Exhaustive Comparison between Linear and Nonlinear Approaches for Grid-Side Control of Wind Energy Conversion Systems

In this paper, we propose a comparative study of linear and nonlinear algorithms designed for grid-side control of the power flow in a wind energy conversion system. We performed several simulations and experiments with step and variable power scenarios for different values of the DC-link capacity w...

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Bibliographic Details
Published inEnergies (Basel) Vol. 14; no. 13; p. 4049
Main Authors Azelhak, Younes, Benaaouinate, Loubna, Medromi, Hicham, Errami, Youssef, Bouragba, Tarik, Voyer, Damien
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.07.2021
Subjects
Active damping
Algorithms
Alliances
Comparative studies
Control algorithms
Control theory
Controllers
Converters
Electric potential
Energy conversion
Energy conversion efficiency
Energy storage
Generators
grid-side converter
internal model control
Linear control
Nonlinear control
Power flow
Sliding mode control
Voltage
wind energy conversion system
Wind power
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Summary:In this paper, we propose a comparative study of linear and nonlinear algorithms designed for grid-side control of the power flow in a wind energy conversion system. We performed several simulations and experiments with step and variable power scenarios for different values of the DC-link capacity with the DC storage element being the key element of the grid-side converter. The linear control was designed on the basis of the internal model control theory where an active damping was added to avoid steady state errors. Nonlinear controls were built using first and second order sliding mode controls with theoretical considerations to ensure accuracy and stability. We observed that the first order sliding mode control was the most efficient algorithm for controlling the DC-link voltage but that the chattering degraded the quality of the energy injected into the grid as well as the efficiency of the grid-side converter. The linear control caused overshoots on the DC-link voltage; however, this algorithm had better performance on the grid side due to its smoother control. Finally, the second order sliding mode control did not prove to be more robust than the other two algorithms. This can be explained by the fact that this control is theoretically more sensitive to converter losses.
ISSN:1996-1073
1996-1073
DOI:10.3390/en14134049