HVDC Three Gorges – Changzhou

The HVDC Three Gorges Dam - Changzhou is a 890 km long high voltage direct current transmission line ( HVDC) in the People's Republic of China between the Three Gorges dam and the eastern prefecture-level city and industrial region Changzhou (Chinese常州 市) in Jiangsu Province. It is used to transport electrical energy from the hydroelectric power plant on the Yangtze River in the eastern industrial regions of China. The line was put into operation in 2003, was the second HVDC line in China, and in commissioning the largest HVDC in China. The western converter station is located 50 km from the Three Gorges Dam located in Longquan, the eastern station in Zhengping near Changzhou.

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The HVDC Three Gorges Dam - Changzhou is a bipolar HVDC with an operating voltage of ± 500 kV and a transmission capacity of 3,000 MW. The inverters in the converter stations are equipped with thyristors, which can switch a maximum current of 3 kA at a reverse voltage of 7.2 kV per Thryistor. In the eastern converter station Longquan be per pole 90, and in the western converter station Zhengping 84 thyristors are used per pole. The high voltage line leads in the Yangtze overhead line crossing Wuhu over the Yangtze, which has the highest pylons in HVDC systems.