新能源农机用双永磁游标电机的模型预测电流控制

Model Predictive Current Control of Double Permanent Magnet Vernier Motor for New Energy Agricultural Machinery

模块化双永磁游标电机兼具高转矩密度和低铁耗,适用于低速大转矩的直驱应用领域。针对新能源农机用模块化双永磁游标电机控制系统存在的转矩脉动大、电流谐波多和转速波动大等问题,提出一种基于改进式模型预测电流控制策略。相比于传统模型预测电流控制,提出的控制策略采用双矢量模型预测电流控制,在每个控制周期内可同时选择2个任意电压矢量组合作用,扩大了电压矢量的选择和幅值调节范围,可进行更准确的电流控制。同时,考虑系统延迟,在预测控制中加入电流延迟补偿环节。仿真结果表明,所提的控制策略可有效减小转矩脉动、电流谐波和转速波动,提升系统的控制性能。

Modular dual permanent magnet vernier machine incorporate the merits of high torque density and low iron loss,suitable for low-speed high-torque applications.Due to high torque ripples,high current harmonics and high speed fluctuations in control system of modular dual permanent magnet machine for new energy tractor,an improved model predictive current control strategy is proposed.Compared with conventional model predictive current control,mode predictive current control based on dual vector is adopted in proposed strategy,double arbitrary voltage vector can be selected to operate simultaneously in each control cycle that extends selection range of voltage vector and adjustment range of amplitude,which can realize more accurate current control.Meanwhile,considering system delay,current delay compensation is added to predictive control.The simulation results showed that proposed control strategy can effectively reduce torque ripples,current harmonics and speed fluctuations,thus improving control performance of the system.