Analysis of New Transmission and Transformation Technology

Science and technology are the primary driving forces behind social transformation, and the path of technological advancement continues to shape the future. In China, as the power grid construction landscape evolves rapidly, those who stay ahead of the latest technological trends and understand the direction of development will secure a competitive edge. Currently, five emerging power transmission technologies being or about to be implemented by the State Grid Corporation of China have drawn significant attention from industry experts. The first is Ultra High Voltage (UHV) DC transmission technology. According to the company's plan, seven UHV DC lines were expected to be built by 2015, with up to 27 projects completed by 2020. By 2012, several key projects had already been launched or were under construction, including the Yuncheng-Jingping, Zhengzhou-Hami, and Xiluotang lines. Additional projects like Ningdong-Zhejiang and Mengxi-Hubei were also approved for construction in 2013. The State Grid is now developing ±1100 kV DC technology, which will use large-section, eight-split conductors to increase transmission capacity to over 13 million kilowatts. Existing ±800 kV lines can carry up to 10 million kilowatts, with the second Jinping-Sunan line currently transmitting 7.2 million kilowatts. The second innovation is flexible DC transmission technology. The State Grid has launched the Dalian cross-sea flexible DC project and the Zhoushan multi-terminal flexible DC project. The Dalian project, with a capacity of 1,000 MW and voltage of ±320 kV, uses 67.2 km of cable, including 54 km underwater. The Zhoushan project connects five islands with a 1,000 MW capacity at ±200 kV, using 140 km of cable, and is scheduled to start operations this year. Third is the next-generation smart substation technology. The State Grid has adopted four models: 220 kV AIS and GIS stations, and 110 kV AIS and GIS stations. This year, two 220 kV substations will be built, along with four 110 kV ones. In the coming years, the company plans to build 50 new smart substations and complete demonstration stations for 500 kV and 330 kV systems. These substations feature reduced space usage through innovations such as integrated smart circuit breakers and optimized busbar configurations, signaling a growing market for smart switchgear. Fourth is standard distribution smart substation technology. This approach focuses on standardized design, industrialized processing, and modular construction. The first phase includes building five smart substations with prefabricated components to minimize on-site work. The second phase aims to expand to 25 stations, incorporating prefabricated GIS buildings and plug-and-play secondary equipment. This trend highlights a shift toward efficiency and modularity in substation design. Finally, intelligent AC transmission lines utilize advanced materials, flexible control, and information communication. Technologies like UAV inspections, dynamic capacity expansion, and energy-saving conductors are transforming the sector. With these innovations, the power grid is set to become more efficient, safe, and environmentally friendly. In conclusion, the rapid development of these five technologies is reshaping the power grid landscape. As the State Grid continues to invest in modernization, the future of power transmission looks promising. Let’s watch closely as these advancements unfold.

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