Hitachi Energy was selected by the State Grid Corporation of China (SGCC) to design, engineer and supply key equipment for the Jinping-Sunan ±800 kV Ultrahigh Voltage Direct Current (UHVDC) power transmission project. Commissioning in 2013 will make it the most powerful transmission line in the world.
Hitachi Energy designed the system in close cooperation with SGCC and local Chinese partners, and supplied key components for both converter stations, including converter valves, control and protection system and DC yard equipment. In a separate order, Hitachi Energy was selected to supply the 800 kV UHVDC transformers for both converter stations.
The 2,090-km long UHVDC power link will transport clean hydropower from generating stations in the Yalong River in central-western Sichuan province to the highly industrialized coastal area of Jiangsu province in eastern China. The UHVDC link will have a rated capacity of 7,200 MW and 7,600 MW continuous overload. The two-hour overload is 7,920 MW and the thyristors then handle a record-breaking DC-current of more than 5,000 Amperes.
The Jinping-Sunan transmission is the second Hitachi Energy UHVDC project in China after the highly successful Xiangjiaba-Shanghai transmission and reflects the continued confidence of SGCC in Hitachi Energy’s technologies and globally proven domain expertise in HVDC.
| Main data | |
|---|---|
| Commissioning year: | 2013 |
| Power rating: | 7,200 MW (7,600 MW) |
| No. of poles: | 2 |
| AC voltage: | 525 kV (both ends) |
| DC voltage: | ±800 kV |
| Length of overhead DC line: | 2,090 km |
| Main reason for choosing HVDC: | Long distance |
| Application: | Connecting remote generation |