric thickness on resultant ice accretion. Five different blade profiles (airfoils) were used for this study. Based upon the flow field calculations and the super cooled water droplet collision efficiency, rate and shape of accreted ice was simulated for dry ice conditions on each airfoil. Analysis showed a change in airflow and droplet behavior with the blade profile thickness. Results show a decrease in ice growth and thickness at leading edge of the blade profile with the increase of its thickness.

16 citations

Proceedings ArticleDOI
01 Oct 2016
TL;DR: The problem of icing detection is considered for wind turbines operating in medium speed wind region (Region 2) and subject to a control law tracking the Maximum Delivery Point of the power coefficient characteristic based on an observer of the rotor angular acceleration.
Abstract: In this paper the problem of icing detection is considered for wind turbines operating in medium speed wind region (Region 2) and subject to a control law tracking the Maximum Delivery Point of the power coefficient characteristic. Based on an observer of the rotor angular acceleration, rotor inertia is estimated in order to detect its eventual increase due to icing. Moreover, the observed value of rotor inertia can be potentially used for updating the controller parameters or to stop the turbine when icing is too severe. The proposed approach has been tested by intensive MatLab® simulations using the NREL 5 MW wind turbine model.

15 citations