【作者】 罗鹏；

【导师】 王远波；

【作者基本信息】 西南交通大学 ， 电力电子与电力传动， 2014， 硕士

【摘要】 随着电力电子器件以及数字信号处理芯片的快速发展,三相感应电机交流调速技术得到了极大的提高,与三相交流调速系统相比,多相电机交流调速系统具有低电压大功率、系统的可靠性极高以及电磁转矩脉动小等优点,在供电电压的等级受到限制的场合,要实现中大功率驱动,使用功率器件的串并联必然会带来均压或均流等复杂问题,多相电机交流调速系统在这方面优势更为突出,目前,多相电机调速系统侧重于舰船推进系统、大功率及其高可靠性的场合。本文选择双三相感应电机作为研究对象,根据坐标变换理论,首先推导了从六相自然坐标系到两相静止αβ坐标系的解耦坐标变换矩阵,并在此基础上建立了两相静止αβ坐标系下的双三相感应电机数学模型,介绍了双三相感应电机的定转子磁链、电压、电流以及运动方程。其次,分析了双三相电压源逆变器供电形式下的电压空间矢量分布,在三相SVPWM调制算法的基础之上,分析传统的六相SVPWM,并设计了基于零序平衡的六相SVPWM调制算法,并对其进行中心化处理；另外,详细分析了电压空间矢量对电磁转矩和定子磁链的影响,同时简单介绍了直接转矩控制的基本原理,并设计了一套基于零序平衡六相SVPWM的直接转矩控制系统。另外,本文根据磁动势等效原则,本文推导了双三相感应电动机在定子绕组一相或两相开路后的坐标变换及其数学模型,在虚拟同步旋转坐标变换下,设计了一套适用于缺相后的基于转子磁场定向的矢量控制系统。在MATLAB/Simulink仿真软件下,建立了双三相感应电机基于SVPWM的直接转矩控制系统和缺相后基于转子磁场定向的矢量控制系统仿真模型,并对仿真结果进行了详细的分析,同时,仿真结果验证了所设计控制系统的正确性。最后,利用TI公司生产的TMS320F28335数字信号处理芯片作为本文设计硬件实验平台的主要控制芯片,设计出各个部分的控制电路,并根据基于SVPWM的直接转矩控制的软件系统设计流程,在CCS3.3软件平台下,运用C语言编写控制系统的程序,在硬件实验平台上,通过实验验证了基于SVPWM的直接转矩控制系统的可行性,为以后研究工作做好充分准备。更多还原

【Abstract】 With the development of power electronic device and digital signal processing chip, the speed regulation technology of three-phase ac motor has been greatly improved. The speed regulation system of the multiphase induction motor has made great advantages compared with the speed regulation system of three phase ac motor, such as high reliability, high power but low dc power and low electromagnetic torque ripple, obtaining a middle or high power drive will bring about voltage-sharing or current-sharing problem of the power device in series or parallel circuits in the restricted circumstance for the voltage of power supply. Recently, the application of speed regulation system of multi phase motor focuses on military and high reliability, high power situations, ship propulsion system and so on.This paper chooses dual three-phase induction motor as the object of study, according to the coordinate transformation theory, the decoupling coordinate transformation matrix from six phase natural coordinate system to two phase stationary a/3coordinate system is derived in this paper firstly, and the math model on the a/3coordinate system is established based on the decoupling coordinate transformation matrix, meanwhile, the equation of stator and rotor flux linkage, voltage, current and motion are introduced.Secondly, the voltage space vector distribution of dual three-phase voltage-source inverter is introduced, and the traditional six phase SVPWM modulation arithmetic is analyzed based on three phase SVPWM modulation arithmetic, moreover, six phase SVPWM based on zero sequence balance is designed and central processed, in addition, the effect of the voltage space vector to electromagnetic torque and stator flux is analyzed in detail, at the same time, introducing simply the fundamental principle of direct torque control and designing a direct torque control system based on six phase zero sequence balance SVPWM modulation arithmetic.Besides, according to the equivalent principle of magnetic motive force, the coordinate transformation and math model under one or two phase stator windings defaulted of dual three-phase induction motor is deduced in this paper, meanwhile, the rotor field oriented vector control system aimed at the dual three-phase induction motor under one or two phase stator windings defaulted is designed based on the virtual synchronous rotating coordinate transformation.Under the MATLAB/Simulink simulation platform, the simulation models of the direct torque control system based on six phase zero sequence balance SVPWM modulation arithmetic and the rotor field oriented vector control system aimed at the dual three-phase induction motor under one or two phase stator windings defaulted are built, the simulation results are analyzed in detail and also verify the correctness of the designed control system in this paper.At last, the digital signal processing chip TMS320F28335produced in Texas Instruments company is used as the main control chip in the hardware experimental platform, the control circuits per section are designed in the platform, according to the flow chart of software system about direct torque control system based on six phase zero sequence balance SVPWM modulation arithmetic, the corresponding control algorithms are programmed in the CCS3.3software development platform by using C language, and the program debugging is performed based on the hardware circuit, the experiment results testify the effectiveness of the direct torque control system, which makes a full preparation for the follow study.更多还原