基于恒定开关频率的12区段DTC系统的研究

传统的直接转矩控制方法将磁链控制为六边形或是6区间圆形,转矩的控制使用一个滞环比较器,这种方法会造成开关频率变化、转矩脉动过大。为解决这些问题,在传统直接转矩控制的基础上介绍一种改进方法,将传统6区间圆形磁链细分为12区间,并使用一种恒定开关频率控制器以取代转矩滞环比较器,来解决传统6区间磁链以及转矩滞环比较器存在的缺陷。仿真结果表明,该方法能保持开关频率恒定,并能有效地减小转矩脉动。

Analysis of Twelve-section DTC System Based on Constant Switching Frequency

Traditional direct torque control methods keep the flux linkage range hexagonal or six-section rotundity and use a torque hysteresis comparator,which will cause the variation of switching frequency and the high torque ripple.To solve these problems,an improved method based on traditional direct torque control was introduced.In order to overcome the shortcomings of traditional control methods,the traditional six-section round flux is subdivided into twelve,and a constant switching frequency torque controller is used to replace the conventional hysteresis-based controller.Simulation results show that the method can maintain a constant switching frequency and reduce the torque ripple effectively.