three-phase ac voltage

The traction inverter provides VVVF three-phase ac voltage for traction motors.

牵引逆变器为牵引电机提供三相变频、变压的交流电。

The shift trigger pulse of the thyristor trigger circuit with integration amplifier is generated by comparing directly principle of three-phase AC and shift-phase control voltage.

该晶闸管触发器采用集成运数放大器，移相触发脉冲的形成是根据三相交流电的各相与移相控制电压直接比较原理实现的。

Subsequently, a novel controller for DC bus voltage regulation is put forward according to the small signal model based on the instantaneous power balance in AC and DC sides of three-phase SAPF.

然后根据交流侧和直流侧的功率平衡方程，推导了电压环的小信号模型。最后基于该模型设计了一种高动态性能的直流电压调节器。