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This paper presents a dual Modular Multilevel
Converter (MMC) topology that utilizes energy exchange between adjacent arm
Sub-Modules (SM), operating with out-of-phase modulation. The proposed
configuration is applicable to medium-voltage, high-power variable-speed drives
incorporating open-end stator winding machines. A novel concept of power
redistribution between adjacent SMs in the dual MMC topology is realized
through high-frequency transformer-based dc-dc converter modules. This concept
offers a significant reduction in the sizing requirement of the SM capacitance
and the stored energy in the MMC system, while avoiding the problem of wide
voltage fluctuations of SM capacitors, especially at low operating frequencies.
The proposed configuration can produce dc voltage; therefore, a machine
speed-range from zero speed to the rated speed is possible under the rated
torque operating condition. The operating principles of the proposed dual MMC
configuration are elaborated and necessary mathematical analysis is derived.
Simulation and experimental results verify the concept of the proposed drive
configuration.
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