DC Voltage Compensation Strategy for Parallel Hybrid Multilevel Voltage-Source Converter


The hybrid multilevel voltage-source converter, combining semiconductor switches and power module cells, is a new family for VSC-HVDC applications. The hybrid multilevel converter in parallel arrangement (PHMC), in terms of converter investment, is very adaptable for cable transmission systems. But, the dc voltage of the converter, synthesized by the output voltage of three-part cell stacks, is strongly including ac voltage variations, that influences the soundness of converter operation. This paper proposes a dc voltage compensation strategy for the parallel hybrid multilevel converter. This strategy, implemented by introducing an isolation amount, can effectively cope with the dc voltage deviation, especially underneath ac network faults. Simulation ends up in PSCAD/EMTDC verify the effectiveness of the proposed strategy under various circumstances.

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