基于负载转矩观测的PMSM直接转矩反步控制

Direct Torque Control with Backstepping Approach of PMSM Based on Load Torque Observer

基于永磁同步电机数学模型,考虑永磁同步电机的非线性特性,提出了一种新颖的反步法控制策略设计转矩和磁链非线性控制器,使电机具有快速的速度和转矩响应性能,并且能有效减小转矩和电流脉动。针对负载转矩扰动的问题,设计了负载转矩Luenberger状态观测器以减小扰动对系统的影响,并采用线性矩阵不等式对反馈增益进行求解。通过仿真可以看出,所设计的控制器使系统具有良好的动静态特性,负载转矩观测器能准确估计负载变化,使系统对负载扰动具有较强的鲁棒性。

Based on the mathematical model of permanent magnet synchronous motor （PMSM）, considering the nonlinear characteristics of PMSM, a novel backstepping control strategy was proposed for designing the nonlinear controller of the torque and flux linkage. As a result, the motor has fast response performance for speed and torque, and can reduce the torque and current ripples effectively. In order to solve the problem of load torque disturbance, a l^uenberger state observer of load torque was designed. Furthermore, the feedback gain was obtained through solving the linear matrix inequality （LMI）.The simulation results show that the system has satisfactory dynamic and static performance, the observer can estimate the change of load torque accurately, hence enhance system robustness.