基于二阶滑模算法的永磁电机直接转矩控制

Direct Torque Control of Permanent Magnet Motor Based on Second Order Sliding Mode Algorithm

针对传统直接转矩控制(DTC)方法低速控制精度差、转矩脉动大、开关频率不稳定等问题,提出了一种基于二阶滑模控制的永磁电机DTC方法。该控制方法基于二阶滑模控制原理,将传统磁链控制器与转矩控制器以滑模控制器替代,对空间电压进行矢量调制,提高了开关频率的稳定性,获得了良好的动态稳定性,改善了电机输出性能。仿真与试验结果表明,该控制方法能够有效减小电流脉动与转矩脉动,同时提高了控制系统的抗干扰能力,实现了电机的快速动态响应,具有较强的鲁棒性能。

Aiming at the problems of low precision control accuracy,large torque ripple and unstable switching frequency in traditional direct torque control(DTC)method,a DTC method based on second order sliding mode control for permanent magnet motor was proposed.Based on the second order sliding mode control principle,traditional flux controller and torque controller were replaced by sliding mode controller.Vector-modulating method was used to modulate the space voltage and the stability of switching frequency was improved.Also,dynamic and output performances of motor were improved.The simulation and experimental results showed that the control method could effectively reduce the current ripple and torque ripple.The anti-interference ability of control system was enhanced.The fast dynamic response and strong robust performance of motor were realized.