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 language | English |
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Title of host publication | 13th IET International Conference on AC and DC Power Transmission (ACDC 2017) |
Publisher | Institution of Engineering and Technology |
Volume | 2017 |
Edition | CP709 |
DOIs | |
Publication status | Published - 2017 |
Event | 13th IET International Conference on AC and DC Power Transmission, ACDC 2017 - Manchester, United Kingdom Duration: 14 Feb 2017 → 16 Feb 2017 |
Conference
Conference | 13th IET International Conference on AC and DC Power Transmission, ACDC 2017 |
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Country/Territory | United Kingdom |
City | Manchester |
Period | 14/02/17 → 16/02/17 |
Keywords
- DC grid
- LCL DC hub
- MMC
- Offshore grids