Journal
APPLIED SCIENCES-BASEL
Volume 9, Issue 6, Pages -Publisher
MDPI
DOI: 10.3390/app9061124
Keywords
double fed induction generator; unbalanced and harmonic grid voltage; multi-resonant-based sliding mode control; power quality
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Funding
- Zhejiang Provincial Natural Science Foundation of China [LQ18E070001]
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In general, the integral sliding mode control (ISMC) with an integral sliding surface would lead to tracking errors under unbalanced and harmonic grid voltage conditions. In order to eliminate tracking errors under these conditions, multi-resonant items are added to the conventional integral sliding surface in the proposed strategy, which can be called multi-resonant-based sliding mode control (MRSMC). A comparison of tracking precision on the ISMC and MRSMC is analyzed. In order to regulate the system powers directly, the errors of instantaneous active and reactive powers are selected as the state variables. Finally, the output current harmonics and a majority of the doubly-fed induction generator's (DFIG) electromagnetic torque pulsations can be removed under unbalanced and harmonic grid voltage conditions. Simulation and experimental results are presented to verify the correctness and effectiveness of the proposed strategy.
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