五相PMSM相邻两相开路故障容错控制策略

Fault-tolerant control strategy for five-phase PMSM under adjacent two-phase open circuit fault

相永磁同步电机(permanent magnet synchronous motor, PMSM)发生相邻两相开路故障会导致驱动系统不稳定运行,针对这种故障状况,提出一种基于空间矢量脉宽调制(space vector pulse width modulation, SVPWM)技术的容错控制策略。首先构建永磁同步电机数学模型;进而为使机电能量实现平稳转换,重新构建降阶变换矩阵,得到故障后剩余相容错电流表达式;然后利用SVPWM技术,计算故障下空间电压矢量,建立6个扇区,进行目标矢量合成,进而计算相应基本合成电压矢量的作用时间,并给出对应扇区的空间电压矢量选择顺序;最后进行Matlab/Simulink仿真验证,仿真结果与理论计算一致,有效验证了所提SVPWM容错控制策略的正确性。利用该容错控制策略,五相永磁同步电机在故障状态下的运行性能得到明显改善,电机实现稳定运行。所提控制策略与传统电流滞环跟踪脉宽调制(pulse width modulation, PWM)控制方式对比分析,证明所提策略存在优越性。

A two-phase open circuit fault in a five-phase permanent magnet synchronous motor(PMSM)can destabilize the entire drive system.In response to this fault scenario,a fault-tolerant control strategy utilizing space vector pulse width modulation(SVPWM)technology is proposed.Firstly,a mathematical model of the permanent magnet synchronous motor is constructed.To ensure smooth conversion of electromechanical energy,a reduced order transformation matrix is reconstructed,yielding the expression for fault-tolerant current in the residual phase.Subsequently,SVPWM technology is used to calculate the space voltage vector during the fault,delineate six sectors,synthesize the target vector,determine the action time of corresponding basic synthetic voltage vectors,and establish the selection order for space voltage vectors within the respective sector.Finally,MATLAB/Simulink simulations validate the correctness of the strategy by demonstrating consistency between simulation results and theoretical calculations.This approach significantly enhances the operation performance of the five-phase permanent magnet synchronous motor under fault conditions,ensuring its stability.A comparison with traditional current hysteresis tracking pulse width modulation(PWM)control confirms the superiority of the proposed strategy.