Common-Mode Voltage Injection Techniques for Quasi Two-Level PWM-Operated Modular Multilevel Converters

This paper studies the application of the common-mode voltage injection techniques known from two-level inverters (carrier-based space-vector modulation and flat-top modulation in particular) to quasi two-level PWM-operated modular multilevel converters. Similar to two-level inverters, the available operating area is extended to higher modulation indices. The properties of the respective techniques are compared to each other and to the modular multilevel converter in normal operation mode. The results are based on simulations and the model is partly experimentally validated on a down-scaled converter prototype.

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