Abstract
Since its emergence in 2002, the modular multilevel converter (MMC) has been extensively addressed as a promising candidate for medium-voltage machine drives. However, the MMC application as a variable-speed drive experiences a serious challenge pertinent to its unique operating principles, resulting in wide voltage fluctuations across the MMC floating capacitors inversely proportional to the operating frequency. The high-frequency circulating current injection is the mainstream approach to suppress the capacitor voltage ripple at lower operating frequencies, however at the expense of introducing high-frequency common-mode voltage at the machine terminals. This paper adopts the high-frequency circulating current injection approach in a dual MMC topology applicable to open-winding machine drives, with the advantage of mitigating the high-frequency common-mode voltage at the machine terminals by exploiting an inherent feature in open-winding configurations. The theoretical analysis of common-mode voltage mitigation is presented in this paper supported with verification results based on MATLAB simulation.
Original language | English |
---|---|
DOIs | |
Publication status | Published - 30 Oct 2020 |
Event | Energy Conversion Congress and Exposition - Detroit, MI, USA, United States Duration: 11 Oct 2020 → 15 Oct 2020 https://www.ieee-ecce.org/2020/ |
Conference
Conference | Energy Conversion Congress and Exposition |
---|---|
Abbreviated title | ECCE 2020 |
Country/Territory | United States |
Period | 11/10/20 → 15/10/20 |
Internet address |
Keywords
- Capacitor voltage ripple
- common-mode voltage
- high-frequency injection
- medium-voltage (MV) drives
- modular multilevel converter (MMC)
- open-winding machines
- variable-speed drives