The First UHVDC Project

Xiangjiaba Shanghai was the first ultrahigh-voltage direct current (UHVDC) project in the world to go into commercial operation, in July 2010.

State Grid Corporation of China (SGCC) is the owner of the link and ABB is the main technology supplier. The ±800 kV UHVDC link, with a rated power of 6,400 MW, has the capacity to transmit up to 7,200 MW of power from the plant in the southwest of the country to Shanghai, about 2,000 km away. System voltage at ±800 kV is 33 percent higher than the voltage used for the ±600 kV Itaipu transmission in Brazil, which until then was the world’s highest HVDC transmission voltage rating. The power rating at 6,400 MW is also record breaking, while losses were reduced to 7 percent, compared with 10 percent losses on conventional 500 kV DC transmission lines, according to ABB.

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