Abstract
The modular multilevel converter (MMC) is one of the most promising converter topologies for medium/high power applications. The upper and lower arm parameters of MMC have some differences inevitably in the practical projects. Under this asymmetric arm parameter conditions, the dc current and the double-frequency current will flow into the ac side, the fundamental-frequency circulating current will flow into the dc side, and capacitor voltage imbalance will occur among different arms. To solve these problems, the decoupled control model of MMC under the asymmetric conditions is established, then the arm current direct control strategy is proposed to improve the performance of the current control of MMC under asymmetric conditions. Meanwhile, based on the energy model of the cascaded sub-modules, an optimized control method of arm capacitor voltage is proposed, which can keep the terminal behavior of MMC unaffected by the circulating current. Finally, experimental results verify the effectiveness of the theoretical analysis and the proposed control strategy.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
