The world's highest voltage level and largest capacity flexible DC transmission project - Yunnan Power Grid and China Southern Power Grid main network Luxi back-to-back DC asynchronous networking project flexible DC unit was completed and officially put into operation. The project is located in Luxi Village, Luoping County, Qujing City, Yunnan Province. It is the world's first large-capacity flexible DC and conventional DC combination mode. The three 500kV AC lines connected to the main grid of Yunnan Power Grid and the South China Power Grid are converted to DC and then DC. Change the exchange to realize the asynchronous networking of Yunnan Power Grid and China Southern Power Grid main network. It can effectively solve the grid safety problem caused by AC/DC power transfer, avoid the risk of large-scale power outage, and effectively improve the capacity of Yunnan hydropower transmission, and realize the reasonable consumption of surplus power in Yunnan Fengshui period.
In this project, the Institute of Electrical Engineering of the Chinese Academy of Sciences and the China Xidian Group are responsible for the research and development of the ±350kV/1000MW converter valve and its control and protection system on the Guangxi side. The converter uses a modular multilevel converter (ModularMulTIlevel Converter, MMC). The topology consists of more than 2,800 power modules (more than 5,600 power electronic switching devices) and other components. It is the single power electronic converter device with the highest voltage, largest capacity and most complicated circuit topology in the world.
The Guangxi side ±350kV/1000MW converter system developed by the Institute of Electrical Engineering of the Chinese Academy of Sciences and China Xidian Group has complex structure, short control and protection period (about 100μs), protective electric quantity (thousands), high reliability requirements, and commutation The hardware and control algorithms of the control system are a huge challenge. Based on years of technology accumulation in the fields of high-voltage high-power power electronics and flexible DC transmission, the Institute of Electrical Engineering completed the world's first multi-terminal flexible DC transmission project in December 2013 – the Guangdong Nanao three-terminal flexible DC transmission project Qingkan station converter and On the basis of the control and protection system, it has broken through many core key technologies such as large-scale real-time control platform, rapid voltage sequencing control, low-loss operation control, etc., applied for and obtained 16 national invention patents, and successfully developed a completely independent intellectual property right. The high-performance flexible DC converter high-performance control and protection hardware and software system (MMCon-G4) ensures the smooth implementation of the project and system performance.
As a special research institute of the Chinese Academy of Sciences in the field of energy, the Institute of Electrical and Mechanical Engineering, "The development and application of large-capacity flexible DC transmission converters" is one of the key projects promoted by the Institute of Electrical Engineering. The construction and successful operation of the project will be further enhanced. The characteristics and core competitiveness of the electrician in the energy and electrical fields. In the future, the Institute of Electrical and Mechanical Engineering will continue to focus on the goals set by the pilot program of the Energy Sector Research Institute, adhere to the “three orientations, four firstsâ€, and closely focus on the national demand for national renewable energy, smart grid and energy conservation, and continuously optimize Scientific research layout, and strive to make greater achievements in major key technology breakthroughs, system integration innovation and original innovation.
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