【作者】 陈金德；

【导师】 钟彦儒； 王建渊；

【作者基本信息】 西安理工大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 直接转矩控制技术是继矢量控制技术之后的又一种交流电机高性能控制技术,它以定子电压空间矢量为定向,直接对电机定子磁链和转矩进行控制,具有转矩响应快、对电机参数依赖小的优点,但它的不足之处就是存在较大的转矩脉动。本文实现了以TMS320LF2407A DSP为控制核心、三相异步电机为对象的三电平直接转矩控制系统。在分析了异步电机数学模型、直接转矩控制原理以及转矩脉动特性的基础上,研究了几种适用于三电平拓扑减小转矩脉动的方法。最后,在MATLAB/SIMULINK仿真软件下建立了基于虚拟合成矢量控制的异步电机直接转矩控制系统仿真模型,先后对虚拟合成矢量方法、转矩预估测控制法、基于定子磁链幅值和相位补偿的转矩预估测控制法和离散占空比控制方法进行仿真研究,验证上述控制方法的正确性和有效性;并且基于TMS320LF2407A DSP设计控制电路,采用汇编语言编程,针对1.1kW异步电机,分别采用虚拟合成矢量方法、转矩预估测控制法和离散占空比控制方法进行直接转矩控制系统实验。仿真和实验结果表明,在相同的采样周期和磁链、转矩滞环宽度的情况下,与虚拟合成矢量方法相比,上述几种方法能够很好的减小转矩脉动,改善电机的性能。更多还原

【Abstract】 Direct torque control is another high performance control technique of AC motor, it adapt flux oriented control and transient space vector theory, directly control stator flux and torque, it has the advantage of rapid torque response and less relying on stator parameters, but has the disadvantage of bigger torque ripple.Direct torque control system which control core is TMS320LF2407A DSP and object is three-phase asynchronous motor is implemented in this paper. On the basis on analyzing of asynchronous motor, DTC principle and torque ripple characteristic, some methods for the topo of three-level that can reduce the torque ripple is researched.Finally, all the methods that based on synthesizing vectors , included synthesizing vectors control method, torque predictive control method, torque predictive control method based on the amplitude and phase compensation of the stator flux linkage, discrete duty ratio control technology are researched by MATLAB simulation; the control circuits based on TMS320 LF2407A are designed. Synthesizing vectors control method, torque predictive control method and discrete duty ratio control technology have been implemented on 1.1kW induction motor by assembly language. The simulation and experiment results prove that at the same sampling frequency and hysteresis width of stator flux and torque, comparing with synthesizing vectors control method, the methods which have been discussed can better reduce the torque ripple, improve the motor performance.更多还原