A Design Study for Multivariable Feedback Control For a Variable Speed Wind Turbine

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The British University in Dubai
Electrical energy consumption is dramatically increasing due to industry developments and expanding of urban areas. Fossil fuels as an energy resource has many environmental and human health effects. Consequently, the demand for utilizing renewable clean energy arises. Wind energy is a significant source of energy since it is clean, renewable, and cost effective in comparison with other renewable resources like photovoltaic which has higher costs in production and maintenance. This research work deals with variable speed pitch controlled wind turbine and covers the modelling of wind turbines as an aerodynamic, mechanical and electrical system. The preliminary history of feedback control will be reviewed along with background of wind turbine developments. Moreover, the mathematical modelling of a Variable Speed Wind Turbine VSWT will be presented. This study is based on evaluating the performance and energy consumption of two controllers. The first controller is the new Least Effort controller which proved to have superior optimization of the consumed energy by the controller with a simple design using only proportional feedback. The other method is H-infinity controller with mixed sensitivity criteria. This controller results in a fast response but with heavy in energy consumptions and controller complexity. A comparison between the two control techniques showing the simulation results will be provided.
multivariable feedback control, wind turbine, electrical energy consumption, clean energy, wind energy, renewable resources