Multi-tasking dc-dc and dc-ac converters for dc voltage tapping and power control in highly meshed multi-terminal HVDC networks

Adam, Grain Philip and Abdelsalam, Ibrahim and Xu, Lie and Fletcher, John and Burt, Graeme and Williams, Barry (2017) Multi-tasking dc-dc and dc-ac converters for dc voltage tapping and power control in highly meshed multi-terminal HVDC networks. IET Power Electronics. ISSN 1755-4535

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    Abstract

    this paper extends a recently proposed dc auto-transformer to a true multi-port converter that can function simultaneously as dc auto-transformer and a dc/ac converter for dc voltage matching and tapping, and power control in highly meshed multi-terminal dc grids. The presented multi-port converter can generate multiple adjustable dc voltages from a fixed or variable input dc voltage, or from an active ac grid. Theoretical discussions and simulations indicate that when the proposed multi-port converter is used as a hybrid dc and ac hub to manage congestions and resolve loop flow issues in a highly meshed multi-terminal dc network, large dc power can be fed to the lower dc terminal, without exposing the switching devices of the lower sub-converter to excessive current stress. Its increased control flexibility and response to dc faults at high and low dc terminals are validated using simulations and experiments.

    ORCID iDs

    Adam, Grain Philip ORCID logoORCID: https://orcid.org/0000-0002-1263-9771, Abdelsalam, Ibrahim, Xu, Lie ORCID logoORCID: https://orcid.org/0000-0001-5633-7866, Fletcher, John, Burt, Graeme ORCID logoORCID: https://orcid.org/0000-0002-0315-5919 and Williams, Barry;