PROJECT TITLE :
Application of an Advanced Repetitive Controller to Mitigate Harmonics in MMC With APOD Scheme
During a modular multilevel converter (MMC), the second and other even-order harmonics within the circulating currents are mainly due to the fluctuations within the capacitor voltages within the sub modules of the MMC. The increased circulating currents have an effect on the system performance and threatens the safety operation of power devices. To mitigate the circulating currents, this article puts forward the applying of a sophisticated repetitive controller with alternate phase opposition and disposition pulse-width modulation technique. The proposed controller was operated in tandem with a proportional integral controller for higher results of circulating current harmonic suppression and then the stability analysis was analyzed by the Popov criteria. This methodology is terribly simple to implement and suitable for multiple harmonic mitigation. Pc simulations and experimental results on a prototype shows that the proposed controller is effective and simple to implement for MMCs.
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