基于PWM逆变器的船舶变压器励磁涌流消除方法

Eliminating Inrush Current of Transformer in Marine Power System Based on PWM Inverter

文章提出了一种消除船舶电力系统中变压器空载合闸过程产生励磁涌流的方法。该方法通过在变压器二次侧接入小容量的电压源逆变器,通过锁相环调节逆变器输出电压,使变压器一次侧绕组输出电压与电网电压的频率、幅值和相位同步,经过预充磁与预同步之后,再使变压器合闸消除励磁涌流。仿真和试验结果验证了所提出的方法能够有效地消除励磁涌流的产生。

The paper proposes a novel method to eliminate the inrush current of transformer in marine power system. A small-rated voltage-source converter（VSC） is connected to the secondary windings of transformer, and the output voltage of VSC is increased gradually from 0 to the rated voltage of secondary windings. The voltages of grid and the primary output of transformer are measured, and the pre-synchronization is completed including amplitude, phase and frequency. Since the transformer is pre-magnetized and pre-synchronized, no inrush phenomenon occurs during the transformer is being switched. The simulation and experimental results demonstrate that the proposed method can perfectly eliminate the inrush phenomena.