Recently, Zhangbei's renewable energy flexible DC power grid test pilot project was officially started. This is the world's first flexible DC power grid project, and also the world's most flexible voltage DC project with the highest voltage rating and the largest transmission capacity. According to Shu Yinyu, chairman of the State Grid Corporation of China, the core technologies and key equipment of the project are internationally pioneered, creating 12 projects in the world, and innovation leads and demonstrations are of great significance.
Economic Daily reporter learned that the project rated voltage of ± 500 kV, will build 666 km ± 500 kV DC transmission lines, the new Zhangbei, Kangbao, Fengning and Beijing 4 converter stations, the total converter capacity 9 million kilowatts; total investment of 12.5 billion yuan in engineering, and strive to ensure that all the first half of 2020 completed and put into operation.
Flexible HVDC power transmission is a cutting-edge technology in today's power grid technology field, with significant advantages such as good controllability, flexible operation modes, and large number of applicable occasions. It has unique advantages in remote areas and offshore new energy grid connection and asynchronous grid interconnection applications.
Specifically, the flexible DC adopts a fully-controlled power electronic device that can be automatically turned off, does not require the AC system to support commutation, has dynamic reactive power support capability, can effectively suppress AC voltage fluctuations, and reduce power fluctuations affecting the receiver power grid; At the same time, it also has the advantages of long transmission distance and large transmission capacity, which can support the large-scale development of new energy. The DC grid constructed based on the flexible DC transmission technology can realize multi-power supply, multi-drop power reception and new energy island access, and has better economical efficiency and flexibility. It can integrate wind power, photovoltaic, pumped storage and load centers. Direct connection forms a flexible and complementary energy internet of various forms of energy, which can effectively suppress the volatility of new energy sources. In addition, the DC grid can also be quickly removed and isolated faults, and can give full play to the advantages of the DC grid network, greatly improving the reliability of power transmission.
Shuyin Yin said that the construction of the Zhangbei flexible DC project has significant comprehensive benefits and strategic significance for promoting energy transformation and green development, serving the Beijing low-carbon and green Olympic Winter Games, leading science and technology innovation, and promoting the transformation and upgrading of the equipment manufacturing industry.
Hebei Zhangjiakou is a national comprehensive demonstration area for renewable energy. The current installed capacity is more than 10 million kilowatts, and it is planned to exceed 20 million kilowatts by 2020. However, the capacity for local consumption is insufficient and it needs to be sent out to a large scale. The construction of this project will connect the Zhangbei New Energy Base, Fengning Energy Storage Power Supply and the Beijing Load Center, promote the complementarity and flexibility of various forms of energy, and improve the safety and stability of the power system. This will be a large-scale application of flexible HVDC transmission in China. Build a DC grid to accumulate relevant experience.
More importantly, the project will help China to seize the commanding heights of the global power grid technology. "Zhangbei Flexible DC Project is a major scientific and technological experiment and demonstration project that integrates friendly access of large-scale renewable energy sources, complementation of various forms of energy and flexible consumption, and construction of a DC grid," said Shuyin Yin.
In addition, Zhangbei Flexible DC Project has the advantages of long industrial chain and strong power, which can effectively promote the development of electrical equipment industry, etc.; and will further promote China's original innovations in the field of flexible HVDC and DC power grids to promote higher voltage and greater The innovative development of capacity-flexible DC technology will drive the upgrading of power grid technology and equipment manufacturing industries, consolidate China’s international leading position in the DC transmission technology field, and create favorable conditions for the implementation of DC technology and major equipment “going out†strategies.
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