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Science and technology serve as the primary driving forces behind social transformation. The path of technological advancement shaping the future has always been consistent. In China, as the power grid construction landscape continues to evolve, those who master the latest technological trends and anticipate the direction of development will secure a competitive edge. Currently, five key new power transmission technologies being or set to be implemented by the State Grid Corporation of China are gaining significant attention.
The first is Ultra High Voltage Direct Current (UHV DC) transmission technology. According to the State Grid’s plan, seven UHV DC lines were scheduled to be built by 2015, with a total of 27 projects completed by 2020. By 2012, several projects had already been launched or were under construction, including the Upline, Jinping-Sunan, Zhengzhou, Hami, Xiluo, West Zhejiang, and others. Additional projects such as Ningdong-Zhejiang, Ximeng-Taizhou, and Mengxi-Hubei were expected to be approved for construction in 2013.
The company is also developing ±1100 kV DC transmission technology, featuring large-section, eight-split conductors. This technology aims to increase transmission capacity to over 13 million kilowatts for the ±1100 kV lines, while ±800 kV lines could reach up to 10 million kilowatts. The second line of the Jinping-Sunan project currently has a capacity of 7.2 million kilowatts.
The second innovation is Flexible DC Transmission Technology. The State Grid plans to build a Dalian cross-sea flexible DC demonstration project and a multi-terminal flexible DC project on Zhoushan Island. The Dalian project, with a capacity of 1,000 MW at ±320 kV, will use 67.2 km of cable, including 54 km underwater. The Zhoushan project, which connects five islands, will operate at ±200 kV with a total length of 140 km, and is expected to be operational by June this year.
Third is the New Generation Smart Substation Technology. The State Grid has adopted four smart substation designs: 220 kV AIS, 220 kV GIS, 110 kV AIS, and 110 kV GIS. This year, two 220 kV substations, including Beijing Science and Technology City GIS and Chongqing AIS, will be built, along with four 110 kV stations. Over the next two years, 50 new smart substations will be constructed, alongside 500 kV and 330 kV demonstration stations.
The 220 kV AIS station reduces the land area by about 40% compared to previous models, thanks to streamlined isolating switches and integrated smart circuit breakers. As more of these stations are built, smart circuit breakers are expected to become a growing market trend.
Fourth is the Standardized Distribution Smart Substation Technology. It focuses on integrating new technologies to improve efficiency through standardized design, prefabricated components, and modular construction. The first phase includes building five distribution-type smart substations, aiming to minimize on-site work and standardize equipment and cabling. The second phase involves 25 stations with prefabricated GIS buildings and plug-and-play systems, signaling a shift toward modularity in substation design.
Finally, the Intelligent AC Transmission Line integrates advanced materials, control systems, and communication technologies. Features like UAV inspections, dynamic capacity expansion, and energy-saving conductors enhance safety, efficiency, and environmental performance. These innovations open up new opportunities for related products.
In conclusion, the rapid growth in power grid construction has sparked widespread interest in these five technologies. As they continue to develop, the future of the power grid looks promising, and we can expect exciting changes ahead.
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