Abstract
In order to improve the power quality of DFIG power generation, this paper proposes a variable switching frequency pulse width modulation (VSFPWM) strategy for grid-side three-level neutral-point clamped (NPC) converter for doubly-fed induction generator (DFIG) wind turbine. For different voltage vectors, different Thevenin equivalent circuits are used to derive the analytical expressions of the grid-side converter current ripple, and the current ripple slope and effective time of each cycle can be obtained. The VSFPWM strategy takes the peak-to-peak value of the three-phase output current ripple as a constraint, updates the switching frequency in each interruption cycle, and limits the current ripple as the constraint to limit the current ripple to a certain range. The switching frequency is updated in each interrupt cycle to reduce the equivalent switching frequency and electromagnetic interference (EMI) noise. Finally, the simulation results validate the effectiveness of the proposed control strategy.
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