On May 7, the annual maintenance work of ±800 kV Lushan Converter Station of State Grid Hunan Electric Power Co., Ltd. was in full swing. The valve cooling system and the camera water cooling system developed by the company apply new water purification materials, water quality lean control devices and corrosion protection technology systems. The system has been operating stably for nearly one year, effectively guaranteeing the constant temperature of the converter valve and the dual water cooling camera. Control, marking the successful application of the key technology of UHV water cooling, the breakthrough in the research of this technology. In 2013, the State Grid Hunan Electric Power Company found during the inspection of the ±500 kV Goose City Converter Station that the key materials in the valve cooling system are easily deteriorated, the water-cooled medium is not finely controlled, and the metal corrosion and scaling are high-voltage DC. Important safety hazards in the operation of transmission equipment. The company, in conjunction with the Chinese Academy of Sciences, formed a technical research team to carry out research on the reliability improvement system of the water cooling system. The research team relies on the research project of “Key Technology and Engineering Application of High Power Power Electronic Water Cooling Equipmentâ€, and conducts research on antifouling treatment, insulation technology, metal materials, rapid assessment, etc., after numerous comparisons between laboratory and site. The test successfully mastered key technologies such as deep water treatment, equipment corrosion monitoring, metal bionic hydrophobic anticorrosion, and successfully developed into a complete water cooling system for new high-power power electronic equipment. The system develops a series of new water purification materials to increase the filtration efficiency of hydrophilic antifouling membrane by 1 time, increase the antifouling ability by 2 times, and increase the operating period of large capacity ion exchange materials by 1 time; carry out full performance, simulation acceleration test and optimization of manufacturing process Develop a water distribution device with excellent weather resistance; reveal the micro-reaction mechanism of water-cooling medium and metal in the converter valve, and propose the core index of water quality lean control; develop a multi-stage deep treatment series device to achieve water quality compliance and long-term stability, and leakage current is better than Conventional technology is reduced by more than 50%; a dynamic monitoring method based on frequency modulation is proposed, and special sensors and on-line monitoring devices are developed to ensure that the data acquisition interval is less than 500 seconds and the error is less than 5%; the first interface enhanced marine biomimetic hydrophobic anti-corrosion Technology, metal corrosion rate decreased by 96%, anti-corrosion film stability time exceeded 2 years; self-built machine, electricity, liquid and heat multi-source fusion simulation platform to achieve rapid evaluation of materials, devices and system performance, new product design and manufacturing cycle reduction 2 /3; Development of high-power power electronic equipment engineering applications and scientific research series of water System. It is reported that compared with ABB, Siemens and other foreign manufacturers water cooling system, the technical parameters are fully dominant. It has been authorized to have 15 national invention patents, 6 software copyrights, and published more than 20 papers, including 9 SCI/EI papers. Prepare 1 standard and publish 1 monograph. The project has been certified by an authoritative organization and successfully applied to important projects such as UHV DC, Miracle of Brazil, and flexible DC in Xiamen, and expanded to nuclear power, high-speed rail, petrochemical and other fields; safe production of power grids, efficient use of clean energy, and environmental reduction. Pollution is of great significance, and economic, social and ecological benefits are significant.
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