模块化多电平变频驱动系统的转矩脉动最小化控制

应用基于两电平变频器的传统感应电机驱动系统存在输出转矩脉动较大的问题。针对这个问题,设计了一种模块化多电平变频器驱动的多极感应电机转矩脉动最小化控制方案。基于多极感应电机设计了其多电平驱动变频器拓扑,并采用了一种单极性的载波移相空间矢量脉宽调制技术进行控制。通过脉冲序列生成分析和计算,系统的低次输出谐波都达到了开关频率的四倍频以上,进而有效降低了转矩脉动。基于模块化多电平变频器的多级感应电机驱动试验平台进行了对比试验研究,试验结果验证了在新型控制策略下的有效性,电机转矩脉动得到了明显改善。

Torque Ripple Minimization Control for Modular MultilevelConverter Driven System

The conventional induction motor driven system which was equipped with twolevel converter had the problem of large torque ripples. Aiming at it, a torque ripple minimization control for multipole induction motor driven by modular multilevel converter was proposed. The modular multilevel drive converter topology was designed based on the multipole induction motor, and a unipolar carrier phase shifted SVPWM technique was adopted for the controller. Through the analysis and calculation of pulse sequence generation, all low order harmonics achieve four fold frequency of switching frequency, and then minimize the torque ripples. The experimental research had been carried out based on multipole induction motor drive test platform with modular multilevel converter. The test results verified the effectiveness of the new control strategy, and the torque ripple of the motor was improved obviously.