| Citation: | LIU Yongzhi, SHAN Chenglong, LIN Bowen, et al. Direct torque control of switched reluctance motor based on adaptive second-order terminal sliding mode[J]. Journal of Beijing University of Aeronautics and Astronautics, 2018, 44(10): 2043-2051. doi: 10.13700/j.bh.1001-5965.2017.0781(in Chinese)
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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.
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