China's flexible DC core equipment and technology has reached the international advanced level

On March 5, the National Energy Administration hosted a 100 MW / ± 320 kV flexible DC converter valve jointly developed by State Grid Smart Grid Research Institute and Liaoning Provincial Electric Power Co., Ltd., as well as the technical appraisal of valve control equipment held in Beijing. Accreditation Committee agreed that the product performance is excellent, with completely independent intellectual property rights, the core technology and overall technical performance in the international advanced level, already have engineering application conditions, it is recommended to put into production as soon as possible. Flexible DC transmission is a new type of DC transmission technology with significant technical advantages. It has the advantages of small footprint, flexible control and environmental protection. It is one of the key technologies required for renewable energy development, marine economic development and green power grid construction , Is also one of the strategic commanding points in the field of DC transmission equipment competition. Inheriting the basis of experience Shanghai Nanhui wind farm demonstration project on HVDC flexible, relying on the country, the State Grid Corporation of major research projects and Dalian Gulf flexible DC transmission and electrical drive research team through thick and thin, they have worked hard to break through the converter valve much time Scale modeling, voltage balance control intelligent algorithm design and other top ten technical problems, made a number of original achievements, a complete set of design, integration and testing of the full set of technology. Since November 2012, the converter valve and valve control equipment have witnessed the DNVKEMA laboratory and lasted 3 months and completed all type tests including the four international standards of IEC62501-2009 and CIGRE447. The 1 million KW / ± 320 kV flexible DC converter valve successfully solved a series of problems under high voltage, high current and strong electromagnetic field conditions; the valve control equipment can meet the control requirements of complex targets; and put forward the modular multilevel converter valve Broadband full working conditions equivalent test method, completed the world's first set of full-power exchangeable shut-off valve device complete experimental device development; complete integration of flexible DC valve control equipment full-scale dynamic mode test platform to fill a number of international gaps . As one of the world's first high-end equipment of 1 million kilowatt-class flexible DC transmission, the 100 MW / ± 320 kV flexible DC converter valve and valve control equipment have promoted the development and application of flexible DC transmission technology, which has enabled China in the field of flexible DC high-end equipment Achieved from "tracking" to "lead" a huge leap forward. Next, State Grid Smart Grid Research Institute and Liaoning Provincial Electric Power Co., Ltd. will work together to speed up the pace of construction of large cross-sea flexible DC major demonstration projects in Dalian, and strive to complete the project as soon as possible in order to enhance the power supply reliability in Dalian and serve the development of China's smart grid. At the same time, accelerating the international operation will enable China's high-end electrician equipment to go abroad as soon as possible and comprehensively enhance China's international status in the field of HVDC transmission.