TY - GEN
T1 - A modular multilevel converter with isolated energy-balancing modules for MV drives incorporating symmetrical six-phase machines
AU - Diab, Mohamed S.
AU - Williams, B. W.
AU - Holliday, Derrick
AU - Massoud, Ahmed M.
AU - Ahmed, Shehab
PY - 2017/11/3
Y1 - 2017/11/3
N2 - A modular multilevel converter (MMC) configuration is presented as a medium-voltage high-power drive for variablespeed applications incorporating symmetrical six-phase machines. The topology employs six standard MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of ripple-power decoupling between adjacent sub-modules (SMs) of MMC phaselegs, while feeding machine windings in a spatial phase-opposition fashion, is realized through isolated DC-DC converter modules. This concept offers a significant reduction in SM capacitance, while eliminating the problem of SM capacitor wide voltage fluctuations, especially at low operating frequencies. Furthermore, the proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed up to the rated speed is possible under rated torque operating conditions. The proposed MMC configuration is analyzed in detail, and its performance is validated using both simulation and experimentation.
AB - A modular multilevel converter (MMC) configuration is presented as a medium-voltage high-power drive for variablespeed applications incorporating symmetrical six-phase machines. The topology employs six standard MMC phase-legs feeding two isolated groups of three-phase machine windings, each with 60° spatial phase-displacement. A novel concept of ripple-power decoupling between adjacent sub-modules (SMs) of MMC phaselegs, while feeding machine windings in a spatial phase-opposition fashion, is realized through isolated DC-DC converter modules. This concept offers a significant reduction in SM capacitance, while eliminating the problem of SM capacitor wide voltage fluctuations, especially at low operating frequencies. Furthermore, the proposed configuration can efficiently operate at near zero frequency, therefore a machine speed-range from zero speed up to the rated speed is possible under rated torque operating conditions. The proposed MMC configuration is analyzed in detail, and its performance is validated using both simulation and experimentation.
KW - Dual half-bridge (DHB)
KW - Medium-voltage variable-speed drives
KW - Modular multilevel converter (MMC)
KW - Power decoupling
KW - Sub-module (SM) capacitor voltage-ripple
KW - Symmetrical six-phase machines
UR - http://www.scopus.com/inward/record.url?scp=85041433923&partnerID=8YFLogxK
U2 - 10.1109/ECCE.2017.8096509
DO - 10.1109/ECCE.2017.8096509
M3 - Conference Contribution (Conference Proceeding)
AN - SCOPUS:85041433923
T3 - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
SP - 2715
EP - 2722
BT - 2017 IEEE Energy Conversion Congress and Exposition, ECCE 2017
PB - Institute of Electrical and Electronics Engineers (IEEE)
T2 - 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Y2 - 1 October 2017 through 5 October 2017
ER -