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A Modular Coupled Inductor-Based Regenerative Cascaded Multicell Converter for Medium Voltage Drive
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DOI：10.1109/tie.2026.3677612.png)
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Abstract
En 中文
Cascaded multicell converter (CMC) is proved to be an effective solution for medium-voltage (MV) high-power variable-speed drives. To enable this converter with regeneration capability, the diode bridge rectifier is replaced by an active front-end rectifier (AFER) in each cell. However, this configuration requires large filter inductors and overrated transformers due to switching harmonics, produced by AFER. This article proposes a coupled-inductor-based modular regenerative CMC employing three-phase AFER cells. The modular design enhances scalability, while the coupled inductor (CI) effectively attenuates switching harmonics, thereby reducing transformer volt-ampere (VA) rating. In addition, the CI ensures equal current sharing among cells, reducing both control complexity and the number of current sensors required. The three-phase AFER eliminates subharmonic currents in motor and grid currents and reduces the DC-link capacitor requirement of each cell. The proposed topology is experimentally validated on a developed laboratory prototype, and the results confirm the effectiveness of the converter.
Keywords:
Cascaded multicell converter (CMC)
coupled inductor (CI)
high power drive
regenerative braking
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7.2
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1.8W
Citations:
9.8W
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