Power balancing and dc fault ride through in DC grids with dc hubs and wind farms

Acknowledgment This project was funded by European Research Council under the Ideas program in FP7; grant no 259328, 2010.Peer reviewedPostprin

Dual Channel Control with DC Fault Ride Through for MMC-based, Isolated DC/DC Converter

This study is sponsored by the Engineering and Physical Sciences Research Council (EPSRC) grant no EP/K006428/1, 2013.D. Jovcic and H. Zhang are with the School of Engineering, University of Aberdeen, AB24 3UE, U.K. ([email protected], [email protected]).Peer reviewedPostprin

Series LC DC Circuit Breaker

This work was supported by the Europend Udiod’s Horizon 2020 research and innovation program under grant No. 691714. The author is thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studiesPeer reviewedPublisher PD

Fast Commutation of DC Current into a Capacitor Using Moving Contacts

The author is thankful to Mr R. Osborne from University of Aberdeen for help with the experimental studies.Peer reviewedPostprin

LC DC Circuit Breaker based on Precharged Capacitor Commutation

Acknowledgment This project is funded by SFC COVID 19 grant. The author is thankful to Mr Richard Osborne, technician from University of Aberdeen for the experimental studies.Peer reviewedPostprin

Control of HVDC systems operating with long DC cables

Postprin

Modular multilevel converter based LCL DC/DC converter for high power DC transmission grids

This paper presents a modular multilevel converter (MMC) based DC/DC converter with LCL inner circuit for HVDC transmission and DC grids. Three main design challenges are addressed. The first challenge is the use of MMCs with higher operating frequency compared to common transformer-based DC/DC converters where MMC operating frequency is limited to a few hundred hertz due to core losses. The second issue is the DC fault response. With the LCL circuit, the steady state fault current is limited to a low magnitude which is tolerable by MMC semiconductors. Mechanical DC circuit breakers can therefore be used to interrupt fault current for permanent faults and extra sub-module bypass thyristors are not necessary to protect antiparallel diodes. Thirdly, a novel controller structure is introduced with multiple coordinate frames ensuring zero local reactive power at both bridges in the whole load range. The proposed controller structure is also expandable to a DC hub with multiple ports. Detailed simulations using PSCAD/EMTDC are performed to verify the aforementioned design solutions in normal and fault conditions

Small-Signal Dynamic DQ Model of Modular Multilevel Converter for System Studies

This work was funded by the European Research Council under the Ideas program in FP7 under Grant 259328, 2010. Paper no. TPWRD-00046-2015.Peer reviewedPostprin

Full Bridge MMC Converter Optimal Design to HVDC Operational Requirements

This project is funded by RTE, Paris, FrancePeer reviewedPostprin

Experimental Evaluation of 5 kV, 2 kA, DC Circuit Breaker with Parallel Capacitor

The authors are thankful to University of Aberdeen technicians: Mr R. Osborne and I. Young for help with the experimental studies.Peer reviewedPostprin