Comparative Analysis of Decoupling Control Methodologies and H∞ Multivariable Robust Control for Variable-Speed, Variable-Pitch Wind Turbines: Application to a Lab-Scale Wind Turbine

It is well known that the wind power has definitely certain impact on the grid power. Issues associated with the integration of wind power into the utility grid are interface issues, operational issues and planning issues. Interface issues include harmonics, reactive power consumption, voltage regulation and frequency control. Operational issues are intermittent power generation, operating reserve requirements, unit commitment and economic despatch. And planning issues are concerned with intermittent wind resources compared to conventional power resources. An important question, when connecting the wind turbine generators to the utility grid, is how much the power / voltage quality will be influenced, since the power production by wind turbines is intermittent, quantity wise as well as quality wise. This paper is focused on the on comparison between the constant speed wind turbines and variable speed wind turbines, reactive power consumption and harmonics generated by both wind turbines. Total harmonic distortion is calculated by the application of C++ software and a comparison is done between the generators with respect to the harmonics. It is observed that constant speed wind turbine generates low order harmonics and variable speed turbine generates high order harmonics. On the basis of results, some solutions are suggested to improve the wind power quality and to reduce reactive power consumption. It seems that variable speed wind turbines with electronic interface are better with respect to the utility grid point of view.

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Control of variable pitch, variable speed wind turbine in weak grid systems

2010 IEEE Energy Conversion Congress and Exposition ◽

10.1109/ecce.2010.5618327 ◽

2010 ◽

Cited By ~ 5

Author(s):

Xibo Yuan ◽

Jianyun Chai ◽

Yongdong Li

Keyword(s):

Wind Turbine ◽

Variable Speed ◽

Variable Pitch ◽

Grid Systems ◽

Weak Grid ◽

Variable Speed Wind Turbine

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Heuristic Coupling Design-Optimization between a Variable Speed Generator and a Wind Rotor

International Journal of Engineering Research in Africa ◽

10.4028/www.scientific.net/jera.32.133 ◽

2017 ◽

Vol 32 ◽

pp. 133-138

Author(s):

Cherif Khelifi ◽

Fateh Ferroudji ◽

Farouk Meguellati ◽

Khaled Koussa

Keyword(s):

Wind Turbine ◽

Output Power ◽

Wind Turbines ◽

Electricity Market ◽

Maximum Output Power ◽

Vertical Axis ◽

Mechanical Power ◽

Maximum Output ◽

Variable Speed ◽

Electric Generator

A high emergence of wind energy into the electricity market needs a parallel efficient advance of wind power forecasting models. Determining optimal specific speed and drive-train ratio is crucial to describe, comprehend and optimize the coupling design between a wind turbine-rotor and an electric generator (EG) to capture maximum output power from the wind. The selection of the specific design speed to drive a generator is limited. It varies from (1-4) for vertical axis wind turbines and (6-8) for horizontal axis wind turbines. Typically, the solution is an iterative procedure, for selecting the adequate multiplier ratio giving the output power curve. The latter must be relatively appreciated to inlet and nominal rated wind speeds. However, instead of this tedious and costly method, in the present paper we are developing a novel heuristic coupling approach, which is economical, easy to describe and applicable for all types of variable speed wind turbines (VSWTs). The principle method is based on the fact that the mechanical power needed of the wind turbine (WT) to drive the EG must be permanently closer to the maximum mechanical power generated by the (WT).

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