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The required module capacitances of modular multilevel converters can be significantly reduced in comparison to conventional operation modes when quasi-two-level operation is applied. Unfortunately, the output voltage distortion becomes similar to those of conventional two-level-converters. Adding a new current path to the topology enables quasi-three-level operation of the modular multilevel converter, which can reduce the harmonic content of the output voltage while still maintaining the advantage of small module capacitances. In this paper, a novel converter topology based on a combination of modular multilevel converter and bidirectional semiconductor clamping switch is presented, which is capable of quasi-three-level operation. This novel topology has all advantages of a quasi-three-level modular multilevel converter topology from literature, while overcoming the requirement for additional full-bridge modules connected between the phase output and the dc center tap. This is expected to reduce costs and losses.
Drazen Dujic, Andrea Cervone, Tianyu Wei
Drazen Dujic, Chengmin Li, Jing Sheng, Xin Xiang