Abstract
The modular multilevel converter (MMC) is attractive for medium- or high-power applications because of its high modularity, availability, and high power quality. In this article, the dc-link current ripple of the three-phase MMC derived from the phase-disposition pulsewidth modulation and circulating current control is analyzed. A variable carrier phase-shifted angle control strategy under the two-group carriers-based modulation is proposed to suppress the dc-link current ripple of the three-phase MMC. Through the regulation of the carrier phase-shifted angles under the two-group carriers-based modulation in each carrier period, the high-frequency current injected into the dc link from the three phases of the MMC can be counteracted, which suppresses the dc-link current ripple of the MMC with simple algorithm, and therefore improves the dc-link power quality. Simulations and experimental studies of the MMC are conducted, and the results confirm the effectiveness of the proposed control strategy for the MMC.
| Original language | English |
|---|---|
| Article number | 8786169 |
| Pages (from-to) | 3310-3324 |
| Number of pages | 15 |
| Journal | IEEE Transactions on Power Electronics |
| Volume | 35 |
| Issue number | 3 |
| DOIs | |
| State | Published - Mar 2020 |
| Externally published | Yes |
Keywords
- Control strategy
- dc-link current
- modular multilevel converters (MMCs)
- pulsewidth modulation (PWM)
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