Five new power transmission and transformation technologies attract companies' attention

With technology leading the future, in the rapidly changing power grid construction in China, whoever masters the latest technological trends and grasps the direction of technological development will win the future. Recently, Shen Jiang, deputy director of the Ministry of Science and Technology of the State Grid Corporation of China, revealed that the State Grid Corporation of China is currently applying or is about to apply five kinds of new power transmission technologies that are worthy of attention.

The first is UHV DC transmission technology. According to the plan of the State Grid Corporation of China, 7 UHV DC lines will be built by 2015, and up to 27 UHV DC projects will be completed by 2020. As of 2012, it has completed or started construction of the UHVDC project of the Upline, Jinping-Su-Nan, Hami South-Zhengzhou, Xiluodu-Zhexi, and will also be approved for construction in 2013 and Ningdong-Zhejiang and Ximeng will be started. Taizhou, Mengxi - Hubei three lines.

In this regard, State Grid Corporation of China is developing a ±1100 kV DC transmission technology that will use large-section, eight-split conductors. It is hoped that the ±1100 kV line transmission capacity will reach 13 million kilowatts or more, and the ±800 kilovolt line transmission capacity will reach 1,000. Ten thousand kilowatts. At present, the second Jinping-Southern Jiangsu line has a transmission capacity of 7.2 million kilowatts.

The second is flexible DC transmission technology. It is reported that the State Grid Corporation of China will build a Dalian cross-sea flexible DC transmission demonstration project and the Zhoushan multi-terminal flexible DC transmission demonstration project. The former aims to improve the reliability of power supply in the southern part of Dalian Power Grid. The project has a transmission power of 1,000 megawatts and a voltage of ±320 kilovolts. It will use 67.2 kilometers of cable, including 54 kilometers of submarine cable and 13.2 kilometers of land cable; In order to solve the problem of offshore wind power grid connection and other needs, a five-terminal cross-sea flexible DC transmission project was constructed on Zhoushan Island, Songshan Island, Daishan Island, Huaifu Island and Yangshan Island. The project has a transmission power of 1,000 megawatts and a voltage of ±200 thousand. V, will use about 140 kilometers of cable, including 129 kilometers of submarine cable, 11 kilometers of land cable, plans to put into operation in June 2014.

“Dalian Cross-Sea Flexible HVDC Transmission Demonstration Project is planned to be put into operation in December this year, but now it is stuck on the submarine cable. Such voltage grade submarine cable products can only be imported, and foreign manufacturers said it is difficult to supply them within this time. Therefore, we urgently hope that such key equipment will be domesticated as soon as possible." In response, Shen Jiang said.

The third is a new generation of smart substation technology. At present, the State Grid Corporation of China has adopted four new-generation smart substation programs: the 220 kV AIS station, the 220 kV GIS station, the 110 kV AIS station, and the 110 kV GIS station. According to its planning, two 220 kV substations will be built this year, including the Beijing Science and Technology City GIS station and the Chongqing AIS station; and four 110 kV substations, including Beijing Science and Technology City, Tianjin, Shanghai GIS station and Wuhan Science and Technology City AIS station. . In the next two years, the State Grid Corporation of China will promote the technology on a large scale and plans to construct a total of 50 new-generation smart substations of 220 kV and 110 kV, and complete the construction of 500 kV and 330 kV demonstration stations.

It is reported that the 220 kV AIS station can reduce the occupied area by about 40% compared with the previous smart substation. This is mainly due to the fact that it has made a lot of simplifications for the isolating switch, such as the use of an integrated smart circuit breaker on the 220 kV side. Station side line isolation switch; on the 110 kV side, the double bus bar is optimized as a single bus section, and an integrated intelligent circuit breaker is used to eliminate station outlet and bus side disconnectors. It can be seen that with the increase in the construction of such substations, integrated smart circuit breakers will become a new market hot spot.

According to Shen Jiang, an integrated smart circuit breaker incorporating electronic transformers, isolating switches, and circuit breakers is used. By using enclosed bus bars, the longitudinal dimension of the power distribution unit can be optimized from 128.5 meters to 78 meters. At present, Pinggao and Xidian have been able to produce this product and seize the market opportunities.

The fourth is standard distribution smart substation technology. The purpose of this technology is to integrate and apply new technologies and improve the efficiency of smart substations. To achieve this goal, it is necessary to first realize the standardized design of substations, that is, to use universal design, general-purpose equipment, and standardized connection of primary and secondary equipments, which can be plug-and-play; followed by the need for industrialized processing, and the use of prefabricated cabin combinations for all secondary equipment. The secondary equipment realizes the scale production and integration debugging in the factory, and the buildings adopt the preset structure. The third is the assembly type construction, that is, the on-site assembly of the building, the uniform size of the equipment and the construction technology, and the mechanized construction.

Shen Jiang said that in the first phase, the State Grid Corporation of China hopes to build five distribution-type smart substations in the first half of this year to realize prefabricated power distribution rooms, main control communication rooms, etc., to minimize on-site construction, and to achieve standardization of equipment foundations and prefabricated cabins. Sub-equipment and standardized prefabricated optical fiber cable; In the second phase, 25 stations are planned to be constructed to realize a prefabricated GIS power distribution building, a production complex, plug-and-play secondary equipment, and standardization and modularization of substation control. This trend indicates the direction for the development of related products.

The fifth is the intelligent AC transmission line. The line is supported by advanced materials, flexible control and information communication, and comprehensively uses technologies such as state detection, safety early warning, dynamic capacity expansion, etc. It is safe, reliable, information-integrated, flexible and highly efficient, and energy-saving and environmentally-friendly. UAVs will be used to patrol the line. Helicopter inspection lines, dynamic capacity expansion modules, monitoring devices, new composite poles and towers, energy-saving conductors, and ice-melting devices have brought market opportunities to related products. State Grid Corporation is planning to carry out this work.

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