The 6th International Conference on HVDC（HVDC2024）General Programme
Technical Visit
The Changji converter station
The Changji-Guquan ±1100 kV Ultra-High Voltage Direct Current (UHVDC) Transmission Project is the world's first ±1100 kV UHVDC transmission project. The project starts from the Changji converter station in Zhundong, Xinjiang, and passes through six provinces and regions, including Xinjiang, Gansu, Ningxia, Shaanxi, Henan, and Anhui. It ends at the Guquan converter station in Xuancheng, Anhui. The project adopts bipolar transmission with a rated voltage of ±1100 kV, a rated current of 5455A, and a rated transmission capacity of 12000MW. With a total length of 3293 kilometers, it is the world's voltage level direct current transmission project with the longest transmission distance, the largest capacity, and the most advanced technology.
The Changji converter station for the ±1100 kV UHVDC project is considered as its "starting point", covering an area of 630 acres with a total investment of 8.05 billion yuan. The capacity of a single converter transformer reaches 608 thousand volts-ampere (kVA), making it currently the largest converter transformer in China. The converter valve uses 6-inch thyristors for with a flow capacity reaching up to 5455A, which is about 10% higher than conventional valves. Furthermore, the domestic rate for DC core equipment has reached an impressive figure of 99.9%, truly earning its status as one of China's Great Power Heavy Equipment and representing an outstanding business card for State Grid Corporation.
