Abstract
The requirement of a large number of sizeable capacitors in traditional modular multilevel converter (MMC) submodules is seen as a major barrier hampering its widespread use in medium-voltage applications. To reduce the value of capacitance, this paper presents a modified MMC (M-MMC) topology, which offers inherent alleviated capacitor voltage fluctuations compared with traditional MMC. Its operating principle, modulation, and capacitor voltage balancing strategies are described in detail. Moreover, a novel capacitor voltage fluctuation suppression scheme is also proposed to further reduce the second-order capacitor voltage ripples. Finally, both a three-phase prototype of M-MMC and traditional MMC have been built in the laboratory. The effectiveness of the proposed M-MMC topology and control methods is experimentally verified by comparing with the traditional MMC.
| Original language | English |
|---|---|
| Article number | 7088606 |
| Journal | IEEE Transactions on Industrial Electronics |
| Volume | 62 |
| Issue number | 10 |
| Pages (from-to) | 6108-6119 |
| Number of pages | 12 |
| ISSN | 0278-0046 |
| DOIs | |
| Publication status | Published - 1 Oct 2015 |
Bibliographical note
Publisher Copyright:© 2015 IEEE.
Keywords
- Capacitor voltage fluctuation
- medium voltage drive
- modular multilevel converter (MMC)
- voltage balancing