三相永磁同步电机断相容错控制

Fault-Tolerant Control Strategy for Three-Phase Permanent Magnet Synchronous Motor in Case of One Phase Open-Circuit

为了提高三相永磁同步电机(PMSM)控制系统的容错能力,减小定子绕组断路故障时电机电磁转矩的脉动,提出了三相永磁同步电机断相容错控制策略。基于故障后正常相绕组电流与电压之间的关系,建立了三相PMSM一相绕组开路时的数学模型。通过分析故障前后电机的电磁转矩,提出了电磁转矩输出不变的容错控制策略,通过调整非故障相电流的幅值与相位,计算前馈零轴电压,保证一相绕组开路故障时电机的正常运行。为了提升电机故障下电磁转矩输出的平稳性,提出前馈零轴电压与中线电流闭环修正相结合的容错控制策略,实现了电机控制系统故障条件下的无扰动运行。采用转子磁场定向的方法,通过在旋转坐标系下交直轴电流控制器上增加前馈零轴电压和中线电流闭环修正,实现了一相绕组开路时的转矩脉动的补偿。实验结果表明,该文提出的容错控制算法可以有效减小三相PMSM在定子绕组发生开路故障时的电机电磁转矩脉动,提高电机控制系统的容错性能。

To improve the reliability of three-phase permanent magnet synchronous motor(PMSM)control system and reduce the ripple of output torque in case of the stator windings occur open-circuit,a fault-tolerant control strategy for three-phase PMSM was proposed.Based on the relationship of current and voltage of non-fault phase,a mathematical model of the three-phase PMSM with one phase open-circuit was established.According to the analysis of the output torque under healthy and fault state,a fault-tolerant control strategy with output torque invariant was proposed.By redistributing the magnitude and phase of the non-fault phase current,the feed forward zero axis voltage was calculated to ensure the normal operation of the drive system.In order to improve the stability of output torque under phase open-fault,A combination control strategy of the feed forward zero axis voltage and closed loop correction of central current was proposed,which realized no-disturbed operation.By adopting rotor field oriented method,adding the feed forward zero axis voltage and closed loop correction of central current controller to dq current controller,the output torque was compensated.The experimental results show that the method is correct and effective to improve the reliability of the drive system.