To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed ...To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed in this paper.Two new look-up tables are proposed,these are derived on the basis of the control of the electromagnetic torque and stator flux using all the feasible voltage vectors and their associated switching states.Finite control set model predictive control(FCS-MPC)has then been adopted to select the optimal switching state that minimizes the cost function related to the electromagnetic torque.Finally,the experimental results are shown to verify the reduced torque ripple performance of the proposed MPC-based DTC method.展开更多
Model predictive control(MPC)has attracted widespread attention in both academic and industry communities due to its merits of intuitive concept,quick dynamic response,multi-variable control,ability to handle various ...Model predictive control(MPC)has attracted widespread attention in both academic and industry communities due to its merits of intuitive concept,quick dynamic response,multi-variable control,ability to handle various nonlinear constraints,and so on.It is considered a powerful alternative to field oriented control(FOC)and direct torque control(DTC)in high performance AC motor drives.Compared to FOC,MPC eliminates the use of internal current control loops and modulation block,hence featuring very quick dynamic response.Compared to DTC,MPC uses a cost function rather than a heuristic switching table to select the best voltage vector,producing better steady state performance.In spite of the merits above,MPC also presents some drawbacks such as high computational burden,nontrivial weighting factor tuning,high sampling frequency,variable switching frequency,model/parameter dependence and relatively high steady ripples in torque and stator flux.This paper presents the state of the art of MPC in high performance induction motor(IM)drives,and in particular the progress on solving the drawbacks of conventional MPC.Finally,one of the improved MPC is compared to FOC to validate its superiority.It is shown that the improved MPC has great potential in the future high performance AC motor drives.展开更多
针对二极管箝位型(neutral point clamped,NPC)三电平逆变器驱动异步电机的低开关频率控制,提出了一种新颖的模型预测直接电流控制(model predictive direct current control,MPDCC)方法.基于推导的传动系统离散时间内部预测模型,控制...针对二极管箝位型(neutral point clamped,NPC)三电平逆变器驱动异步电机的低开关频率控制,提出了一种新颖的模型预测直接电流控制(model predictive direct current control,MPDCC)方法.基于推导的传动系统离散时间内部预测模型,控制器预测了每个容许开关位置对应的电流输出轨迹、外推输出轨迹,并根据评估平均开关频率的价值函数在线滚动优化实时求取最优开关矢量,使得逆变器平均开关频率最小化,且保持电流轨迹在给定的滞环范围内.相对于已有的单步预测电流控制方法,该方法在保持基本相同谐波性能的同时显著降低了开关频率.仿真结果表明,低开关频率模型预测电流控制算法可将三电平逆变器的平均开关频率降低至500 Hz以下,并且具有较理想的电流谐波畸变和动态响应性能.展开更多
基金This work was supported in part by the Hunan Provincial Key Laboratory of Power Electronics Equipment and Grid under Grant 2018TP1001in part by the National Natural Science Foundation of China under Grant 61903382,51807206,61933011+1 种基金in part by the Major Project of Changzhutan Self-Dependent Innovation Demonstration Area under Grant 2018XK2002in part by the Natural Science Foundation of Hunan Province,China under Grant 2020JJ5722 and 2020JJ5753.
文摘To reduce the torque ripple in motors resulting from the use of conventional direct torque control(DTC),a model predictive control(MPC)-based DTC strategy for a direct matrix converter-fed induction motor is proposed in this paper.Two new look-up tables are proposed,these are derived on the basis of the control of the electromagnetic torque and stator flux using all the feasible voltage vectors and their associated switching states.Finite control set model predictive control(FCS-MPC)has then been adopted to select the optimal switching state that minimizes the cost function related to the electromagnetic torque.Finally,the experimental results are shown to verify the reduced torque ripple performance of the proposed MPC-based DTC method.
文摘Model predictive control(MPC)has attracted widespread attention in both academic and industry communities due to its merits of intuitive concept,quick dynamic response,multi-variable control,ability to handle various nonlinear constraints,and so on.It is considered a powerful alternative to field oriented control(FOC)and direct torque control(DTC)in high performance AC motor drives.Compared to FOC,MPC eliminates the use of internal current control loops and modulation block,hence featuring very quick dynamic response.Compared to DTC,MPC uses a cost function rather than a heuristic switching table to select the best voltage vector,producing better steady state performance.In spite of the merits above,MPC also presents some drawbacks such as high computational burden,nontrivial weighting factor tuning,high sampling frequency,variable switching frequency,model/parameter dependence and relatively high steady ripples in torque and stator flux.This paper presents the state of the art of MPC in high performance induction motor(IM)drives,and in particular the progress on solving the drawbacks of conventional MPC.Finally,one of the improved MPC is compared to FOC to validate its superiority.It is shown that the improved MPC has great potential in the future high performance AC motor drives.
文摘针对二极管箝位型(neutral point clamped,NPC)三电平逆变器驱动异步电机的低开关频率控制,提出了一种新颖的模型预测直接电流控制(model predictive direct current control,MPDCC)方法.基于推导的传动系统离散时间内部预测模型,控制器预测了每个容许开关位置对应的电流输出轨迹、外推输出轨迹,并根据评估平均开关频率的价值函数在线滚动优化实时求取最优开关矢量,使得逆变器平均开关频率最小化,且保持电流轨迹在给定的滞环范围内.相对于已有的单步预测电流控制方法,该方法在保持基本相同谐波性能的同时显著降低了开关频率.仿真结果表明,低开关频率模型预测电流控制算法可将三电平逆变器的平均开关频率降低至500 Hz以下,并且具有较理想的电流谐波畸变和动态响应性能.
