双三相永磁同步电机谐波闭环模型预测容错控制

Harmonic closed-loop model predictive fault-tolerant control of a dual three-phase permanent magnet synchronous motor

双三相永磁同步电机在开路故障后,谐波平面和基波平面发生耦合.基于正常解耦变换的谐波闭环控制策略在故障发生后,基波平面和谐波平面的电流控制器产生冲突,从而影响电机系统的容错性能.为此,本文针对单相开路故障,提出双三相永磁同步电机谐波闭环模型预测容错控制策略,利用降维解耦矩阵推导容错预测模型,消除不同平面电流间的耦合效应,避免控制器冲突.此外,推导故障后电压矢量的分布情况,并在此基础上重构开路故障情况下的虚拟电压矢量控制集.最后,为了抑制非线性因素引起的谐波电流,设计谐波电压扩张状态观测器,通过坐标变换快速获得需要补偿的占空比,注入修正后的电压矢量中,完成谐波闭环控制.实验结果表明,所提方法具有可行性和有效性.

The harmonic plane is coupled with the fundamental plane for the open-circuit-fault dual three-phase permanent magnet synchronous motor(DTP-PMSM).The conventional closed-loop control in the harmonic plane caused controller conflicts owing to this coupling effect,which reduced the fault-tolerant performance of the DTP-PMSM.Thus,this paper proposes a harmonic closed-loop faulttolerant control strategy of DTP-PMSM without controller conflict for single-phase open-circuit faults.First,a fault-tolerant prediction model is derived using a dimensionality-reduced decoupling matrix to overcome the coupling effect,and then,a set of virtual voltage vector control sets suitable for open-circuit faults is reconstructed.In addition,a harmonic voltage extended-state observer is designed to suppress the harmonic current caused by nonlinear factors.The duty cycle that needs to be compensated is quickly obtained via coordinate transformation and injected into the corrected voltage vector to complete the harmonic closed-loop control.The experimental results demonstrate the feasibility and effectiveness of the proposed method.