| 摘 要： | The ±800 kV ultra high voltage direct current(UHVDC) transmission system is an extraordinary challenge to system design and equipment manufacture.China Southern Power Grid Company(CSG) organized research and design for the construction of Yunnan-Guangdong ±800 kV UHVDC project(YG UHVDC project),and got large technical breakthroughs and advanced technologies for ±800 kV UHVDC transmission systems.These advanced technologies include power system stability,main electrical wiring,overvoltage and insulation coordination,external insulation,electromagnetic environment,control and protection,and arrangement of the main equipments.Meanwhile,CSG led the researches on specification of main equipments,such as converter valve,converter transformer,dry-type smooth reactor and others involved in the whole process management of equipment supervisions.The YG UHVDC project was put into commercial operation in 2010 as the first pilot ±800 kV UHVDC project in the world.The whole system operated in a stable and smooth manner,and the UHVDC equipment and control systems passed the test under the practical operation in CSG bulk power system,which shows that the design and research objectives were achieved.
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