Abstract
This work proposes a novel control scheme for a variable speed wind turbine system based on the permanent magnet synchronous generator. Regions II and III for a wind speed profile are considered, hence the control is designed for maximizing the generated power from the wind turbine when the wind speed is below the nominal wind speed, and to saturate the generated power when the wind speed is above its nominal value in order to avoid damage to the system. Based on nonlinear models, the control scheme is also designed for introducing robustness to the closed-loop system. The pitch angle reference signal is also designed based on a mathematical model of the system, yielding in that way to a great performance of the wind turbine as predicted by the numeric simulations.
Highlights
In recent years, the demand for electrical energy has been an important aspect in a global context, where fossil fuels are the main sources for the generation of electrical energy
Despite the efforts made by researchers for controlling variable speed wind energy systems, there is a need for designing suitable controllers for Regions II and III that can be robust to unknown bounded perturbations and plant parameters’ variations, along with a clear design of both β re f and the corresponding pitch angle controller
For Region II, we propose a controller based on the sliding mode technique for the regulation of an optimal rotor speed based on maximum power point tracking (MPPT), where the super twisting algorithm (STA) is used since it alleviates the well known chattering problem [12,13]
Summary
The demand for electrical energy has been an important aspect in a global context, where fossil fuels are the main sources for the generation of electrical energy. Despite the efforts made by researchers for controlling variable speed wind energy systems, there is a need for designing suitable controllers for Regions II and III that can be robust to unknown bounded perturbations (wind fluctuations) and plant parameters’ variations, along with a clear design of both β re f and the corresponding pitch angle controller. For Region II, we propose a controller based on the sliding mode technique for the regulation of an optimal rotor speed based on MPPT, where the super twisting algorithm (STA) is used since it alleviates the well known chattering problem [12,13]. In this region, β re f is fixed to zero.
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