基于自适应二阶终端滑模的SRM直接转矩控制

传统的直接转矩控制（DTC）可以在一定程度上减小开关磁阻电机（SRM）的转矩脉动，但是在换相区的转矩脉动抑制效果较差，并且传统的PI控制存在超调量大、鲁棒性差、抗负载扰动能力有限的缺点。因此，设计了基于负载转矩变化率自适应估计的二阶终端滑模转速控制器，在有限时间内使得系统状态迅速收敛到平衡点，实现无需已知扰动上界快速输出给定转矩。此外，对传统的扇区规则进行改进以优化电压矢量的选取，减少由于换相产生的转矩脉动。仿真和实验结果表明：改进后的DTC系统拥有良好的调速控制性能，抗干扰能力强，鲁棒性好，能进一步减少转矩脉动。

Direct torque control of switched reluctance motor based on adaptive second-order terminal sliding mode

The torque ripple of switched reluctance motor (SRM) can be reduced to some extent by traditional direct torque control (DTC), but the torque ripple suppression effect is poor in the commutation zone. And the traditional PI control has disadvantages of large overshoot, poor robustness and limited anti-disturbance ability. Therefore, a second-order terminal sliding speed controller based on adaptive estimation of load torque change rate was designed, which made the state of the system quickly converge to the equilibrium point within a finite time. The controller will output the reference torque without the upper bound of the perturbation. In addition, an improved sector segmentation method was used to optimize the voltage vector selection principle in order to reduce the torque ripple which resulted from the commutation. The simulation and experimental results show that the improved DTC system has good speed and control characteristics, strong anti-interference capability and good robustness, which can further reduce the torque ripple.