Coupling DFIG-Based Wind Turbines with the Grid under Voltage Imbalance Conditions

A smooth coupling is implemented between the grid and doubly fed induction generator-based wind turbines (DFIG-WTs) during grid voltage imbalance. The nonlinear characteristics of a grid-connected DFIG-WT system may increase stresses on the mechanical and electrical components of wind turbines. Such...

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Bibliographic Details
Published inSustainability Vol. 14; no. 9; p. 5076
Main Authors Sobhy, Ahmed, Abo-Khalil, Ahmed G., Lei, Dong, Salameh, Tareq, Merabet, Adel, Alkasrawi, Malek
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2022
Subjects
Alternative energy sources
Controllers
Electric components
Electric potential
Electromagnetic fields
Energy industry
Energy resources
Fossil fuels
Induction generators
Robust control
Rotors
Stators
Sustainability
Synchronism
Synchronization
Turbines
Voltage
Wind power
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Summary:A smooth coupling is implemented between the grid and doubly fed induction generator-based wind turbines (DFIG-WTs) during grid voltage imbalance. The nonlinear characteristics of a grid-connected DFIG-WT system may increase stresses on the mechanical and electrical components of wind turbines. Such difficulties are greatly increased during periods of voltage imbalance. Consequently, in this paper, a new control scheme is proposed to regulate DFIGs in order to support a smooth connection to the grid during voltage imbalance. In synchronization mode, the positive sequence of the rotor dq-axes currents regulates the stator q-axis EMF that is to be synchronized with the q-axis voltage of the grid-side voltage. The phase difference between the grid and stator voltages is compensated by adjusting the stator d-axis EMF to zero. Under normal conditions, a PR controller is used to dampen the negative sequence of the rotor dq-axes currents. PI current controllers are tuned to control the positive sequence of the DFIG rotor currents, while PR current controllers are used to regulate the negative sequence of the rotor currents during synchronization and under normal operation conditions. Experiments are performed to verify the smooth synchronization of the DFIG and the robustness of the proposed control scheme during grid voltage imbalance.
ISSN:2071-1050
2071-1050
DOI:10.3390/su14095076