说明：  PSCAD/EMTDC（ElectroMagnetic Transient in DC System，直流电磁暂态计算程序）是目前世界上广泛使用的一种离线仿真电力系统分析软件，是分析和研究直流输电系统和交直流相互影响等问题的有力工具。
(PSCAD/EMTDC (ElectroMagnetic Transient in DC System, DC electromagnetic transient computer program) is the world' s a widely used off-line simulation of power system analysis software, is the analysis and study of DC and AC-DC transmission system issues such as the strong interaction tool.)