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This paper focuses on the operation of a grid-connected modular multilevel converter (MMC) supplying a pulsed dc load. The goal is to achieve minimum ac power fluctuation despite the high power fluctuation present on the dc side. The MMC has been selected for its inherent ability to decouple ac and dc current controllers. However, if no additional provisions are taken, the pulsed load causes imbalance...
This paper focuses on a Modular Multilevel Converter grid interface for a klystron modulator system that behaves as a pulsed DC load. With such a load, and without mitigating control, the MMC suffers from cell capacitor voltage imbalance between the converter arms which leads to distortion (fluctuation) of the absorbed AC power. This paper proposes an augmented modulation strategy, with a tailored...
This paper analyses the behaviour of grid connected modular multilevel converter, under pulsed load at the DC side. The goal is to achieve minimum AC power fluctuation despite high power fluctuation on the DC side. Pulsed load causes imbalances of cell capacitor voltages, and this effect is analytically described. The control methodology, together with an algorithm for capacitor voltage balancing...
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