基于权重系数消除和有限控制集优化的双三相永磁容错电机快速预测直接转矩控制  

Fast Predictive Direct Torque Control of Dual Three-Phase Permanent Magnet Fault Tolerant Machine Based on Weighting Factor Elimination and Finite Control Set optimization

作　　者：赵勇 黄文新[1] 林晓刚 姜文 Zhao Yong Huang;Wenxin Lin Xiaogang;Jiang Wen(College of Automation Engineering Nanjing University of Aeronautics and Astronautics,Nanjing,211106,China)

机构地区：[1]南京航空航天大学自动化学院,南京211106

出　　处：《电工技术学报》2021年第1期3-14,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51777096);江苏省研究生科研创新计划(KYCX18_0285)资助项目。

摘　　要：为改善双三相永磁容错电机采用传统预测直接转矩控制(PDTC)时存在的权重系数整定困难、有限控制集元素数量多以及电压矢量滚动寻优时间长等问题,该文提出一种基于权重系数消除和有限控制集优化的快速PDTC。首先,根据无差拍直接转矩磁链控制思想,将评价函数中不同量纲的变量等效为相同量纲的电压矢量,消除了定子磁链权重系数;其次,基于永磁容错电机大电感的特点,提出仅选取零序电压为零的电压矢量或者所合成虚拟电压矢量作为有限控制集元素,不仅消除了零序权重系数,还将有限控制集中的元素从64个减少到19个,同时改善了零序电流的抑制效果;最后设计了一种可一次选出最优电压矢量的方法,避免了滚动寻优带来的计算负担。实验结果验证了所提PDTC的可行性和有效性。In this paper,a fast predictive direct torque control(PDTC)based on weighting factor elimination and finite control set optimization is presented.The weighing factors are removed and the number of elements in finite control set are reduced.The heavy computing burden of conventional PDTC for dual three-phase permanent magnet fault tolerant machine system are also released.Firstly,according to the deadbeat direct torque and flux control,the variables with different dimensions in the cost function are all equivalent to the voltage vectors,eliminating the weighting factor of stator flux.Then,based on the large flux leakage of permanent magnet fault tolerant machine,only the voltage vectors or virtual voltage vectors whose zero-sequence voltages are zero are selected as the elements of finite control set.As a result,the weighting factor of zero sequence is eliminated,and the elements number of finite control set is decreased from 64 to 19.Besides that,the zero-sequence currents are improved.Finally,a fast method which just needs one time to select the optimal voltage vector is designed.The experimental results verify the feasibility and effectiveness of proposed PDTC.

关 键 词：双三相永磁容错电机 预测直接转矩控制(PDTC) 权重系数消除 有限控制集优 化 快速电压矢量选择 

分 类 号：TM341[电气工程—电机]