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Baihetan-Jiangsu ±800KV Ultra-High-Voltage Direct Current (UHVDC) project
On July 1, 2022, the Baihetan-Jiangsu ±800-kilovolt ultra-high-voltage direct current (UHVDC) project, constructed by State Grid Corporation of China, was fully completed and officially commissioned. This project is crucial for ensuring power supply during peak summer demand, serves as important infrastructure for stabilizing the economy and promoting development, and represents a green initiative supporting the "Dual-Carbon" goals as well as an innovation-driven endeavor for technological self-reliance and advancement.
The project starts in Butuo County, Liangshan Prefecture, Sichuan Province, and ends in Changshu City, Suzhou City, Jiangsu Province, passing through five provinces and municipalities: Sichuan, Chongqing, Hubei, Anhui, and Jiangsu. The total line length is 2,080 kilometers, with newly built converter stations in Baihetan and Yucheng. The project has a rated voltage of ±800 kV, a rated transmission capacity of 8 million kilowatts, and a total investment of 30.7 billion RMB.
Reactors: The "Stabilizer" and "Guardian" of UHVDC Transmission
In UHVDC transmission systems like the Baihetan-Jiangsu project, reactors are indispensable critical equipment, playing a vital role in converter stations and serving as the "stabilizer" and "guardian" of the system.
Essentially, a reactor is an inductive coil used to limit short-circuit currents, suppress harmonics, stabilize grid voltage, and provide reactive power compensation. In UHVDC converter stations, the following two main types of reactors are typically applied:
Smoothing Reactor: Connected in series on the DC pole and neutral lines, its primary function is to suppress harmonics on the DC side, prevent overcurrent and overvoltage on the DC line, and ensure smooth and stable DC current. It is one of the core components of a DC transmission system.
Bridge Arm Reactor: In converter stations using Modular Multilevel Converters (MMC), these reactors are connected in series within each bridge arm of the converter valve. Their main functions include:
Limiting fault current: In the event of a short-circuit fault, the reactor quickly limits the rapid rise of current, protecting expensive core equipment such as converter valves from damage.
Suppressing harmonics: Converters generate significant harmonics during operation. Bridge arm reactors effectively smooth the current waveform, reducing harmonic pollution in the power grid and ensuring power quality.
Balancing current: They ensure more uniform current distribution among the internal sub-modules of the converter, enhancing system operational stability and reliability.
Therefore, the performance and quality of reactors are directly related to the safety, stability, and efficient operation of the entire UHVDC transmission system.
Application of Dry-Type Air-Core Reactors in the Baihetan-Jiangsu Project
The Yucheng Converter Station in Jiangsu extensively employed high-performance dry-type air-core reactors for the Baihetan-Jiangsu project.
Product Types: The project utilized various models of dry-type air-core bridge arm reactors, including RKSGKL-480-1910-50 and RKSGKL-150-1910-50.
Technical Advantages: Dry-type air-core reactors are particularly suited for ultra-high-voltage applications demanding extremely high reliability due to their maintenance-free operation, excellent linearity, strong anti-saturation capability, superior heat dissipation, and ease of installation.
Technical Parameters: These reactors feature high voltage levels (500kV) and high current-carrying capacity (2250A). With outstanding performance, all products passed stringent type tests conducted by the China Electric Power Research Institute, fully meeting the demanding operational requirements of the Baihetan-Jiangsu project.
These high-performance reactors provide robust support for the stable operation of the Yucheng Converter Station, aiding the efficient and reliable transmission of clean hydropower through this major energy artery spanning east and west. They significantly contribute to China's achievement of its "Dual-Carbon" goals and the promotion of green economic development.
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