Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 33, Issue 2, Pages 1211-1224Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2017.2677527
Keywords
Distorted grid voltage; doubly fed induction generator (DFIG); feed-forward regulator; stator harmonic currents suppression
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Funding
- National Natural Science Foundation of China [51622706]
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This paper presents a stator harmonic currents suppression method for doubly fed induction generators (DFIGs) under distorted grid voltage. In the proposed control strategy, the feed-forward regulator instead of the resonant regulator is employed to eliminate the negative impacts on the stator current caused by the distorted grid voltage. The leading phase compensator is applied to compensate the system delay when the sampling frequency is low. This approach can provide both the good dynamic response and strong rejection ability against the stator harmonic voltages. Based on the stator current model of DFIG, the feed-forward regulator is designed in detail. The comparison between the resonant controllers and the feed-forward regulator is also made on the basis of Bode diagram. Then, the robustness against the frequency variations and the parameter deviations is analyzed. Finally, the simulation and experimental results are presented to validate the effectiveness of the proposed control strategy.
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