基于扰动观测器的反推控制在磁轴承中的应用

Application of Backstepping Control Based on Disturbance Observer in Magnetic Bearing

针对磁轴承转子系统在运行时因转子质量不平衡导致的同频扰动问题,提出了将反推控制算法和扰动观测器相结合形成一个复合控制器的控制策略。对磁轴承转子系统中的同频信号进行观测,并在输入信号中对同频扰动信号进行抑制。建立了转子动力学模型,设计了反推控制器和扰动观测器,通过MATLAB仿真,结果表明:该复合控制器比反推控制器对扰动信号的抑制能力更强,抑制效果更好,且复合控制器对转子从零转速上升到额定转速再下降到零转速的全过程均具有较好的扰动抑制能力,提升了系统的抗干扰性。

Aimed at the problem of same frequency disturbance caused by unbalance of rotor mass during operation of rotor system of magnetic bearing,a compound control strategy combining backstepping control algorithm and disturbance observer is proposed to form a compound controller.The same frequency signal in rotor system of magnetic bearing is observed,and the same frequency disturbance signal is suppressed in input signal.The dynamic model of rotor is established,and the backstepping controller and disturbance observer are designed.Through MATLAB simulation,the results show that:compound controller has stronger suppression ability and better suppression effect than backstepping controller,and compound controller has better disturbance suppression ability in whole process of rotor from zero speed up to rated speed and then down to zero speed,and the anti-interference performance of system is improved.