Investigation of a 5-port LCL DC hub connecting 7 HVDC terminals in the North of Scotland

A. Jamshidi Far, M. Hajian Foroushani, D. Jovcic, Y. Audichya

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Reliable and cost effective power transmission from North of Scotland offshore wind farms towards Scotland, England and Norway using a 7-terminal MMC DC grid is studied. The proposed DC grid employs a 5-port inductor-capacitorinductor (LCL) fault tolerant MMC DC hub which interconnects several HVDC cables. The hub achieves power flow control between different terminals, DC voltage stepping using no internal AC transformer, and most importantly it enables DC fault isolation from each port. The faulty port is isolated form the healthy ports of the system using internal AC circuit breakers if the fault is persistent. Advanced control architecture is proposed for all MMC terminals and DC hub MMC VSCs to guarantee stable grid behaviour in normal operation and during severe DC faults. The whole system is modelled in PSCAD and simulation results are presented to confirm acceptable performance of the proposed DC grid.

Original languageEnglish
Title of host publication13th IET International Conference on AC and DC Power Transmission (ACDC 2017)
PublisherInstitution of Engineering and Technology
Volume2017
EditionCP709
DOIs
Publication statusPublished - 2017
Event13th IET International Conference on AC and DC Power Transmission, ACDC 2017 - Manchester, United Kingdom
Duration: 14 Feb 201716 Feb 2017

Conference

Conference13th IET International Conference on AC and DC Power Transmission, ACDC 2017
CountryUnited Kingdom
CityManchester
Period14/02/1716/02/17

Keywords

  • DC grid
  • LCL DC hub
  • MMC
  • Offshore grids

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