基于多目标优化的永磁同步电机容错控制研究

Research on fault-tolerant control of permanent magnet synchronous motor based on multi-objective optimization

电机定子绕组匝间短路是最常见的一类故障形式,若不进行处理会逐渐发展为相间或相对地短路,从而导致电机损坏。为了保障电机的安全运行与故障下转矩输出质量,需要及时对故障电机进行有效的容错控制。首先,以永磁同步电机为研究对象,通过电机定子绕组匝间短路故障等效电路获得电机数学模型,并分析了d-q轴电流平面下的故障电机转矩、短路环流及绕组温升。然后,为实现对故障电机电流的准确预测,对电机定子绕组匝间短路故障等效电路进行合理电路变换,建立故障电机预测模型,进而提出了一种多目标优化预测容错控制策略。最后,搭建电机实验平台,对提出的容错控制策略进行实验验证,结果表明:该方法可有效抑制短路环流及绕组温升并降低故障电机的转矩脉动。

Motor stator winding interturn short-circuit fault(ITF),the most common type of fault form,will gradually de⁃velop into phase-to-phase or phase-to-ground short circuit,resulting in motor damage if not dealt with.To ensure the safe operation and the quality of torque,it is necessary to carry out effective fault-tolerant control in time.Firstly,taking the permanent magnet synchronous motor as the research object,the mathematical model of the motor is obtained through the motor stator winding ITF equivalent circuit,and the faulty motor torque,short-circuit circulating current and winding temperature rise under the d-q current plane are analyzed.Secondly,in order to realize the accurate prediction of the faulty motor current,a reasonable circuit transformation is carried out for the motor stator winding ITF equivalent circuit to establish the faulty motor prediction model,and then a multi-objective optimization prediction fault-tolerant control strategy is proposed.Finally,a motor experimental platform is built to experimentally verify the proposed fault-tolerant control strategy,and the results show that the method can effectively suppress the short circuit loop current and winding temperature rise and reduce the torque ripple of the faulty motor.