By designing the train-server-monitoring three-terminal mode the system can monitor several trains at the same time .

此外 系统采用了车载-服务器-远程监控终端的 三 端模式，实现了对多辆列车的同时监控。

Based on the operating principle of MMC a mathematical switching model applied to the transient analysis of MMC and a mathematical model under dq coordinates of the three-terminal MMC-MTDC system which is suitable for control analysis are derived .

基于MMC的运行工作原理，推导了适用于暂态分析的MMC的开关函数数学模型以及适用于控制分析的 三 端 MMC-MTDC 系统dq坐标下的数学模型。

Both of the theoretical analysis and simulations are carried out in three-terminal relay system and multi-relay system .

最后在传统的 三节点 系统和多中继节点系统中，对AF、DF和 NAF的性能进行了理论分析和仿真。