REVIEW: Since the development of the first test circuit in Sweden more than 70 years ago, HVDC transmission systems have rapidly gained popularity and are being used more and more. Since then, major technological changes and cutting-edge research have taken place around the world to extract HVDC VSC. As more and more new energy sources are connected and the deterioration of the environment aggravates, the safety and performance of traditional power transmission systems will also come with higher requirements. At this time, major technological changes and cutting-edge research have taken place around the world to extract HVDC VSC. Flexible DC transmission Proposed flexible DC Flexible DC is a new generation of DC transmission technology with voltage source converter as its core after AC and conventional DC. It is the most controllable and adaptable transmission technology in the world at present. It is known as "Crown of Power Electronic Technology Precious stones "and" the 21st century's most exciting transmission technology revolution. " Flexible DC transmission technology does not have the problem of commutation failure, enabling independent control of active and reactive power and easy construction of multi-terminal DC network, which can improve renewable energy access performance and improve low voltage ride-through capability and system stability. This technology provides a brand new solution for multi-terminal DC network and large-scale urban center load power supply, and can provide safe, economical and efficient power transmission to relatively weak power grids in remote islands and remote areas. It is the best technical means for grid integration of distant sea wind power, Is one of the most distinctive technologies for building smart grids and the global energy Internet, and will bring important changes to transmission modes and grid infrastructure. In recent years in Europe and the United States was a blowout trend. Flexible DC transmission has the characteristics of independently regulating active power and reactive power. Building a flexible DC power grid is significant for grid-connected large-scale new energy sources, improving large-scale long-distance power transmission capacity of the power grid, and improving flexibility and reliability of power distribution in distribution networks. Bring about revolutionary changes to the efficient use of new energy sources and the development of power grids. Development of Flexible DC in China In 2006, the Company organized and guided by the flexible DC team of State Grid Institute of Research Institute of Intelligent Technology to formulate the "Research Framework of Key Technology for Flexible DC Transmission System", marking the official launch of the research on the Company's flexible DC transmission technology. In 2007, the State Grid Chi Institute promoted the establishment of China's leading CIGRE working group - CIGREB4.48 and Dr. Tang Guangfu as the convenor of the working group. In April 2009, State Grid Chi Institute determined a flexible DC transmission technology based on a modular multi-level voltage source converter topology. July 25, 2011, the first flexible HVDC transmission demonstration project in Asia - Shanghai Nanhui wind farm flexible DC transmission project put into formal operation, the company became ABB, Siemens, the world's third complete set of equipment R & D and engineering soft implementation Competent business. January 17, 2013, State Grid Chi Institute of the world's first successful development ± 320 kV / 100 MW kilowatt flexible DC converter valve and valve control equipment, and witnessed by the DNVKEMA laboratory through all types of tests, the experiment Room that this result has to break the world record voltage and capacity levels. December 17, 2015, the world's highest voltage level, the largest transmission capacity of bipolar flexible DC transmission project - Xiamen ± 320 kV / 1 million kilowatts of flexible DC transmission technology demonstration project put into operation. November 6, 2016, Xuji Group independently developed Zhoushan flexible DC 200 kV high voltage DC circuit breakers in the Global Energy Internet Institute of Power Electronics Laboratory successfully passed all types of tests, test items and test parameters in full compliance with national standards and IEC standards, the technical indicators have reached the international advanced level. Flexible DC to promote technology, equipment, continuous innovation and development There is no fast breaking DC current equipment, soft project has always been hidden hidden dangers High-power DC transmission is different from the current AC transmission, continuous current and voltage, equivalent to high-speed Mercedes-Benz high-speed rail, huge energy. In order to ensure the safe operation of the equipment and the safe operation of the system, the DC circuit breaker is required to cut off the fault current within 3 milliseconds and isolate the fault point, which is equivalent to putting a train of high-speed Mercedes-Benz at a few milliseconds Of the time to stop, great difficulty, the existing breaking technology can not meet the requirements. How to solve the problem of high-power DC breaking, long troubling the domestic and international academia, it is known as the century-old power technology problems.
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