柔性直流是采用全控型功率器件和模块化拓扑结构的新一代直流输电技术，可控性高、适应性好，可实现有功和无功独立解耦的全域运行。
VSC-HVDC is a new generation of DC transmission technology that adopts fully-controlled power devices and modularized topology,
with high controllability,and can realize four quadrants operation with decoupling control of active and reactive power.
除了输电外，柔性直流能否部分取代交流系统元件的功能，例如“交流联络线模拟”?“虚拟电磁环网”?“直流电厂”?这是本报告主要讨论的问题之一。
In addition to transmission,can VSC-HVDC partially replace the functions of AC system components,such as “AC line emulation”,”Virtual
electromagnetic loop”,”DC power station”?These are the main questions that will be discussed in this report.
柔性直流技术已成为全球关注热点和发展趋势
VSC-HVDC technology has become a global concern and development trend
-已运行的直流工程，传统直流占大多数、达到70%,柔性直流占21%
– LCC accounts for the majority (70%)of the HVDC projects in operation,and VSC-HVDC accounts for 21%.
-规划中的直流工程，柔性直流成为主流方案，规划数量是传统直流的2倍
Among planned HVDC projects,VSC-HVDC has become the mainstream,twice of conventional LCC
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