Journal article
Advanced Control Strategy of DFIG Wind Turbines for Power System Fault Ride Through
This paper presents an advanced control strategy for the rotor and grid side converters of the doubly fed induction generator (DFIG) based wind turbine (WT) to enhance the low-voltage ride-through (LVRT) capability according to the grid connection requirement. Within the new control strategy, the rotor side controller can convert the imbalanced power into the kinetic energy of the WT by increasing its rotor speed, when a low voltage due to a grid fault occurs at, e.g., the point of common coupling (PCC).
The proposed grid side control scheme introduces a compensation term reflecting the instantaneous DC-link current of the rotor side converter in order to smooth the DC-link voltage fluctuations during the grid fault. A major difference from other methods is that the proposed control strategy can absorb the additional kinetic energy during the fault conditions, and significantly reduce the oscillations in the stator and rotor currents and the DC bus voltage.
The effectiveness of the proposed control strategy has been demonstrated through various simulation cases. Compared with conventional crowbar protection, the proposed control method can not only improve the LVRT capability of the DFIG WT, but also help maintaining continuous active and reactive power control of the DFIG during the grid faults.
Language: | English |
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Publisher: | IEEE |
Year: | 2012 |
Pages: | 713-722 |
ISSN: | 08858950 and 15580679 |
Types: | Journal article |
DOI: | 10.1109/TPWRS.2011.2174387 |
ORCIDs: | Ostergaard, Jacob |
Doubly fed induction generator (DFIG) Low Voltage Ride Through Power system fault Wind turbine
Circuit faults DC bus voltage DC-link current DC-link voltage fluctuations DFIG WT Generators LVRT enhancement PCC Rotors Stators Voltage control Wind speed Wind turbines advanced control strategy asynchronous generators crowbar protection doubly fed induction generator wind turbine grid side control scheme grid side converters low voltage ride through low-voltage ride-through enhancement machine control oscillation reduction point of common coupling power convertors power generation control power generation faults power grids power system fault power system fault ride through reactive power control rotor side converters wind turbine wind turbines