结合开关表的三电平逆变器永磁同步电机模型预测转矩控制  

Model Predictive Torque Control with Switching Table for Neutral Point Clamped Three-Level Inverter-Fed Permanent Magnet Synchronous Motor

作　　者：夏长亮[1,2] 张天一[1] 周湛清[1] 张国政[1] 史婷娜[1] 

机构地区：[1]天津大学电气与自动化工程学院,天津300072 [2]天津市电机系统先进设计与智能控制技术工程中心,天津300387

出　　处：《电工技术学报》2016年第20期83-92,110,共11页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)资助项目(2013CB035600)

摘　　要：提出了一种应用于中点钳位型(NPC)三电平逆变器馈电的永磁同步电机(PMSM)调速系统的改进模型预测转矩控制(MPTC)策略。该策略将评价函数中磁链和电磁转矩控制部分等效为空间矢量图中参考电压与基本电压矢量差的模,然后合理划分区域,建立能够选择出使上述模最小的电压矢量的预测开关表。并将这个电压矢量作为第二步预测的输出,从而以一次查表代替传统MPTC第二步预测中多次模型预测计算。实验结果证明,改进策略可以很好地实现对磁链、电磁转矩和中点电位的控制的同时,解决了传统两步预测MPTC计算量大的问题。A model predictive torque control （MPTC） is proposed for a neutral point clamped （NPC） three-level inverter based permanent magnet synchronous motor （PMSM） drive system. The flux and torque components in the cost function are equivalent to the amplitude of the difference between reference voltage vector and the basic voltage vector. By dividing the vector space logically, a predictive switching table is built. The built switching table can select the voltage vector which minimizes the amplitude mentioned above. The selected vector is then used as the output of the second step prediction. Thereby multiple model predictive calculations of the second step prediction are replaced by selecting a vector from switching table. The experimental results show that the improved MPTC strategy controls the flux, torque and neutral point voltage effectively. Compared with the traditional MPTC method, the improved MPTC strategy also has lower computation.

关 键 词：中点钳位型三电平逆变器 永磁同步电机 模型预测转矩控制 预测开关表 

分 类 号：TM351[电气工程—电机]