Abstract
Low-speed drive is one of the challenges for modular multilevel converters (MMCs) due to large capacitor voltage fluctuation. In this paper, a cascaded MMC and cycloconverter (CCV) based machine drive system is proposed to ensure stable operation of medium- -voltage and low-speed machine. The MMC provides medium-frequency ac voltage for the CCV, and the CCV converts the medium-frequency ac input to low-frequency ac output required by the machine. Detailed analysis about MMCs operation frequency, device current stress and submodule (SM) capacitance are given in this paper. Proposed drive system can operate at zero/low frequency under rated load torque, while the SM capacitance is much smaller than that in existing methods. Simulation and experimental studies are conducted, and the results verify the effectiveness of proposed system.
| Original language | English |
|---|---|
| Number of pages | 11 |
| Journal | IEEE Transactions on Industrial Electronics |
| DOIs | |
| Publication status | E-pub ahead of print - 29 Apr 2022 |
Bibliographical note
(c) 2021 IEEE. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for detailsKeywords
- Capacitance
- Capacitor voltage
- Capacitors
- cycloconverter
- Fluctuations
- low-speed machine drive
- modular multilevel converter (MMC)
- Stress
- Thyristors
- Voltage control
- Voltage fluctuations