HVDC transmission equipment development prospects
System research and complete set design and manufacture of DC transmission equipment in China have a good foundation. In the short-term, the research and complete set of design and manufacture of DC transmission systems have basically achieved independent development and development, and are quickly among the best in the world. At present, the units engaged in the research and complete design of DC transmission systems in the country are: Beijing Net-Link DC Engineering Co., Ltd., which mainly undertakes the tasks of the HVDC transmission project of the State Grid Corporation of China; China Southern Power Grid Corporation's technology research center mainly undertakes the HVDC transmission projects undertaken by China Southern Power Grid Corporation. Engineering missions; Westcom conducted joint research projects and complete sets of design tasks for ±500 kV and ±800 kV DC transmission projects with Beijing Net-Link DC Engineering Company and China Southern Power Grid Corporation Technical Research Center respectively. The main development and research and development with the combination of technology introduction, and strive to quickly implement a comprehensive localization. Currently, the units that manufacture DC valve devices in China mainly include: Xi'an West Electric Power Rectifier Co., Ltd., Xu Ji Flexible Transmission System Co., Ltd., and the China Electric Power Research Institute recently involved, among which the Xi'an West Electric Power Rectifier Co., Ltd. has Provides converter valve equipment for the DC field of domestic DC transmission projects. Xi'an Xidian Transformer Co., Ltd., TBEA Shenyang Transformer Group Co., Ltd. and Baoding Tianwei Baochang Electric Co., Ltd. provided main equipment such as converter transformers. Nan Rui Ji Bao Electric Co., Ltd., Xu Ji Electric Co., Ltd. and other units provide control and protection equipment for domestic HVDC transmission projects. There are domestic DC equipment manufacturers that provide surge arresters, flat-wave reactors, AC filters, and DC switches. Among them, subordinate enterprises of Xidian Group have system research and complete design capabilities for DC transmission projects, and have DC converters, converter transformers, smoothing reactors, filters, DC switches, surge arresters and other DC complete sets of equipment manufacturing enterprises and high-voltage DC The transmission equipment test laboratory has the overall technical strength ranking first in China and represents the research and development level of domestic HVDC transmission equipment. The domestic power transmission and transformation equipment manufacturing industry has played an important role in the promotion and localization of DC transmission technology in China. At present, domestic HVDC transmission equipment is moving in the direction of quickly achieving independent design and developing and developing domestically-advanced complete sets of HVDC transmission equipment. As mentioned before, the uniqueness of the distribution of primary energy resources and power load in China has become an inevitable necessity for the development of long-distance and large-capacity power transmission. Especially for long-distance transmission lines over 600 km in length, ultra-high voltage and ultra-high voltage direct current (UHVDC) transmission are used to save energy, reduce consumption, improve economic efficiency, and achieve reasonable development and optimal allocation of energy resources in a wider range, which is in line with China’s “Eastern Send "national conditions. The development of ultra-high and ultra-high voltage direct current (HVDC) transmission is an important national policy for the development of electricity in China. Its DC transmission equipment is listed as one of China's major equipment for development during the “11th Five-year Plan” and beyond. State Grid Corporation of China and China Southern Power Grid Co., Ltd. have drafted development plans for the near and long-term HVDC transmission projects. So far, there are a total of 10 high-voltage and ultra-high-voltage direct current transmission lines that have been built and put into operation in China, including 3 ± 100 kV and ± 500 kV. Six super and ultra-high voltage direct current projects currently under construction: Yunnan-Guangdong ±800 kV DC project (2006-2010), Xiangjiaba-Shanghai ±800 kV DC project (2007-2011), Jinping-Su South ±800 kV DC Project (2007-2011), Deyang-Baoji ±500 kV DC Project (2007-2011), Deyang-Baoji ±500 kV DC Project (2008-2011), Hohhot-Liaoning ±500 kV DC Engineering (2008-2011). In the next 10 years, a number of ultra-high voltage and ultra-high voltage direct current projects will also be constructed, of which the focus is on the ±800 kV UHV DC transmission project.