双永磁电机系统转速同步控制

摘要

针对双永磁同步电机系统中,由于负载扰动造成双电机转速不同步而极易引发差速振荡的问题,该文结合交叉耦合控制结构和滑模控制算法,提出一种基于积分型滑模速度控制器的转速同步控制策略,使用指数趋近律以及饱和函数抑制滑模固有的抖振现象.此外,设计了转速同步控制器对两电机的电流环进行补偿,通过选择合适的耦合同步系数,使两电机速度尽快达到同步.实验结果验证了在所提出的控制策略下,双永磁同步电机系统的鲁棒性、转速跟踪性能以及同步性能均得到提升.%In dual permanent magnet synchronous motor (dual-PMSM) system,the speed synchronization of the motors can always be deteriorated by load torque disturbance.This can easily lead to differential oscillation problem.This paper combined cross-coupling structure with sliding mode control algorithm,proposed a speed synchronization control strategy based on integral type sliding mode variable structure speed controller,by using exponential reaching law and saturation function to alleviate the effect of inherent chatting of sliding mode control.In addition,a speed synchronization controller is designed to compensate the reference current of two motors,the speed of two motors can achieve synchronization as soon as possible by setting appropriate coupling synchronous coefficient.Experimental results verified that the proposed control strategy enhances the robustness,the speed tracking and synchronization performance of dual-PMSM system.