感应电机双PWM变流器模型预测控制研究
发布时间：2018-11-11 01:16
【摘要】：感应电机双PWM变流器由PWM整流器和PWM逆变器通过直流环节连接构成，研究其控制策略对于提高系统性能具有重要意义。近年来，模型预测控制凭借其在解决多约束、多目标优化等方面的优势，在电力电子领域得到诸多应用。本文对感应电机双PWM变流器有限控制集模型预测控制（FCS-MPC）及改进控制策略进行了研究。 首先，以两电平PWM整流器为对象，介绍了FCS-MPC策略的基本原理。针对FCS-MPC存在的开关频率非恒定和采样频率较高的缺点，，给出了一种PWM整流器有限开关序列模型预测电流控制（FSS-MPCC）策略。PWM整流器FSS-MPCC通过构建12组开关序列作为控制集，采用无差拍控制方式求取每组开关序列内各个开关状态的作用时间，构建目标函数，在线寻优。通过MATLAB软件验证了PWM整流器FSS-MPCC的有效性，并与FCS-MPC进行了对比分析，表明了所给出的FSS-MPCC能在较低采样频率下实现恒频控制，且仍具有FCS-MPC的高动态性能。 其次，研究了一种三电平PWM整流器模型预测电流控制（MPCC）策略。针对中点电位波动问题，分析了不同电压矢量对中点电位的影响，给出了一种基于查表的中点电位平衡控制方法。建立了三电平PWM整流器αβ坐标系下的数学模型，设计了三电平PWM整流器MPCC控制系统，并进行延时补偿。对整流器MPCC系统进行了仿真分析，验证了所给出的中点电位平衡方法的有效性。 再次，为优化MPCC寻优过程、减少计算量，给出了一种感应电机NPC三电平逆变器准无差拍模型预测电流控制（QD-MPCC）策略。设计了感应电机QD-MPCC准无差拍控制器，求出电机定子给定电压矢量，预测定子电流，构建目标函数，从其所处扇区包含的电压矢量中寻优，减少滚动次数，提升寻优效率，进而减少计算耗时。设计了基于QD-MPCC的感应电机控制系统，进行了数字延时补偿，在系统中采用了一种闭环磁链观测器以提高磁链观测精度。通过仿真验证了感应电机QD-MPCC策略的有效性，表明了感应电机QD-MPCC系统具有良好的动静态性能和较强的鲁棒性。 最后，介绍了PWM整流器实验平台和感应电机QD-MPCC系统实验平台，进行了实验研究，分析了实验结果，进一步验证了所述控制策略的有效性。
[Abstract]:The double PWM converter of induction motor is composed of PWM rectifier and PWM inverter connected by DC link. It is very important to study its control strategy for improving the system performance. In recent years, model predictive control (MPC) has been widely used in power electronics field because of its advantages in solving multi-constraint and multi-objective optimization. In this paper, the finite control set predictive control (FCS-MPC) and improved control strategy for dual PWM converter of induction motor are studied. Firstly, the basic principle of FCS-MPC strategy is introduced based on the two-level PWM rectifier. Aiming at the disadvantage of unsteady switching frequency and high sampling frequency in FCS-MPC, This paper presents a predictive current control (FSS-MPCC) strategy for finite switching sequence model of PWM rectifier. PWM rectifier FSS-MPCC constructs 12 sets of switching sequences as control set. The action time of each switching state in each group of switch sequences is obtained by using the deadbeat control method, and the objective function is constructed to search for the best on line. The validity of PWM rectifier FSS-MPCC is verified by MATLAB software, and compared with that of FCS-MPC. It is shown that the proposed FSS-MPCC can realize constant frequency control at lower sampling frequency and still has the high dynamic performance of FCS-MPC. Secondly, a three-level PWM rectifier model predictive current control (MPCC) strategy is studied. The effect of different voltage vectors on midpoint potential is analyzed, and a control method of midpoint potential balance based on look-up table is presented. The mathematical model of three-level PWM rectifier in 伪 尾 coordinate system is established, and the MPCC control system of three-level PWM rectifier is designed, and the delay compensation is carried out. The simulation analysis of rectifier MPCC system is carried out to verify the effectiveness of the proposed midpoint potential balance method. Thirdly, in order to optimize the MPCC optimization process and reduce the computational complexity, a quasi-deadbeat model predictive current control (QD-MPCC) strategy for NPC three-level inverter of induction motor is presented. The QD-MPCC quasi beat controller of induction motor is designed, the stator voltage vector is given, the stator current is predicted, the objective function is constructed, and the optimization is obtained from the voltage vector contained in the sector, which can reduce the rolling times and improve the optimization efficiency. Thus, the computational time is reduced. The control system of induction motor based on QD-MPCC is designed, and the digital delay compensation is carried out. A closed loop flux observer is used to improve the observation accuracy of the flux. The effectiveness of the QD-MPCC strategy of induction motor is verified by simulation. It is shown that the induction motor QD-MPCC system has good dynamic and static performance and strong robustness. Finally, the experimental platform of PWM rectifier and QD-MPCC system of induction motor is introduced. The experimental results are analyzed and the effectiveness of the control strategy is further verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
