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MMC Stored Energy Participation to the DC Bus Voltage Control in an HVDC Link

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Samimi, Shabab | Gruson, François | Delarue, Philippe | Colas, Frédéric | Belhaouane, Mohamed Moez | Guillaud, Xavier

Edité par HAL CCSD ; Institute of Electrical and Electronics Engineers

International audience. The modular multilevel converter (MMC) is becoming a promising converter technology for HVDC transmission systems. Contrary to the conventional two- or three-level VSC-HVDC links, no capacitors are connected directly on the dc bus in an MMC-HVDC link. Therefore, in such an HVDC link, the dc bus voltage may be much more volatile than in a conventional VSC-HVDC link. In this paper, a connection between the dc bus voltage level and the stored energy inside the MMC is proposed in order to greatly improve the dynamic behavior in case of transients. EMT simulation results illustrate this interesting property on an HVDC link study case.

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