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A 12-pulse HVDC converter using mercury arc valves, with a bypass valve and bypass switch across each of the two 6-pulse bridges: A 12-pulse HVDC converter using thyristor valves: Explain the concept of quadrivalve by HVDC
At 12 pulse converter stations, only harmonic voltages or currents of the order 12n + 1 and 12n - 1 (on the AC side) or 12n (on the DC side) result. Filters are tuned to the expected harmonic frequencies and consist of series combinations of capacitors and inductors.
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]
Bipole 1 consists of six 6-pulse converter groups at each end (three in series per pole), each originally rated at 150 kV DC, 1800 A. [6] Each converter group can be bridged at the DC side with a vacuum switch. Subsequent upgrades have increased the current rating to 2000 A and the voltage rating of most equipment to 166 kV per bridge (i.e ...
Consequently, with a DC voltage of ±450 kV, the converter for the NorNed project has a terminal to terminal DC voltage rating of 900 kV, making it (as of 2012) the highest voltage rating of any HVDC converter in the world. The connection has a loss of 4.2% (95.8% efficiency). [11]
However, with two converter bridges in parallel, the required dc current per bridge can be met with 125 mm thyristors used in HVDC converters. With two thyristor converters connected in parallel, there are several possible circuit topologies. The three main alternatives considered were: Twelve Pulse Circuit, Double Twelve Pulse Circuit, Double ...
The Eel River Converter Station consists of two separate 12-pulse bidirectional solid-state non-synchronous HVDC ties of 4800 thyristors [2] (each nominally rated 160 MW) connecting 230-kV transmission systems of Hydro-Québec and NB Power. The converter station has a nominal throughput rating of 40 MW to 320 MW and an overload capability of up ...
In 2004, Sylmar East station was upgraded from 1,100 MW to 3,100 MW (rededicated as the Sylmar Converter Station in 2005). The controls and older converters, including the mercury arc valves, were completely replaced (in the same valve hall) by a single pair of 3,100 MW 12-pulse converters built by ABB.