基于磁场定向的矩阵变换器驱动感应电机变结构直接转矩控制

Variable-structure Direct Torque Control for Induction Motor Driven by a Matrix Converter Based on Field Oriented

提出一种新型的基于磁场定向的矩阵变换器驱动感应电机直接转矩控制方法,将滑模变结构控制策略引入矩阵变换器驱动感应电机直接转矩控制中,以代替传统方法中的转矩和磁链滞环比较器,并结合矩阵变换器空间矢量调制方法,实现矩阵变换器开关频率恒定。实验结果表明,通过使用转矩和定子磁链2个滑模变结构控制器并结合矩阵变换器直接空间矢量调制,既可以保留传统矩阵变换器驱动感应电机直接转矩控制转矩快速响应的特点,又可以保证开关频率恒定和减小转矩脉动,有效地改善了系统的动静态性能。

This paper presents a new direct torque controlled space vector modulation method to improve the performance of induction motor driven by a matrix converter using variable-structure sliding mode scheme based on field oriented,which replace the traditional method of torque and flux hysteresis comparators,to implement the constant switching frequency of matrix converter combining the space vector modulation. The experimental results show that through the use of torque and stator flux controllers based on variable-structure scheme can not only retain the fast torque response characteristics of traditional direct torque control of induction motor driven by matrix converter,and also can guarantee constant switching frequency and reduce the torque ripples,effectively improve the static and dynamic performance of the system.