Browsing by Keyword "HVDC transmission"
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Item Cascaded- and Modular-Multilevel Converter Laboratory Test System Options: A Review: A Review(2021-03) Heath, Theodor; Barnes, Mike; Judge, Paul D.; Chaffey, Geraint; Clemow, Phil; Green, Tim C.; Green, Peter R.; Wylie, James; Konstantinou, Georgios; Ceballos, Salvador; Pou, Josep; Belhaouane, Mohamed Moez; Zhang, Haibo; Guillaud, Xavier; Andrews, Jack; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe increasing importance of cascaded multilevel converters (CMCs), and the sub-category of modular multilevel converters (MMCs), is illustrated by their wide use in high voltage DC connections and in static compensators. Research is being undertaken into the use of these complex pieces of hardware and software for a variety of grid support services, on top of fundamental frequency power injection, requiring improved control for non-traditional duties. To validate these results, small-scale laboratory hardware prototypes are often required. Such systems have been built by many research teams around the globe and are also increasingly commercially available. Few publications go into detail on the construction options for prototype CMCs, and there is a lack of information on both design considerations and lessons learned from the build process, which will hinder research and the best application of these important units. This paper reviews options, gives key examples from leading research teams, and summarizes knowledge gained in the development of test rigs to clarify design considerations when constructing laboratory-scale CMCs.Item Impact of a resistive superconductive fault current limiter in a multi-terminal HVDC grid(Institute of Electrical and Electronics Engineers Inc., 2018-06-08) Saldana, G.; Etxegarai, A.; Larruskain, D. M.; Iturregi, A.; Apinaniz, S.; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe relevance of multi-terminal HVDC grids is expected to increase in next years. However, there are still several technical, economical and legal limitations that interfere with the construction of those multi-terminal links. One of the main technical obstacles is the handling of DC fault currents, because the interruption of DC currents in HVDC systems is nowadays a challenge. Among other proposals, the application of Superconducting Fault Current Limiters (SFCLs) combined with a mechanical Circuit Breaker (CB) solves technically that issue, according to the analysis and simulation results presented in this paper.