为解决上述缺陷和大功率可自关断器件的出现，出现一种全新的高压直流输电方式一柔性直流输电（Flexible HVDC）。柔性直流输电与传统直流输电相比较具有紧凑化、模块化设计和可以实现多端直流输电等优点。
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文章主要对柔性直流输电换流器的换流阀进行可靠性建模与分析。
The reliability model and analysis method of the converter valves in VSC-HVDC system is mainly concerned.
柔性直流输电利用电压源换流器的自换向特性使其具有诸多优点，研究其在城市电网中的应用具有重要意义。
Flexible DC power transmission has many advantages due to the use of voltage source converter's self-commutated characteristics.
基于常规直流及柔性直流的多端直流流输电系统和直流电网技术是解决这一问题的有效技术手段之一。
Thee multi-terminal DC transmission system and DC grid technology based on conventional DC and flexible DC are one of the effective technical means to solve this problem.
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