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Long distance HVDC lines carrying hydroelectricity from Canada's Nelson River to this converter station where it is converted to AC for use in southern Manitoba's grid. A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. [1]
SEPRI (Electric Power Research Institute, China Southern Power Grid) is technically responsible for the entire project. Multiple suppliers are involved: three different VSC HVDC valve suppliers, two different HVDC land/sea cable suppliers and three different control & protection system/equipment suppliers. [28] [29] Nuozhadu - Guangdong
This makes voltage-source converters much easier to connect into a Multi-terminal HVDC system or "DC Grid". [27] HVDC systems based on voltage-source converters normally use the six-pulse connection because the converter produces much less harmonic distortion than a comparable LCC and the twelve-pulse connection is unnecessary.
450kV HVDC line (at right), on south side of Autoroute 20 east of the Nicolet station near Sainte-Eulalie, Quebec.. The Quebec – New England Transmission (officially known in Quebec as the Réseau multiterminal à courant continu (RMCC) [1] and also known as Phase I / Phase II [2] and the Radisson - Nicolet - Des Cantons circuit, [3] and known in New England as the Northern Pass) is a long ...
HVDC electrodes are also used in some monopolar HVDC systems, for example the Italy–Corsica–Sardinia scheme. [4] In such systems the electrode line permanently carries the same current as the high-voltage conductor; however since the ground current is then only unidirectional, one of the electrodes (the cathode) can be of simpler design ...
Most HVDC schemes using line-commutated converters operate with a SCR of at least 3, but the McNeill scheme was designed to operate with an Effective Short Circuit Ratio (ESCR – a measure which subtracts the harmonic filters from the evaluation of SCR and is more meaningful on very weak AC systems) of less than 1.0 on the Saskatchewan side. [1]