优化转矩开关表的异步电机模型预测转矩控制  

Model predictive torque control of induction motor based on optimized torque switch table

作　　者：向超群[1] 欧阳泽铿 张璐琳 李卓鑫 成庶[1] XIANG Chaoqun;OUYANG Zekeng;ZHANG Lulin;LI Zhuoxin;CHENG Shu(School of Traffic and Transportation Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学交通运输工程学院,湖南长沙410083

出　　处：《铁道科学与工程学报》2021年第12期3328-3336,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(52002409)。

摘　　要：模型预测转矩控制(MPTC)采用实时在线计算的方式确保预施加的电压矢量为最优矢量,但是其代价函数的计算量也随着电平数的增加成倍增加。为了减小计算量,提升转矩控制性能,提出一种基于优化转矩开关表的MPTC方法。对占空比控制时双电压矢量对转矩和磁链的综合作用进行分析,在此基础上进行扇区划分,建立优化转矩开关表,通过计算定子磁链所在扇区,根据转矩控制要求,从优化开关表选择电压矢量。提出的方法与传统MPTC相比,在一个控制周期内只需计算3次代价函数值,并且使用2个矢量合成参考矢量,既减少了代价函数的计算量,也提升了系统的稳态性能。仿真和实验结果证明,同等速度和负载条件下,采用本方法,不仅能减小计算量,还能减小转矩脉动和谐波含量。Model predictive torque control(MPTC) adopts real-time on-line calculation to ensure that the preapplied voltage vector is the optimal vector, but the calculation amount of its cost function increases exponentially with the number of levels. In order to reduce the calculation and improve the performance of torque control, a MPTC method based on optimized torque switch table was proposed. In this paper, the comprehensive effect of two voltage vectors on torque and stator flux in duty cycle control was analyzed. On this basis, the sector division was carried out and the optimal torque switch table was established. By calculating the sector of stator flux, the voltage vector was selected from the optimized switch table according to the requirements of torque control. Compared with the traditional MPTC, the proposed method only needs to calculate the cost function three times in a control cycle, and uses two vectors to synthesize the reference vector, which not only reduces the calculation of the cost function, but also improves the steady-state performance of the system. The simulation and experimental results show that, under the same speed and load conditions, the proposed method can not only reduce the amount of calculation, but also reduce the torque ripple and current harmonic.

关 键 词：模型预测转矩控制 开关表 高计算效率 

分 类 号：TM464[电气工程—电器] TM343