Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

Rossander, Morgan; Goude, Anders; Eriksson, Sandra

doi:10.3390/en10111699

Cited by 4 publications

(2 citation statements)

References 28 publications

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“…This is the load on the generator. This approach is used in systems with a direct connection to the network, and in low-power wind turbine plants and it is very common (Rossander, Goude, Eriksson, 2017;Yang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

Augustyn

2020

Technical Transactions

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The proposed self-adjusting mechanism consists of a carousel rotor with a vertical axis consisting of two kinematically connected flat blades. The torque of this rotor can change the position of the directing unit and additionally the position of the main propeller in order to direct the wind stream or save the main rotor when the wind is too strong. The theory, principles of operation, and the properties of the self-adjusting system were illustrated by formulas and graphs. Based on research conducted in a boundary layer wind tunnel, the values of the aerodynamic coefficients of the flat blades were determined, and then the power and propeller torque of the rotor were found as a function of the angle of wind attack. A computational procedure provides kinematical and force relations as well as the resulting torque diagrams of the rotor. An example of the use and the design structure of a self-adjusting unit in the case of a horizontal axis wind turbine is presented.

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Section: Introductionmentioning

confidence: 99%

A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

Augustyn

2020

Technical Transactions

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“…The second is 'cut-off speed' at which the wind turbine must be stopped to avoid possible damage of rotor and other components. Rossander et al (2017) propose the control system, which is based on keeping the turbine rotation at preferable operation region. The operation principle of the controller is based on torque control.…”

Section: Introductionmentioning

confidence: 99%

A comparative ANSYS-based force analysis of a new horizontal-axis semi-exposed wind turbine

2019

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Renewable energy sources are growing fast. Nowadays, much effort has been made by inventors to devise new and more efficient configurations of wind turbines. This article describes the mechanical design and resultant force dynamic simulation of an innovative horizontal-axis semi-exposed wind turbine structure. The innovation in wind turbine structure includes the flat shape of its blades and their orientation towards the wind that minimizes the axial component of wind force on the shaft bearings. As a result, wind power is fully utilized to generate a useful rotary force that drives the generator rotor. This enhances the efficiency of the turbine as compared to complex shape blades in traditional horizontal-axis wind turbines. The distinctive feature of the system is also an oscillating shield that automatically protects the generator shaft from overspeeding at extreme wind speeds and, therefore, from generating power above its nominal capacity. The overspeeding may even cause physical damage to the generator. The force analysis of the new wind generator has been conducted for various wind conditions by using ANSYS Fluent. The results are compared to a traditional three-blade horizontal wind turbine to prove the ability of the new semi-exposed wind turbine to collect more driving torque on the shaft. The results of the simulation show the efficiency of the system and the advantage of using this system with the overspeed shield protection.

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ANSYS-based Force Analysis on a New Horizontal Axis Wind Turbine Shield

Seitenov

Mir‐Nasiri

Ali

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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The importance of renewable energy sources cannot be denied in the era of increase of greenhouse gas emission and depletion of fossil fuels. The wind energy and design of new yet effective windmills become a necessity nowadays. This paper introduces a new configuration of wind turbine with a horizontal axis and ANSYS-based dynamic analysis of its high-speed protection shield that protects the turbine from overspending at extreme wind conditions. In comparison to traditional horizontal wind turbine structure, HAWT blades have a flat shape, and they are exposed to wind stream in such a way that the wind forces are strictly perpendicular to the blade surfaces. This structure extracts more wind energy and minimizes the useless forces affecting shaft joints in traditional wind turbines. The ANSYS-based force analysis presented in this paper proves the advantage of using of protection shield in such windmill structure.

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Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

Cited by 4 publications

References 28 publications

A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

A vertical-axis rotor as the adjusting system of a horizontal axis wind turbine

A comparative ANSYS-based force analysis of a new horizontal-axis semi-exposed wind turbine

ANSYS-based Force Analysis on a New Horizontal Axis Wind Turbine Shield

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