英语语法分析

The HVDC transmission system may lead to subsynchronous oscillation under certain circumstances.

高压直流输电系统在一定条件下可能引发系统的次同步振荡。

Using the test signal method, a detailed analysis of subsynchronous oscillation for a HVDC system is performed.

对一个仅含有直流输电线路的系统，采用复转矩系数——测试信号法，对其次同步振荡特性进行了分析。

Through studying, the mechanism of the subsynchronous torsion oscillation caused by the controller of HVDC system has been understood.

对该问题的研究解释了由高压直流输电系统控制器诱发汽轮发电机组轴系扭振的机理。