异步电机电压空间矢量系统的仿真研究.doc

由于直流电动机结构复杂,制造费时以及需要经常性维护等缺点,使得人们一直努力寻找能替代直流电动机调速的交流电动机调速。随着电力电子技术、PWM调制技术、计算机控制技术、交流电动机的控制技术的发展,交流调速系统由于其坚固耐用、运行可靠等众多优点,正在逐步取代以前直流调速系统,在传动领域占据主导地位。
直到20世纪80年代中期,德国学者们在交流电机调速中提出了磁链轨迹控制的思想,在此基础上进一步发展产生了电压空间矢量脉宽调制(SVPWM)的概念。SVPWM又称磁链追踪型PWM法,它是从电动机的角度出发,着眼于如何使电机获得圆磁场。
本文首先介绍了种种交流调速技术,并逐一的分析其优缺点,然后重点详细的介绍了电压空间矢量脉宽调制(SVPWM)技术,就其如何使电机获得圆磁场进行了具体的分析和推导。并且推导出在MATLAB/SIMULINK环境下SVPWM控制信号的数学模型,并得到SVPWM控制下的电动机输出电流、电压、转速、转矩、磁链等信号的波形,经分析证实了异步电机在SVPWM控制下,具有启动电流小、转速稳定快、直流利用率高、能量损耗少、谐波少、控制简单等优点。
Abstract
As the DC plex, manufacturing time and the need for regular maintenance ings, so people have been looking for an alternative to DC motor speed control of AC motor speed control. With the power electronics, PWM modulation technology, computer control technology, communication technology, the development of motor control, AC drive system because of its rugged, reliable operation of the many advantages, is gradually replacing the previous DC drive system, in drive occupy dominance.
Until the mid-1980s, the German scholars proposed in the alternating current machine velocity modulation the flux linkage trajectory control's thought that based on this further developed has had the voltage space vector pulse-duration modulation (SVPWM) concept. SVPWM said that the flux linkage tracing PWM law, it is from electric motor's angle embarking, how focuses to cause the electrical machinery to obtain the circular field.
This paper introduces the various AC variable speed, and the analysis of their advantages and disadvantages of each, and then focus on a detailed description of the voltage space vector pulse width modulation (SVPWM) technique, on how they get round the motor ic field analysis and derivation of specific . And derived in the MATLAB / SIMULINK environment, the mathematical model of SVPWM control signal, and get SVPWM under the control of motor output current, voltage, speed, torque, flux and other waveform, confirmed by the analysis of induction motor under the control of the S