三电平逆变器输出电压波形比两电平逆变器增加一个台阶,其谐波含量低、波形质量好,有利于实现输出电压的正弦化,且单个开关管承受的电压应力小,适合向高压大容量方向发展。内置式永磁同步电机(IPMSM)为三相正弦波输入控制,用三电平逆变器来驱动IPMSM,有利于减少IPMSM的转矩脉动,实现高性能的调速控制。对基于三电平逆变器的IPMSM矢量控制技术进行了研究,建立了系统仿真模型。仿真结果表明:该系统的三电平逆变器输出电压波形正确,IPMSM的转速能准确跟踪参考转速,电机动态、稳态性能良好。

The threelevel inverter’s voltage output had one more step than twolevel inverter so that it had lower harmonics. Thus, the output waveform of threelevel inverter was better and was more suitable to realize sine wave. Moreover, each power device’s voltage stress of threelevel inverter was smaller than that of twolevel inverter. Then threelevel inverter was more fit for high voltage and large power volume converter development. Interior permanent magnet synchronous motor (IPMSM) was controlled with threephase sine wave input. Using threelevel inverter to drive IPMSM had such clear advantages as decreasing torque pulsation and easy to realize excellent speed modulation performance. The research of IPMSM vector control based on threelevel inverter was carried out. The simulation model of the whole system was built. Simulation results proved that the threelevel inverter voltage output was correct, IPMSM speed could follow the reference speed closely, and the dynamic and static responses were good.

TM 351