基于反推控制的机械弹性储能永磁同步电机最大转矩电流比控制

与id=0控制相比,同等容量下最大转矩电流比控制可使永磁同步电机输出更大的低速转矩,动态性能也更优,适合于作为机械弹性储能系统驱动控制。提出一种基于反推控制的永磁同步电机最大转矩电流比控制方法,运用极值原理建立最大转矩电流比控制下最小d、q轴电流关系式,利用带遗忘因子的最小二乘算法辨识同时变化的涡簧负载转矩和转动惯量,在此基础上,设计速度反推控制器和电流反推控制器分别取代传统速度PI控制器和电流PI控制器,并从理论上证明了控制算法的稳定性。实验结果表明,最大转矩下该方法比基于反推的id=0控制需要的定子电流更小,而与基于PI的最大转矩电流比控制相比,具有跟踪参考信号迅速、动态性能好、参数调整少的优点。

Backstepping Control Based Maximum Torque Per Ampere Control of Permanent Magnet Synchronous Motor for Mechanical Elastic Energy Storage

In contrast with id=0 control, maximum torque per ampere control enables permanent magnet synchronous motor to output a larger low-speed torque and has a better dynamic performance under equivalent capacity. It is extremely suitable as the drive control for mechanical elastic energy storage system. A backstepping control based maximum torque per ampere control approach is proposed for permanent magnet synchronous motor. The relation equation of minimum d-axis and q-axis currents in maximum torque per ampere control is constructed through extremum principle. Simultaneous variations of torque and inertia for spiral torsion spring load are estimated through least square algorithm with forgetting factor. Conventional PI controllers of speed and current are replaced by designed backstepping controllers of speed and current respectively, and the stability of the proposed algorithm is proved in theory. Experimental results indicate that the proposed approach requires less stator current in comparison with backstepping based id=0 control. Additionally, the approach has the advantages of prompt tracking reference signals, good dynamic performance and fewer parameters adjustment.