载波移相 SPWM 在贯通式同相供电系统中的应用

Application of Carrier Phase Shifted － SPWM to Continuous Co － phase Power Supply System

摘要:

针对贯通式同相供电系统中的交 － 直 － 交变流器输出电流( 电压) 谐波畸变率( total harmonic distortion， THD) 较高的问题，提出采用载波移相正弦波脉宽调制( sinusoidal pulse width modulation，SPWM) 方法，将多个单相逆 变器级联输出，以此改善输出电压波形。在 Matlab /Simulink 中建立系统模型进行仿真测试，结果表明，所提方法能够 有效改善牵引供电系统电能质量问题，使牵引侧负载电压 THD 含量减少、电力电子器件耐压水平降低。

Abstract:

In order to solve the problem that the harmonic content in output current ( voltage) of AC － DC － AC converter is higher，carried phase shifted － sinusoidal pulse width modulation ( CPS － SPWM) method is proposed to improve the output voltage waveform by taking cascade multiple single － phase inverter as output device． Then，the simulation model is established in Matlab /Simulink． The simulation results show that the proposed CPS － SPWM can improve the power quality of traction power supply system efficiently，reduce the THD content of load voltage，and lower the peak voltage of power electronic devices．