Voltage-Balancing Method for Modular Multilevel Converters Under Phase-Shifted Carrier-Based Pulsewidth Modulation


The modular multilevel converter (MMC) becomes attractive for medium- or high-power applications because of the advantages of high modularity, availability, and power quality. One amongst the technical challenges related to an MMC is that the balancing of the capacitors' voltages. During this paper, a voltage-balancing management method is proposed for the MMC beneath phase-shifted carrier-based mostly pulsewidth modulation. The proposed voltage-balancing method uses the linearization technique for pulse sorting while not arm current measurement, that will management the capacitor charge transfer to balance the capacitor voltage in the MMC. In the proposed methodology, the voltagebalancing algorithm is implemented in every carrier wave amount, that reduces the computational intensity and burden. Furthermore, the arm current can conjointly be improved with the proposed method. The simulation studies with the professional tool PSCAD/EMTDC are conducted, and a downscale MMC prototype is additionally tested with the proposed methodology. The study results show the effectiveness of the proposed voltage-balancing method.

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