基于NFOSM转速调节器的PMSM模型预测电流控制

Model Predictive Current Control for Permanent Magnet Synchronous Motor Drive System Based on NFOSM Speed

针对三相永磁同步电机(PMSM)驱动系统,结合分数阶理论和滑模控制理论,提出基于新型分数阶滑模(NFOSM)转速调节器的模型预测电流控制(MPCC)策略.基于NFOSM方法,设计了克服负载扰动及参数变化影响、增强系统鲁棒性的系统转速调节器;给出了减小定子电流脉动、提高系统控制精度的系统MPCC方法.NFOSM转速调节器能为系统提供更多控制余度,且可直接增加包含切换项的分数阶积分项,可有效消除抖振.仿真结果表明:与基于比例积分(PI)转速调节器和基于整数阶滑模(IOSM)转速调节器的PMSM MPCC相比,基于NFOSM转速调节器的PMSM MPCC系统具有更好的控制性能、更强的鲁棒性,而且能够消除系统抖振、减小系统三相电流THD值.仿真结果验证了设计系统的可行性和正确性.

A new fractional order sliding-mode （NFOSM）-based model predictive current control （MPCC） is developed for three-phase permanent magnet synchronous motor （PMSM） drive system. In order to overcome load disturbance and parameters variation,NFOSM-based speed regulator is designed. At the same time,in order to reduce stator current ripples and improve control accuracy,MPCC method is given for selecting the optimal voltage vector of voltage source inverter. The controller provides the system with more degrees of freedom and it is ensured that the fractional order integral action of switching term is included directly in the proposed controller, so that the free-chattering sliding mode control can be achieved by utilizing its filtering property. Compared with two PMSM MPCC drive systems （one is PI-ba^ed regulator, the other is IOSM- based sliding mode-based regulator）, NFOSM-based one possesses better dynamical performance and stronger robustness as well as weaker chattering and smaller THD index of three-phase stator currents. The simulation results validate the feasibility and effectiveness of the proposed scheme.