NPC三电平容错逆变器异步电机驱动系统FCS-MPTC  

Finite control set model predictive torque control for IM systems driven by three-phase eight-switch fault-tolerant inverter

作　　者：张磊 王思明 梁运华 ZHANG Lei;WANG Siming;LIANG Yunhua(Department of Automaton and Electrical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学自动化与电气工程学院

出　　处：《铁道科学与工程学报》2020年第1期207-214,共8页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(61263004)

摘　　要：针对异步电机(IM)驱动系统中NPC型三电平逆变器的某桥臂故障问题,提出一种三相八开关容错逆变器(TPESFTI)控制策略。通过搭建拓扑结构和输出电压模型发现TPESFTI存在直流侧电容电压不平衡的问题,基于此又提出由于延迟补偿的有限控制集模型预测直接转矩控制(FCS-MPTC)策略。FCS-MPTC策略能够利用其目标函数的非线性约束项来抑制母线电容分压不均衡、同时考虑模型控制的运算量和系统迟延等不利影响。通过进行仿真验证,研究结果表明:该控制策略能够确保系统稳定可靠运行,具有良好的动态性能,且有效地抑制母线电容分压不均对系统的影响,验证所提控制策略的可靠和有效性。A three-phase eight-switch fault-tolerant inverter(TPESFTI) control strategy was proposed for a bridge arm fault of NPC three-level inverters in induction motor(IM) drive system. However, it was found that TPESFTI has the disadvantage of unbalanced DC capacitor voltage by building the topology and output voltage model. For further optimization, a finite control set model predictive direct torque control(FCS-MPTC) strategy based on this delay compensation was proposed to solve this problem. The FCS-MPTC strategy can utilize the non-linear constraints of its objective function to suppress the unbalanced voltage dividing of bus capacitors, taking into account the computational complexity of model control and the system delay. The simulation results show that the control strategy can ensure the stable and reliable operation of the system. It has good dynamic performance, and effectively suppresses the impact of unbalanced bus capacitor voltage distribution on the system. This verifies the reliability and effectiveness of the proposed control strategy.

关 键 词：三相八开关容错逆变器 有限控制集模型预测直接转矩控制 逆变器故障 不平衡电压 异步电机 

分 类 号：TM341[电气工程—电机]