±800 kV直流输电系统的可靠性及其提高措施

±800 kV特高压直流输电系统是世界上电压等级最高的直流输电系统，承担着大容量、远距离输电和联网的任务，因此特高压直流输电系统的可靠性是系统安全运行的重要指标，通过对国内外已有常规直流输电系统可靠性数据的收集、整理，分析了特高压直流输电系统的可靠性，同时基于马尔可夫原理建立特高压直流系统的可靠性模型，通过软件进行分析计算，提出了±800kV直流输电系统的可靠性设计指标，并提出了一些改进措施以提高特高压直流输电系统的可靠性。

Study on Reliability of ±800 kV UHVDC Power Transmission and Its Improvement Measures

At present the ±800kV DC power transmission system is the DC power transmission system with the highest voltage class in the world, which bears the tasks of transmitting huge capacity of power in a long distance and interconnecting two UHVAC power grids, thus the reliability is an important index of secure operation of UHVDC power transmission system. By means of collecting and sorting out the reliability data of existing conventional UHVDC power transmission systems home and abroad, the reliability indices of these UHVDC systems are analyzed; at the same time, on the basis of Markov principle the reliability model for UHVDC system is established; after the calculation and analysis with software, the index for reliability design for ±800kV DC power transmission system is proposed and some measures to improve reliability of UHVDC system are put forward.