四逆变器并联磁悬浮列车牵引系统的谐波抑制

Harmonics Reduction Research on Parallel-Connected Four Inverters for Maglev Train Drive System

本文提出基于载波移相叠加的四逆变器并联系统作为磁悬浮列车牵引系统拓扑,采用载波移相控制技术,各逆变器通过电抗器连接,以满足磁悬浮列车低速运行阶段直线同步牵引电机起动电流大、电压相对较低的要求,载波相位依次相差π/2,与载波同相四逆变器并联系统相比,牵引系统谐波含量显著降低。同时提出一种新的频域谐波分析方法,给出了谐波幅值与调制比之间的定量关系。仿真结果表明该方案的可行性及分析方法的正确性。

The four inverters parallel connection based on carrier phase shift（IPC-CPS） is proposed in this paper.In this way,the comparatively low voltage and large current of the linear synchronous motor for drive system are satisfied,when the maglev train at the starting stage.The inverters are connected by inductors.The carrier phase shift technique is adopted,and carrier phase differentiates π/2 from each other.The harmonic components are reduced greatly comparing to the traditional four parallel connection inverters with same carrier phase.This paper makes theoretical harmonic analysis by a new frequency domain mathematical method.The quantitative relationship between fundamental magnitude,harmonics magnitude and modulation factor is given.The simulation shows the feasibility of the proposed control scheme and analysis method.