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When line commutated converters are used, the converter station will require between 40% and 60% of its power rating as reactive power. This can be provided by banks of switched capacitors or by synchronous condensers, or if a suitable power generating station is located close to the static inverter plant, the generators in the power station ...
Valve hall at Henday converter station, part of the Nelson River DC Transmission System in Canada. Because HVDC allows power transmission between unsynchronized AC distribution systems, it can help increase system stability, by preventing cascading failures from propagating from one part of a wider power transmission grid to another. Changes in ...
As of 2012, thyristor valves had been used on over 100 HVDC schemes, with many more still under construction or being planned. The highest power rating of any single HVDC converter (twelve-pulse bridge) in operation was 2000 MW in 2010, on the ±660 kV Ningdong–Shandong scheme in China.
Large butterfly valve used on a hydroelectric power station water inlet pipe in Japan. Duplex valve in wafer butterfly configuration. A butterfly valve is a valve that isolates or regulates the flow of a fluid. The closing mechanism is a disk that rotates.
Beside the valve hall there is often an additional building, in which are control electronics, equipment for valve cooling and valve monitoring, station service power distribution, and amenities for the plant workers. Because of high voltages, access to the valve halls is limited while the static inverter is running.
In case of a single line failure, transmission with reduced power is possible via the surviving pole and return through the earth. The Cahora Bassa HVDC power station under construction in 1974 The Apollo converter station under construction in late 1973 The Apollo HVDC converter station and distribution lines. The Cahora Bassa HVDC line can be ...
The first HVDC Cross-Channel scheme was built by ASEA and went into service in 1961, [4] between converter stations at Lydd in England (next to Dungeness Nuclear Power Station) and Echinghen, near Boulogne-sur-Mer, in France. This scheme was equipped with mercury-arc valves, each having four anodes in parallel. [5]
Pages in category "Power station technology" The following 92 pages are in this category, out of 92 total. ... Larner–Johnson valve; Ljungström air preheater;