Modelling and Validation of a Grid-Connected DFIG by Exploiting the Frequency-Domain Harmonic Analysis

Wind Energy Conversion Systems (WECS) based on a Doubly-Fed Induction Generator (DFIG) represent the most common configuration employed in wind turbines. These systems involve injecting harmonic currents toward an electrical grid from a back-to-back power converter, potentially creating voltage dist...

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Bibliographic Details
Published in:Applied sciences 2020-12, Vol.10 (24), p.9014
Main Authors: Hernández-Mayoral, Emmanuel, Iracheta-Cortez, Reynaldo, Lecheppe, Vincent, Salgado, Oscar Alfredo Jaramillo
Format: Article
Language:English
Subjects:
Alternative energy sources
back-to-back power converter
Doubly-Fed Induction Generator (DFIG)
Electric power
Energy conversion
Engineering Sciences
Fourier analysis
Frequency analysis
Harmonic analysis
Induction generators
Industrial plant emissions
load flow calculation
Magnetic fields
Modelling
Power converters
Pulse duration modulation
Renewable resources
Resonant frequencies
steady-state studies
Turbines
Velocity
Voltage
Voltage distortion
Wind power
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Summary:Wind Energy Conversion Systems (WECS) based on a Doubly-Fed Induction Generator (DFIG) represent the most common configuration employed in wind turbines. These systems involve injecting harmonic currents toward an electrical grid from a back-to-back power converter, potentially creating voltage distortions. To assess this phenomenon, a case study of a 3 kW DFIG-based wind turbine connected to the electrical grid is presented for analysis in the harmonic domain. Initially, a DFIG-based load flow analysis for determining the operating conditions is tackled at the fundamental frequency. Then, the modelling of a DFIG under steady-state operating conditions at harmonic frequencies is analyzed discussing its characteristics in the harmonic domain. The high-frequency harmonics in the output voltage of a pulse width modulation-driven inverter feeding the rotor windings of a DFIG and its connection to a three-winding transformer are also analyzed. This investigation produced a complete model of the DFIG connected to the electrical grid. The results demonstrated that although a considerable harmonic contribution up to the 25th order exists, it remains harmless since it is below 5%, according to the Std. IEEE 519.
ISSN:2076-3417
2076-3417
DOI:10.3390/app10249014