![<?echo $_SERVER['SERVER_NAME'];?>](/template/twentyseventeen/skin/images/header.jpg)
Recently, Liu Zehong, deputy general manager of State Grid Corporation of China, attended the Sutong GIL Integrated Pipe Gallery Project Shield Tunnel Passing Site Meeting and Engineering Construction Work Coordination Meeting in Jiangsu Province, and surveyed the Baihetan-Jiangsu ±800 kV UHV DC project receiving site. Hold a site plan report meeting. Liu Zehong emphasized that under the dual requirements of urban development and environmental protection, Suzhou needs to further introduce clean power outside the district. Baihetan Hydropower is located in Suzhou and innovatively adopts mixed cascade multi-end soft technology to protect Suzhou's “fourteenth five-year†economic society. The inevitable choice for development.
East China UHV is the most dense
The Sutong GIL Integrated Pipe Gallery project is the main road and control project for the East China UHV AC ring network. It is planned to be completed and put into operation in 2019.
It is understood that the East China UHV AC ring network consists of Huainan-Nanjing-Shanghai 1000 kV UHV AC project, Huainan-Zhebei-Shanghai 1000 kV UHV AC project, which is also connected with Zhebei-Fuzhou 1000 kV. The high-voltage exchange project forms the East China UHV network. At the same time, the UHV DC project currently being fed into the network has ±800 kV UHV, such as Xiangjiaba-Shanghai, Jinping-Sunan, Jinbei-Jiangsu, Ximeng-Taizhou, and Zhundong-Weinan, which will be completed and put into operation. ±1100 kV UHV DC engineering. It can be seen that East China is the most dense area of ​​China's UHV AC-DC project.
At 13:15 on August 8, Jiangsu Power Grid dispatched the highest power load of 102.26 million kilowatts, which was the highest value of 10.219 million kilowatts last year, a record high. It became the first power load of the State Grid system to break through 100 million kilowatts for two consecutive years. Provincial power grid. Among them, on July 26, Suzhou's electricity load hit a new record of 26.02 million kilowatts. It is predicted that with the continuous development of the economy and society, the future electricity load of Suzhou and even Jiangsu will continue to rise. Therefore, in the “throttleâ€, “open source†is needed.
In this regard, Chen Weijiang, an academician of the Chinese Academy of Sciences and deputy chief engineer of the State Grid, said at the 2018 China Hydropower Development Forum that in order to cooperate with hydropower delivery, it is recommended to build a Baihetan-Jiangsu, Baihetan-Shandong ±800 kV UHV DC project. In other words, Jiangsu will add a new UHV DC transmission channel. At that time, the project will achieve mutual benefit with the UHV AC-DC project in Huainan-Nanjing-Shanghai, Jinping-Sunan, Jinbei-Jiangsu.
Suzhou will usher in the second DC UHV
The first UHV DC project in Suzhou - Jinping - Sunan UHV undertook the mission of the Yalong River Basin and the Jinping I and II hydropower stations, as well as the surplus water and electricity in Sichuan's Fengshui period. Since the project was put into operation in December 2012, it has been operating at a large load and full load for many years, and has delivered more than 185.9 billion kWh of clean water and electricity to Suzhou. At 0:00 on June 15 this year, the project load was increased to 6.84 million kilowatts, entering the high-power operation stage. According to the plan, it is expected to be delivered to November, and the full load is equivalent to 1/4 of the maximum dispatching load forecast of Suzhou.
The total installed capacity of Baihetan Hydropower Station is 16 million kilowatts. After completion, it will become the world's second largest hydropower station after the Three Gorges Power Station. According to the plan, the Baihetan Hydropower Dam will be closed for water storage in May 2021. In the same year, the first batch of units will be put into operation, and all units will be completed and put into operation by the end of 2022. In order to ensure that the power station can be put into production, the State Grid will start the preliminary work of the Baihetan-Jiangsu UHV DC project ahead of schedule and will be located in Suzhou. It is understood that the project will increase the power supply of 8 million to 10 million kilowatts for Suzhou during the "14th Five-Year Plan" period, meeting the demand for power consumption of Suzhou 41 million kilowatts in 2030.
In order to ensure that calls outside the UHV area fall, the Suzhou Power Supply Company continues to accelerate the construction of the power grid. At the same time, the 2×300 thousand-plus synchronous camera project of Suzhou Tongli Converter Station is also steadily advancing. It is expected to be completed and put into operation at the end of the year, which will provide dynamic and reactive support for the safe and stable operation of UHV receiving power grid.
Innovative technology to ensure safe operation
In recent years, with the advancement of technology, the operating efficiency of UHV has been continuously improved. Among them, Xiangjiaba-Shanghai UHV rated transmission power is 6.4 million kilowatts, the maximum continuous transmission power is 7.2 million kilowatts; Jinping-Sunan high pressure rated transmission capacity is 720. Ten thousand kilowatts, the maximum continuous transmission capacity is 7.6 million kilowatts; Jinbei-Jiangsu UHV rated transmission capacity is 8 million kilowatts; Ximeng-Taizhou UHV is the world's first rated capacity of 10 million kilowatts, receiving layered access 500 ±800 kV UHV DC engineering for kV/1000 kV AC grid.
It is understood that the UHV DC receiving end is connected to the 500 kV and 1000 kV AC systems, which organically combines the advantages of UHV AC and DC, significantly enhances the system's stability control capability, and provides a new and efficient way to develop large energy bases. The program that can be promoted has set a new benchmark for power technology in the world. At the same time, these projects have successfully developed a variety of new equipment, realized the localization of UHV complete sets of equipment and key raw materials and components, and promoted the overall upgrade of China's electrical equipment industry.
For the Baihetan-Jiangsu UHV, which is carrying out preliminary work, Liu Zehong said that it will adopt innovative hybrid cascade multi-end straightening technology. Among them, the hybrid cascading and sending end adopts the traditional direct current and the flexible direct current technology based on the voltage source control, and the multi-terminal soft straight-end adopts the multi-terminal flexible direct current technology, which has the advantages of good compatibility and high reliability.
At present, the Wudongde Power Station under construction in the South Network is sending electricity to Guangdong Guangxi UHV multi-terminal DC demonstration project, which adopts ±800 kV three-terminal hybrid DC technology. The Yunnan Kunbei converter station at the sending end adopts UHV conventional DC, and the receiving end Guangxi Liubei Converter Station and Guangdong Longmen Converter Station adopt UHV flexible DC technology. In contrast, Baihetan-Jiangsu UHV technology level is further innovated and improved.
In addition, Liu Zehong also requested that the relevant participating units of the project should pre-establish the safety and stability of the receiving power grid, further optimize the access system scheme and the DC technology scheme based on the location selection scheme of the receiving converter station, and fully promote the engineering feasibility study. Waiting for the preliminary work.
Aluzinc Coils,Galvalume Coil,Aluzinc Steel Coil,Galvalume Steel Coil
SHANDONG XINGHAN MATERIAL CORPORATION , https://www.xinghansteel.com