基于三电平逆变器的内置式永磁同步电机矢量控制研究

Research on Vector Control of Interior Permanent Magnet Synchronous Motor Based on Three-Level Inverter

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 three-level inverter’s voltage output had one more step than two-level inverter so that it had lower harmonics.Thus,the output waveform of three-level inverter was better and was more suitable to realize sine wave.Moreover,each power device’s voltage stress of three-level inverter was smaller than that of two-level inverter.Then three-level inverter was more fit for high voltage and large power volume converter development.Interior permanent magnet synchronous motor (IPMSM) was controlled with three-phase sine wave input.Using three-level 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 three-level inverter was carried out.The simulation model of the whole system was built.Simulation results proved that the three-level inverter voltage output was correct,IPMSM speed could follow the reference speed closely,and the dynamic and static responses were good.