The Yunnan-Guizhou Interconnection Channel Project, an important project for West-to-East Power Transmission, has resumed work

On February 21, Section 4 of the Yunnan-Guizhou Interconnection Channel Project officially resumed work. So far, the Yunnan-Guizhou Interconnection Project, the country's first two-terminal DC to three-terminal DC project, has fully resumed work under the premise of doing a good job in epidemic prevention and control, and has been put into intensive construction.

The Yunnan-Guizhou interconnection channel project is an important west-to-east power transmission project in the southern region that the country has focused on promoting during the 13th Five-Year Plan period. It is also a key project to achieve mutual assistance and complementarity between Yunnan hydropower and Guizhou thermal power resources and to increase the long-term reserve capacity of the west-to-east power transmission channel. This project is the first DC transmission project in my country that has been changed from "two ends" to "three ends". A new ±500 kV Luquan converter station will be built in Yunnan, and a new ±500 kV DC line will be built to connect to the already built Gaozhao DC Guizhou side, forming a three-terminal ultra-high voltage DC across Yunnan-Guizhou-Guangdong. It is planned to be completed and put into operation by the end of June 2020. After it is put into operation, it will form a power transmission complex between Yunnan and Guizhou provinces, and transmit more clean electricity to Guangdong. It plays a very important role in helping the hydropower consumption in the southwest region, improving the sustainability of west-to-east power transmission, and helping the construction of the Guangdong-Hong Kong-Macao Greater Bay Area.

The 4th section of the Yunnan-Guizhou Interconnection Channel Project is located in Reshui Town, Xuanwei City, Yunnan Province. At 9 am on the 21st, the construction workers took their body temperatures, put on masks, and entered the B28# tower position to carry out tower assembly work after completing the safety briefing. At the same time, construction work was also underway at the N7005# tower position in Shuicheng County, Liupanshui City, Guizhou Province, 130 kilometers away.

Construction of the 7th section of the Yunnan-Guizhou interconnection project has resumed. Photo by Zhao Peng

As the construction unit of the Yunnan-Guizhou interconnection project, the Southern Power Grid Ultra-High Voltage Company, on the basis of doing a good job in epidemic prevention and control, took the initiative to connect with local government departments to implement the specific requirements for resumption of work and production. Taking into account the progress of each section of the project construction, personnel, equipment, tools and transportation and other related constraints, the project was scientifically and orderly organized to promote the resumption of work. On February 13, 17, and 18, Gaopo Converter Station, Luquan Converter Station, and Zhaoqing Converter Station resumed work one after another. With the resumption of work on the lines in Yunnan and Guizhou, the entire project has been fully resumed.

Construction of the 7th section of the Yunnan-Guizhou interconnection project has resumed. Photo by Zhao Peng

"Before entering the construction site, we will implement real-name management for each construction worker to ensure that the nucleic acid and CT examinations are normal, and various epidemic prevention and control measures are implemented accurately. Workers and managers must measure their body temperature twice a day and eat at different times." Zhao Jun, director of the Infrastructure Department of the Guiyang Bureau of the State Grid Corporation of China, introduced that they also arrange a party member every day to supervise epidemic prevention measures, and organize party member assault teams to take the lead, actively participate in epidemic prevention and control and engineering construction, strengthen the management and control of medium and high-risk operations, and strictly control the safety and quality of engineering construction.

Behind the resumption of work on the project, scientific and technological research work is being pushed forward simultaneously. The Southern Power Grid Ultra-High Voltage Company actively organized the three-terminal DC control and protection system DPT test and carried out joint scientific and technological research. Photo by Peng Guangqiang

It is understood that in this severe battle against the epidemic, while promoting the resumption of construction of the project, the Southern Power Grid Ultra-High Voltage Company has also been pushing forward the scientific and technological research behind the project, and actively organizing the DPT test of the three-terminal DC control and protection system. The test personnel canceled all travel plans during the Spring Festival, returned to the laboratory during the holiday, and arranged internal accommodation and quarantine. As of February 21, 29 tests have been completed.

On February 13, the reconstruction project of Gaopo Converter Station of Yunnan-Guizhou Interconnection was fully resumed. Based on the current requirements for the prevention and control of the new coronavirus pneumonia and the construction goals of the Yunnan-Guizhou Interconnection Channel Project, the Southern Power Grid Guiyang Bureau has focused on epidemic prevention and control on one hand and project construction on the other hand to ensure that work continues and order is not disrupted during this special period. Photo by Zhao Peng

Dong Yanle, manager of the Yunnan-Guizhou Interconnection Project Department of the Southern Power Grid's Ultra-High Voltage Company, said that in order to ensure the construction progress of the Yunnan-Guizhou Interconnection Project, the construction organization will be further optimized, the power outage span will be adjusted in time, and work arrangements such as personnel, machinery, materials, and processes will be made in advance after the resumption of work. More resources will be invested in key construction and key paths to ensure that the project is put into operation as planned.