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An example is the 2,000 MW Quebec - New England Transmission system opened in 1992, which is currently the largest multi-terminal HVDC system in the world. [ 41 ] Multi-terminal systems are difficult to realize using line commutated converters because reversals of power are effected by reversing the polarity of DC voltage, which affects all ...
Supplier: ABB; One of the World's biggest Multi-terminal HVDC system with Ultra High Voltage DC Transmission system (UHVDC) [45] CASA-1000: Tajikistan - Sangtuda: Pakistan - Nowshera: 750: 500: 1300: 2025: Thyr: ±500 kV Bipole HVDC with Converter Stations [46] [47] India–Sri Lanka HVDC Interconnection: Madurai - India Anurathapura - Sri ...
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.
As of 2012, it remains one of only two Multi-terminal HVDC systems in the world (the other one being the Sardinia–Corsica–Italy system, completed in the same year) and is "the only multi-terminal bipole HVDC system in the world where three stations are interconnected and operate under a common master control system". [4]
It is unusual, having more than two converter stations as part of a single HVDC system, and (as of 2012) is one of only two multi-terminal HVDC systems in operation in the world (the other multi-terminal scheme being the Quebec – New England Transmission system linking northeastern United States with Quebec in Canada).
An HVDC converter station (or simply converter station) is a specialised type of substation which forms the terminal equipment for a high-voltage direct current (HVDC) transmission line. [1] It converts direct current to alternating current or the reverse. In addition to the converter, the station usually contains:
From there, a subsea cable runs to landfall at Noss Head in Caithness, with onward connection to an HVDC switching station north of the village of Staxigoe in Caithness. [ 6 ] [ 19 ] The route of the cable crosses TAT-10 , TAT-14 and Atlantic Crossing 1 telecommunication cables and the Piper – Flotta oil pipeline.
The line then continues heading south-southeast and enters the state of New Hampshire, where it reaches the Comerford terminal near Monroe. Continuing southward into Massachusetts, the line reaches the Sandy Pond terminal outside of Boston in Ayer. [59] The terminal is the southernmost extent of the HVDC line. [33] [57]