In this paper, an enneagon multi-level converter (E-MMC) is proposed, which can directly connect six-phase wind power generator to AC grid. It has the advantages of high efficiency, small fluctuation of capacitor voltage of sub-modules (SMs), and no need of step-up transformer. The working principle of the converter is analyzed, and the optimal phase shifting angle between the two windings of the six-phase wind turbine is determined under different boost ratios. The voltage stability control strategy of the converter and the current tracking control strategy based on proportional resonance (PR) are proposed. The simulation and experiment verify the effectiveness of the proposed system and its control strategy from both steady and transient aspects.
|Journal||International Journal of Electrical Power and Energy Systems|
|Number of pages||8|
|Publication status||Published - 2020|
Zhou, S., Rong, F., Sun, W., Huang, S., & Wu, Q. (2020). AC/AC grid connection of six-phase wind power generator based on enneagon MMC converter. International Journal of Electrical Power and Energy Systems, 118, . https://doi.org/10.1016/j.ijepes.2019.105810