基于空间矢量调制的VIENNA型三相三电平整流器设计

Design of Three-Phase Three-level VIENNA-type Rectifier Module Based on Space Vector Modulation

本文使用空间矢量调制对VIENNA型三相三电平整流器进行控制,通过分析空间矢量调制基础矢量对整流器输出电压中点的影响,得出可以引入了小矢量作用系数对中线电流进行补偿,减小中点电压的周期性波动。为了验证设计的有效性,本文使用MATLAB中的Simulink仿真环境搭建了电路和控制系统进行仿真。仿真结果表明:通过空间矢量调制可以使VIENNA整流器获得正弦化的三相输入电流和直流输出,增加中点电流补偿后,可以获得较小的中点电压波动,实现中点电压平衡。

This article applies space vector modulation on the VIENNA-type rectifier. The resultsof how the basevectors affect center point currentare analyzed in detail and a strategy that center point current can be compensated with areasonable working time modification of the small base vectors is put forward. Through the compensation, the capacitor ripplevoltage can be controlled in small scale and the output neutral-point voltage balancing can be achieved. A simulation setup usingMATLAB/Simulink is utilized to test the control strategy and the results verify this approach.