Xiangjiaba–Shanghai HVDC system

The system was built to export hydro power from Xiangjiaba Dam in Sichuan province, to the major city of Shanghai.

It also narrowly missed becoming the world’s first 800 kV HVDC line, with the first pole of the Yunnan–Guangdong project having been put into service 6 months earlier.

[3][4] The design is a bipolar system with overhead lines for the high-voltage conductors and ground return for the neutral current.

The Fulong (rectifier) converter station is located approximately 10 km south of Xiangjiaba Dam and is connected to the power plant by four 500 kV AC lines.

Much of the DC equipment at the Fengxia station was provided by ABB, including the thyristor valves and converter transformers.

Block diagram of a bipolar system with ground return as used on the Xiangjiaba–Shanghai project.