1·Control and protect section is the most pivotal section in HVDC system.
高压直流输电系统中最关键的部分是控制保护部分。
2·In view of harmonic which generated from the new-type HVDC analog system 12-pulse wave rectifiers and the inverter, designed passive filters system based on the new-type converter transformer.
针对新型高压直流输电模拟系统12脉波整流器与逆变器产生的谐波，设计了基于新型换流变压器的无源滤波器系统。
3·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。