On June 26, 2021, after 168 hours of trial operation, the Yazhong Jiangxi ±800 kV HVDC transmission project was officially put into operation.
NR provides a complete set of core equipment for the project, such as a UHV converter valve, protection & control, valve cooling, synchronous condenser secondary system, measurement and fire protection system, etc.
hydro, wind, and solar power transmission
The surging power from the middle reaches of the Yalong River will light up the urban and rural areas
Yazhong Jiangxi project starts from Yanyuan County, Sichuan Province, passes through 5 provinces, and ends in Nanchang City, Jiangxi Province. The line length is about 1696 km and the transmission capacity is 8000 MW.
The project is a key channel for hydro, wind, and solar power transmission in the western and southern Liangshan area. After this project is put into operation, the surging power from the middle reaches of the Yalong River will light up the urban and rural areas along the Poyang Lake.
wind & solar resources
At the same time, the Yazhong Jiangxi project also supports the power transmission of the first batch of units of the Baihetan power station and promotes the intensive development and utilization of wind & solar resources in Western Sichuan.
The protection & control system focuses on improving safety and reliability. The project summarizes the previous implementation and operation experience of UHVDC and adopts the asynchronous control technology of the tap changer for the first time, which reduces the regulation times of the tap changer and reduces the risk of on-site accidents.
reactive power control function
Key components such as the equalizing resistor, radiator, and top suspension mechanism of the converter valve
At the same time, considering the diversity of operation modes, the protection & control system of the Yazhong Jiangxi project develops the reactive power control function of the converter station to adapt to the operation of the multi-bus section.
In the aspect of the converter valve, several key components such as the equalizing resistor, radiator, and top suspension mechanism of the converter valve were upgraded and optimized comprehensively.
new packaging process
The tests and inspections were strictly controlled to ensure the engineering quality. In production and transportation, the new packaging process of the converter valve module was developed to ensure transportation quality.
In the project implementation, the test process was comprehensively optimized to improve quality and efficiency. It has passed the tests of harsh transportation conditions in the depth of Daliang Mountain, 2550 meters above sea level, and 9 magnitude earthquake protection.
valve cooling system
The valve cooling control system and DC protection & control system adopt the same UAPC platform
NR provides the Yazhong Jiangxi project with a valve cooling system, which is deeply integrated with the converter valve and protection & control system.
The valve cooling control system and DC protection & control system adopt the same UAPC platform, realizing seamless integration, greatly improving system reliability, and operation & maintenance efficiency.
HVDC systems
The smooth implementation of the Yazhong Jiangxi project highlights NR’s comprehensive capability in the field of HVDC systems.
NR will continuously develop new technologies and expand new applications, provide customers with advanced technologies, reliable products, and high-quality services, and serve the power industry.
