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In low-voltage ride-through or unbalance gird voltage condition, the fundamental fluctuation in the neutral-point (NP) voltage of three-level voltage source converter will appear under imbalanced grid voltage situation and has not been researched in detail. A new NP current model under imbalanced grid is developed to investigate the limitations of conventional nearest-vector modulation and to give...
Effects of lower order harmonic grid voltage on the stator current of the Doubly Fed Induction Generator (DFIG) are investigated. A stator harmonic current control method for DFIG wind power system is presented to suppress the effects of the lower order harmonic grid voltage on the stator current. The proposed control scheme is analyzed using transfer function. The performance of the proposed control...
Voltage harmonics in the grid can introduce stator current harmonics in a doubly fed induction generator (DFIG) wind turbine system, which may potentially impact the generated power quality. Therefore, wind turbine current controllers need to be designed to eliminate the impact of grid voltage harmonics, especially low-order harmonics. This paper proposes a stator current harmonic suppression method...
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