Ultra-High-Voltage Direct Current (UHVDC)
Efficient bulk power transmission
Growing power demand and the worldwide push for the decarbonization of energy systems call for new approaches in power transmission. The challenge is to establish bulk power transmission systems to get power from lucrative but far off renewable energy sources right to the load centers. UHVDC transmission technology from Siemens provides the efficient, reliable solution.
How to transmit more power over longer distances at lower losses
At the core of a UHVDC transmission system is the converter. It consists of a number of thyristor modules equipped with Siemens thyristors of up to 6-inch. Typically, the valves of one pole are arranged in two series-connected 12-pulse groups to overcome possible transport limitations. A major benefit of this layout is the relatively small size of the converter transformers. It also increases the redundancy of the bulk power transmission system, as each of the four converters can be bypassed with the assigned DC line still operating at a reduced voltage level of 400 kV.
The next level of HVDC technology was ushered in when Siemens developed its 6-inch thyristor and all other components required for UHVDC converter stations. Thanks to the ability to produce the entire range of components required for 800 kV DC power transmission, Siemens can supply turnkey solutions for complete UHVDC transmission systems.
Yunnan-Guangdong, the world’s first UHVDC transmission project, which had been contracted to Siemens by China Southern Power Grid in 2007, started commercial operation of the first pole in December, 2009. The first bulk power transmission system equipped with 6-inch thyristors from Siemens, the Xiangjiaba-Shanghai UHVDC system in China, commenced operation in 2010. Another huge Siemens ±800 kV UHVDC project was implemented in Brazil.
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The only way to make a difference is to get involved. It’s easy to sit back and wait for others to do something but when you are staring at 75-85m towers in a few years time, you will kicking yourself for not doing something when you had the chance. This is OUR only chance to stop these towers, so get involved now.
Welcome to the home of Darley Power Fight. A group of residents in Darley, Coimadai and Merrimu, united against high voltage transmission towers passing through our backyard. We came together through the realisation the transmission line will divide a narrow corridor between Darley and the Lerderderg State Park; altering landscape character, causing widespread damage to critical habitat for threatened species, increasing fire risk to the Park and thousands of residents, destroy our visual amenity, harm local agriculture and will impact businesses and property values. It will completely desecrate, in a few years, what nature has taken millions of years to create.
