基于电压矢量快速筛选的永磁同步电机三矢量模型预测转矩控制

Voltage Vector Rapid Screening-Based Three-Vector Model Predictive Torque Control for Permanent Magnet Synchronous Motor

占空比模型预测转矩控制通过优化有效电压矢量的占空比来减小转矩脉动,然而要得到最优有效电压矢量需要进行6次预测,计算量较大,而且第二个电压矢量只能是零矢量,导致转矩脉动仍较大。该文提出一种基于电压矢量快速筛选的永磁同步电机三矢量模型预测转矩控制策略,为了最大限度地降低控制复杂度并减小计算量,设计一种新型开关表,两个有效电压矢量将从开关表中选择,同时提出一种新的占空比计算方法,以期实现转矩与磁链的无差拍控制。实验结果表明,与占空比模型预测转矩控制相比,该文所提方法可以有效减小转矩脉动,实现稳态性能的改善。

The torque ripple can be reduced in the duty cycle model predictive torque control(Duty-MPTC)by optimizing the duty cycle of the active voltage vector.However,obtaining the optimal active voltage vector needs six predictions,which requires a large amount of calculation,and the torque ripple is still large since the second voltage vector in the conventional Duty-MPTC can only be a zero vector.Therefore,in this paper,a new voltage vector rapid screening-based three-vector model predictive torque control(TV-MPTC)for permanent magnet synchronous motor(PMSM)is proposed.In order to minimize the control complexity and reduce the amount of calculation,the two active voltage vectors are selected directly from the new switching table.Also,a new duty cycle calculation method is proposed to achieve the deadbeat control of torque and flux.The experimental results show that compared with the Duty-MPTC method,the proposed TV-MPTC method can effectively reduce the torque ripple,thereby improving the steady-state performance.