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

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Bibliographic Details
Title: Multi-tasking dc–dc and dc–ac converters for dc voltage tapping and power control in highly meshed multi-terminal HVDC networks.
Authors: Adam, Grain Philip1 grain.adam@eee.strath.ac.uk, Abdelsalam, Ibrahim2, Lie Xu1, Fletcher, John3, Burt, Graeme1, Williams, Barry1
Source: IET Power Electronics (Wiley-Blackwell). 2017, Vol. 10 Issue 15, p2217-2228. 12p. 2 Diagrams, 1 Chart, 9 Graphs.
Subjects: High-voltage direct current transmission, Voltage control, Computer multitasking, Electric current converters, Electric power transmission
Abstract: This study 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 subconverter 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. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:This study 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 subconverter 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. [ABSTRACT FROM AUTHOR]
ISSN:17554535
DOI:10.1049/iet-pel.2016.1035