在五相永磁同步电机(permanent-magnet synchronous motor,PMSM)中,有限集模型预测容错控制(finite control set model predictive fault tolerant control,FCS-MPFTC)存在计算量大、电流谐波含量高等问题.因此,该文提出一种简化FCS-MPFTC来实现相开路和短路故障情况下的统一容错控制.首先,将模型预测电流控制的电流代价函数等效转化为电压代价函数,并采用无差拍方法通过电流模型计算出参考电压.然后,基于抑制三次谐波电流为0的原则合成虚拟电压矢量(virtual voltage vector,V3);通过重构V3和扇区,以直接获得参考电压矢量对应的最优电压矢量.最后,对传统和简化FCS-MPFTC在开路和短路故障下进行对比实验.结果表明,所提策略能够有效减小故障后计算量、转矩脉动以及电流谐波含量.
A Unified Fault-tolerant Control of Five-phase PMSM Based on Simplified Finite Control Set Model Predictive Current Control
Five-phase permanent-magnet synchronous motor(PMSM)with finite set model predictive fault-tolerant control(FCS-MPFTC)has large computational complexity and high harmonic currents.Therefore,this paper proposes a simplified FCS-MPFTC strategy to achieve unified fault-tolerant control under open-circuit and short-circuit fault conditions.First,the current cost function of the model predicted current control is equivalently transformed into a voltage cost function,and reference voltages are calculated by the current model with the deadbeat method.Then,virtual voltage vectors(V3)are synthesized based on restraining the third harmonic current to zero.By reconstructing V3 and sectors,the optimal voltage vector corresponding to the reference voltage vector can be directly obtained.Finally,the experimental results of traditional and simplified FCS-MPFTC are presented to demonstrate the effectiveness of the proposed strategy.
permanent-magnet synchronous motor(PMSM)model predictive control(MPC)virtual voltage vector(V3)fault-tolerant controldead-beat control
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