基于降阶负载转矩观测器的永磁同步电机广义预测控制

Generalized Predictive Control with Reduced Order Load Torque Observer for Permanent Magnet Synchronous Motor

针对永磁同步电机(PMSM)转速控制,提出了一种基于降阶负载转矩观测器的非线性预测控制(NPC)策略。在速度环控制律中负载转矩通常作为扰动值来考虑,将降阶负载转矩观测器与广义预测控制相结合,利用得到的转矩估计值代替实际值。仿真试验结果表明,所提控制策略能有效实现转速跟踪,与传统PI控制相比,趋于稳定的时间短、超调量小、抗干扰能力强、转速环控制的鲁棒性较高。

Aiming at the speed control of permanent magnet synchronous motor(PMSM),a nonlinear predictive control(NPC)strategy based on reduced order load torque observer is proposed.In the speed loop control law,the load torque is considered as the disturbance value.The reduced order load torque observer is combined with the generalized predictive control strategy.The estimated torque value is used to replace the actual value.Simulation and experimental results show that the control strategy proposed can effectively achieve speed tracking.Compared with the traditional PI control,the overshoot is smaller,the speed approaching to stability is faster,the anti-interference ability is stronger,and the robustness of the speed loop is higher.