Flexible HVDC transmission is an important equipment for building a smart grid. Compared with the traditional approach, flexible HVDC transmission has strong technologies in island power supply, urban power distribution network expansion, AC system interconnection, large-scale wind farm interconnection, and other aspects. Advantage is the strategic choice to change the development pattern of large power grids. “In recent days, Rao Hong, Dean of the Southern Net Academy of Science, presented at the 2013 ARRCC-CIGRE Technical Conference. Flexible DC technology accelerates application With the formation of large-area exchange large-scale power grids, the technical problems of the dominant AC grids are constantly emerging, such as synchronization, low stability, and limited transmission distance. Under such circumstances, countries around the world have begun to speed up the study of modern HVDC transmission technologies, especially the application of flexible HVDC transmission technology. In China, the State Grid Corporation of China launched a special study on flexible HVDC transmission technology in 2006. In July 2011, it launched the Shanghai Nanhui Wind Farm Flexible HVDC Transmission Project (with a transmission capacity of 20 MW and a DC voltage level of ±30 kV). Asia's first flexible HVDC project with independent intellectual property rights. At the same time, Dalian, Xiamen and other places have also begun to promote flexible DC transmission projects. Moreover, while speeding up the application of flexible HVDC transmission technology at both ends of the peer-to-peer network, China has also planned two multi-terminal flexible HVDC transmission projects: the world’s first five-terminal flexible HVDC transmission project—the Zhoushan ±200 kV flexible HVDC transmission demonstration project. In late August, it entered the phase of full-scale construction; Southland Nan'ao Wind Farm four-terminal flexible DC transmission demonstration project, DC voltage ± 160 kV, transmission capacity of 200,000 kilowatts, is expected to be completed in 2014. According to a related official from the State Grid, “DC power transmission at both ends can only achieve point-to-point DC power transmission, and flexible DC projects at both ends can transmit clean energy from multiple sites.†As the industry gradually realizes that flexible DC transmission technology is in renewable energy sources, With the important role of smart grid construction, China's flexible DC transmission technology has begun to accelerate the application of engineering. Solve the problem of new energy integration and power supply in big cities It is understood that, compared with traditional DC transmission, the advantages of flexible DC transmission are mainly reflected in the island power supply, active power and reactive power control. For example, in island power supply, the conventional DC requires a power point such as a generator set on the island, and the flexible DC only requires the power of the device to start. Zheng Xinlong, director of the Integrated Technology Research Office at Zhejiang Ocean Power Transmission Research Center, Zhoushan Power Supply Company, Zhejiang Province, vividly described: “Comparing active power and reactive power to the hot water and cold water pipes in a shower room, both are essential. Conventional DC only Can control hot water pipes, and flexible DC can flexibly regulate the flow of cold water and hot water, water volume, proportion, etc." Compared with AC transmission, the advantages of flexible DC transmission are mainly reflected in long-distance transmission, new energy consumption, and cost control. For example, in long-distance cable transmission, the longer the AC cable is, the higher the power loss is, and the less effective electric energy is transferred. Just as boiling water is sent out along the pipe, the longer the pipe is, the lower the water temperature is, and the end user will not use it. Hot water is used; flexible DC is equivalent to a heat pipe, even if the end user, the water temperature is constant. More importantly, flexible DC transmission can carry clean energy such as wind energy and solar energy from multiple sites, and it can reach the load centers of multiple cities through large-capacity, long-distance power transmission channels. This is a new energy integration and large-scale energy network. Urban power supply and other fields provide an effective solution. For example, Zhoushan’s multi-terminal flexible DC transmission project will construct a converter station in Dinghai, Laoshan, Laoshan, Yangshan and Caojiao respectively. At that time, Zhoushan will form a direct-current transmission network between major islands in the north, strengthen the electrical connections under the jurisdiction of the islands, and lay a foundation for the development of new energy sources such as wind power. Will be applied in more fields through research and pilot It can be seen that the flexible DC transmission technology that combines so many advantages is naturally favored by all countries in the world. For example, the United States, Britain, and Germany all plan to build 50 or so flexible DC transmission lines by 2020. Tang Guangfu, general manager of China Power Smart Grid Research Institute, CLP Power Electronics Engineering Co., Ltd. said earlier: “With the continuous improvement of the level of manufacturing of switchable devices and DC power grids, flexible DC transmission will become the most important transmission method in DC power grids. "The data shows that with the rapid development of new energy sources, the market demand for flexible DC transmission technology will be even stronger. In the next ten years, the world's flexible DC transmission market will be over 100 billion yuan. For the development of flexible HVDC technology, Rao said: “Flexible HVDC will also face the challenge of how to achieve high voltage, high power, overhead line use, hybrid structure HVDC transmission, etc. Nannan will go through further research and pilot projects. This technology has been applied to a large-scale wind farm access system, realizing regional networking to improve power supply reliability, and alleviating operational pressures in power-intensive areas such as power grids.
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