Abstract
A topology for six series-connected single-phase modular multilevel converters (MMCs) for multi-phase permanent-magnet synchronous generator (PMSG) wind power systems is proposed to deliver wind power to a medium-voltage DC (MVDC) grid. The AC side of each MMC is connected to one phase of the multi-phase PMSG. The DC sides of the MMCs are connected in series to obtain a medium-level DC voltage. The maximum power point tracking (MPPT) and grid-connected control methods are discussed in detail. The high-frequency voltage injection circuit is designed to suppress the voltage fluctuations of the sub-module capacitor. Further, the nearest-level and pulse width modulation (NL-PWM) based on the sampling value is proposed to suppress the harmonics of the stator current. The proposed topology exhibits low costs, a high efficiency, and a high boost ratio without an additional step-up DC/DC converter or transformer. The constructed simulation model verifies the validity of the proposed topology. Moreover, the experimental results are assessed with RT-Lab.
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