SVPWM Control of Three Level Inverter for Traction Drive in EMUs
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摘要: 提出了适用于高速动车组牵引传动中三电平逆变器控制的空间矢量脉宽调制(SVPWM)控制策略.动车组起动和低速阶段要求转矩脉动小,采用恒定最大开关频率控制的三电平异步调制策略;高速时,要求逆变器在低开关频率下的良好谐波性能,在中高速和高速分别采用4脉冲和2脉冲同步调制策略.仿真结果与实测动车组牵引电机电压波形进行了对比,证实了SVPWM控制策略的有效性.Abstract: Space vector pulse-width modulation(SVPWM) control strategies were proposed for three level inverters of traction drives in high-speed EMUs(electrical multiple units).A constant-maximum-switching-frequency asynchronous modulation control strategy is applied during starting and low-speed periods of the EMU’s motor because low torque ripples are required during these periods.At high-speed,because low-switching-frequency and low-harmonic component are required,a variable-switching-frequency synchronous modulation control strategy is used with a 4-pulse modulation at mid-high speed and a 2-pulse modulation at top-high speed respectively.The effectiveness of the proposed strategies were verified by comparing the simulation voltage waveforms with the measured data of the EMU’s motor.
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