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Line-commutated converter (HVDC classic) are made with electronic switches that can only be turned on. Voltage-sourced converters are made with switching devices that can be turned both on and off. Line-commutated converters (LCC) used mercury-arc valves until the 1970s, [6] or thyristors from the 1970s to the present day
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]
The converter is usually installed in a building called the valve hall. Early HVDC systems used mercury-arc valves, but since the mid-1970s, solid state devices such as thyristors have been used. Converters using thyristors or mercury-arc valves are known as line commutated converters. In thyristor-based converters, many thyristors are ...
An electrode line is used in some high-voltage direct-current (HVDC) power transmission systems, to connect the converter stations to distant ground electrodes. Many long-distance HVDC systems use sea or ground return for the DC neutral current since this is considerably cheaper than providing a dedicated metallic return conductor on an ...
This is one of the lowest ESCR values ever achieved with a line-commutated HVDC converter. McNeill was also the first HVDC station to use three-phase, four-winding converter transformers. The transformers, which are connected to 138 kV on the Alberta side and 230 kV on the Saskatchewan side, are each equipped with a 25 kV tertiary winding (to ...
The HVDC back-to-back facility Shin Shinano uses line-commutated thyristor converters. The station houses two converters, one of which opened in December 1977, [ 1 ] the other in 1992. The original 1977 converter was one of the first thyristor-based HVDC schemes to be put into operation in the world and used oil-insulated, oil-cooled outdoor ...
Line commutated converter technology is used at each HVDC converter to maximise the amount of electrical power that can be transferred, which is predominantly exported from renewable sources in Scotland. This type of HVDC conversion technology means that large filter halls are required at each converter station. [10]
The normal current rating in the de-icer mode is 7200 Adc, defines at an ambient temperature of +10 °C. The current rating is too high for a single converter bridge based on present-day HVDC technology. However, with two converter bridges in parallel, the required dc current per bridge can be met with 125 mm thyristors used in HVDC converters.