Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 32, Issue 6, Pages 4619-4630Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2016.2598286
Keywords
Capacitor voltage ripple; common-mode voltage; hybrid topology; low motor speed; modular multilevel converter (MMC); motor startup; soft switching; variable-speed drives
Categories
Funding
- National Natural Science Foundation of China [51237002, 51477034]
- China Scholarship Council
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Modular multilevel converters (MMC) have revolutionized the voltage-sourced converter-based high-voltage direct current transmission, but not yet got widespread application in medium-voltage variable-speed motor drives, because of the large capacitor voltage ripples at lowmotor speeds. In this paper, a novel hybrid MMC topology is introduced, which significantly reduces the voltage ripple of capacitors, particularly at low motor speeds. Moreover, this topology does not introduce any motor common-mode voltage; as a result, there are no insulation and bearing current problems. Additionally, the current stress can remain at rated value throughout the whole speed range; thus, no device needs to be oversized and converter efficiency can be ensured. Operating principle of this hybrid topology is explained, and control schemes are also developed. Validity and performance of the proposed topology are verified by simulation and experimental results.
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