Flexible DC transmission technology is one of the effective technical means to solve the problem of new energy grid connection and consumption. The Zhangbei Renewable Energy ±500 kV flexible DC power grid demonstration project being planned by the State Grid Corporation is the world's highest voltage level and the largest transmission capacity. This project requires DC circuit breakers to have fast recombination capability, and the requirements for DC circuit breakers are extremely demanding. In view of the high voltage and high current breaking of ±500 kV DC circuit breaker, Nanrui Jibao Company has creatively proposed the topology of high-voltage hybrid DC circuit breaker with completely independent intellectual property rights, and completed the large-scale power electronic device. Research on key technologies such as current-off transient characteristics, high-speed mechanical switching, ultra-high-speed switching, and high-potential power supply; analyzing and combing various extreme electrical stresses of high-voltage DC circuit breakers, and proposing targeted tests The testing program completed the construction of a complete 500 kV test platform, which can effectively verify the electrical, magnetic, thermal and mechanical properties of the HVDC breaker. The successful development of ±500 kV high-voltage DC circuit breaker has filled the gaps in the field of flexible DC transmission in China and even the world, and will greatly promote the engineering application of high-voltage DC circuit breakers, which is the company's Zhangbei renewable energy ±500 thousand The Volt DC voltage demonstration project provides solid support. The key technical innovations of ±500 kV DC circuit breakers will also drive the technological development and manufacturing capabilities of China's power electronics semiconductor devices, special high-voltage switches and other related fields, and further consolidate China's technological leadership in the development of flexible DC transmission core equipment. .
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Recently, news came from Nanrui Group Co., Ltd. that the world's first ±500 kV high-voltage DC circuit breaker independently developed by the company's Nanrui Jibao Company has completed various types of test projects. The circuit breaker can break 25 kA DC current within 3 milliseconds, and the technical indicators have reached the international leading level. The test results indicate that Nanrui Jibao Company has once again made a major breakthrough in the research and development of flexible DC transmission core equipment, laying a foundation for the leap-forward development of China's flexible DC transmission technology.