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为了进一步提高调速系统的容量,降低输出谐波和转矩脉动,将多电平逆变器与多相电机相结合,给出了五级十一电平级联型多电平逆变器驱动双Y移30°永磁同步电机的六相调速系统拓扑结构,分析了电压空间矢量在各正交空间的分布,研究了基于双级联型逆变器的四矢量空间矢量脉宽调制(SVPWM)算法。基于Matlab的仿真将级联型多电平逆变器驱动的双Y移30°永磁同步电机矢量控制系统与两电平逆变器驱动的双Y移30°永磁同步电机矢量控制系统进行比较,前者的转矩、稳态电流等性能均优于后者,其稳态电流总谐波畸变率仅为2.68%。基于DSP的实验表明级联型多电平逆变器输出波形接近正弦波,转矩脉动较小,稳态电流谐波含量低,达到了预期的控制效果,从而验证了本文所提方法的可行性。
In order to further improve the capacity of the speed governing system and reduce the output harmonics and torque ripple, the multi-level inverter is combined with the multi-phase motor to provide five eleven-level cascaded multilevel inverters The topology structure of six-phase speed control system driven by double-Y shift 30 ° permanent magnet synchronous motor is analyzed. The distribution of voltage space vector in each orthogonal space is analyzed. The four-vector space vector pulse width modulation (SVPWM) algorithm. Based on the Matlab simulation, the cascaded multi-level inverter driven double-Y shift 30 ° permanent-magnet synchronous motor vector control system and the two-level inverter driven double Y shift 30 ° permanent magnet synchronous motor vector control system Compared with the former, the torque and steady current of the former are better than the latter, and the total harmonic distortion of steady current is only 2.68%. Experiments based on DSP show that the cascaded multi-level inverter output waveform is close to the sine wave, the torque ripple is small, the steady-state current harmonic content is low, reaching the expected control effect, thus verifying the feasibility of the proposed method Sex.