论文部分内容阅读
为抑制开关磁阻电机总输出转矩的脉动、简化控制算法,该文研究一种基于直接转矩控制电压矢量选择的模型预测控制算法.该方法继承模型预测控制逻辑简单、控制灵活的优点,利用直接转矩控制扇区划分的原理进行换相的判断使得代价函数不再复杂,利用电压矢量与扇区的对应关系简化预测控制的输入变量.新算法避免了大量重复无用的计算,也不再依赖滞环信号选择电压矢量,在控制周期固定且相对较短的同时具有较好的转矩脉动抑制效果,其他性能也有所改善,为进一步优化算法提供了可能,增强了算法的实用性.在一台三相12/8结构样机上进行仿真和实验验证,并将传统模型预测控制与直接转矩控制的仿真、实验现象与之对比.结果表明,提出的新算法达到了预期的性能.“,”For the aim of reducing total output torque ripple and simplifying the control scheme,this paper studied on a new model predictive control method based on voltage vector selecting of direct torque control.This method remained the simplification and flexibility of model predictive control.Sectors where combined fiux vector was located in were utilized to determine the commutation logic,resulting in asimplified cost function.By the corresponding relation between sectors and voltage vectors,input variables of predictive controller were reduced.The new scheme avoids mass useless computation and no longer relies on hysteresis signals to generate voltage vectors,which gains a good torque ripple minimization performance on a fixed and relatively small control frequency.Thus the new scheme has the potential for further improvement and practicability.Simulations and experiments were carried out on a three-phase 12/8 structure SRM.For comparison,direct torque control and model predictive control methods were also tested.The results prove that the new method achieves the design anticipation.