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The branch paralleling represents one of the available options with regards to the modular multilevel converter power extension. In such a case, the main technical challenge resides in the control domain, whereas a new set of possibilities from the voltage modulation standpoint becomes available along the way. This paper provides a thorough mathematicalanalysis of the modular multilevel converter operating with parallel branches and utilizing phase-shifted carrier modulation to synthesize the desired voltage references. The influence of the adjacent branches’ carriers shift on the voltages across the terminals of the converter leg is presented in a comprehensive manner. Detailed simulations confirm the derived mathematical predictions and allow for the performance guided choice of relevant modulator parameters.
Tobias Kippenberg, Maxim Karpov, Martin Hubert Peter Pfeiffer, Arne Kordts, Fatemeh Alishahi, Ahmad Fallahpour, Cong Liu
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