Real-Time Sensorless Robust Velocity Controller Applied to a DC-Motor for Emulating aWind Turbine
The wind power systems of variable velocity using a doubly-fed induction generator dominate large-scale electrical generation within renewable energy sources. The usual control goal of the wind systems consists of maximizing the wind energy capture and streamlining the energy conversion process....
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Format: | Artículo |
Language: | English |
Published: |
2021
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Online Access: | https://doi.org/10.3390/en14040868 https://www.mdpi.com/1996-1073/14/4/868/htm |
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Summary: | The wind power systems of variable velocity using a doubly-fed induction generator
dominate large-scale electrical generation within renewable energy sources. The usual control goal
of the wind systems consists of maximizing the wind energy capture and streamlining the energy
conversion process. In addition, these systems are an intermittent energy source due to the variation
of the wind velocity. Consequently, the control system designed to establish a reliable operation
of the wind system represents the main challenge. Therefore, emulating the operation of the wind
turbine by means of an electric motor is a common strategy so that the controller design is focused
on the induction generator and its connection to the utility grid. Thus, we propose to emulate the
dynamical operation of a wind turbine through a separately excited DC motor driving by a sensor-less
velocity controller. This controller is synthesized based on the state-feedback linearization technique
combined with the super-twisting algorithm to set a robust closed-loop system in the presence of
external disturbances. A robust velocity observer is designed to estimate the rotor velocity based on
the armature current measuring. Furthermore, a robust differentiator is designed for estimating the
time derivative of the velocity error variable, achieving a reduction in the computational calculus.
Experimental tests were carried using a separately excited DC motor coupled with a dynamometer
to validate the proposed wind turbine emulator. |
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