本文编号：2324091
[Abstract]:The double PWM converter of induction motor is composed of PWM rectifier and PWM inverter connected by DC link. It is very important to study its control strategy for improving the system performance. In recent years, model predictive control (MPC) has been widely used in power electronics field because of its advantages in solving multi-constraint and multi-objective optimization. In this paper, the finite control set predictive control (FCS-MPC) and improved control strategy for dual PWM converter of induction motor are studied. Firstly, the basic principle of FCS-MPC strategy is introduced based on the two-level PWM rectifier. Aiming at the disadvantage of unsteady switching frequency and high sampling frequency in FCS-MPC, This paper presents a predictive current control (FSS-MPCC) strategy for finite switching sequence model of PWM rectifier. PWM rectifier FSS-MPCC constructs 12 sets of switching sequences as control set. The action time of each switching state in each group of switch sequences is obtained by using the deadbeat control method, and the objective function is constructed to search for the best on line. The validity of PWM rectifier FSS-MPCC is verified by MATLAB software, and compared with that of FCS-MPC. It is shown that the proposed FSS-MPCC can realize constant frequency control at lower sampling frequency and still has the high dynamic performance of FCS-MPC. Secondly, a three-level PWM rectifier model predictive current control (MPCC) strategy is studied. The effect of different voltage vectors on midpoint potential is analyzed, and a control method of midpoint potential balance based on look-up table is presented. The mathematical model of three-level PWM rectifier in 伪 尾 coordinate system is established, and the MPCC control system of three-level PWM rectifier is designed, and the delay compensation is carried out. The simulation analysis of rectifier MPCC system is carried out to verify the effectiveness of the proposed midpoint potential balance method. Thirdly, in order to optimize the MPCC optimization process and reduce the computational complexity, a quasi-deadbeat model predictive current control (QD-MPCC) strategy for NPC three-level inverter of induction motor is presented. The QD-MPCC quasi beat controller of induction motor is designed, the stator voltage vector is given, the stator current is predicted, the objective function is constructed, and the optimization is obtained from the voltage vector contained in the sector, which can reduce the rolling times and improve the optimization efficiency. Thus, the computational time is reduced. The control system of induction motor based on QD-MPCC is designed, and the digital delay compensation is carried out. A closed loop flux observer is used to improve the observation accuracy of the flux. The effectiveness of the QD-MPCC strategy of induction motor is verified by simulation. It is shown that the induction motor QD-MPCC system has good dynamic and static performance and strong robustness. Finally, the experimental platform of PWM rectifier and QD-MPCC system of induction motor is introduced. The experimental results are analyzed and the effectiveness of the control strategy is further verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46
【参考文献】
相关期刊论文 前10条
1 张纯江,顾和荣,赵清林,张秀红;单周期控制无乘法器三相电压型PWM整流器[J];电工技术学报;2003年06期
2 杨勇;赵方平;阮毅;赵春江;;三相并网逆变器模型电流预测控制技术[J];电工技术学报;2011年06期
3 何必;乔鸣忠;林桦;佘宏武;王兴伟;;矩阵变换器输入功率因数可调时的换流控制策略[J];电工技术学报;2012年07期
4 张辉;谭国俊;钱苗旺;鱼瑞文;;基于H_∞控制与最优跟踪控制相结合的三相PWM整流器控制策略[J];电工技术学报;2012年12期
5 陆文斌;姚文熙;吕征宇;;基于改进闭环磁链观测器的感应电机无速度矢量控制[J];电工技术学报;2013年03期
6 宋战锋;夏长亮;谷鑫;;静止坐标系下基于最优时间序列的电压型PWM整流器电流预测控制[J];电工技术学报;2013年03期
7 席裕庚,许晓呜,张钟俊;预测控制的研究现状和多层智能预测控制[J];控制理论与应用;1989年02期
8 席裕庚;李德伟;;预测控制定性综合理论的基本思路和研究现状[J];自动化学报;2008年10期
9 贺娜;姜斌;齐瑞云;;基于模型预测控制的近空间飞行器容错跟踪控制[J];航天控制;2012年06期
10 席裕庚;李德伟;林姝;;模型预测控制——现状与挑战[J];自动化学报;2013年03期
相关博士学位论文 前1条
1 韩耀飞;MW级异步电机双三电平变频系统研究[D];中国矿业大学;2010年
本文编号：2324091
本文链接：https://www.wllwen.com/kejilunwen/dianlilw/2324091.html
教材专著
