【作者】 陶一凤；

【导师】 林忠岳；

【作者基本信息】 广西大学 ， 控制理论与控制工程， 2004， 硕士

【摘要】 直接转矩控制采用电压空间矢量的概念来分析异步电机的数学模型和控制其物理量，直接在定子坐标系下计算和控制其各物理量，借助于离散的调节器产生PWM信号，直接对逆变器的开关状态进行控制，以获得转矩的高动态性能。 直接转矩控制作为一种转矩响应快高性能的交流调速系统，低速时仍然存在磁通偏差和转矩脉动现象。针对上述问题，本文采用SVPWM空间电压矢量细分、三点式调节器对系统低速性能进行改进，并对磁链进行低通滤波和转矩滑动滤波等措施，以提高系统的性能。 利用波波夫超稳定性理论设计自适应系统的基本思想，设计模型参考自适应的速度估算算法。运用转子磁场下的反电势计算模型，将不含转速信息的反电势模型作为参考模型，含有转速信息的反电势模型作为受控模型，在系统中采用该方法进行了无速度传感器的速度闭环控制。 以TMS320F240 DSP芯片为主控核心，采用汇编语言编制了系统控制软件，实现了无速度传感器直接转矩控制算法。实验结果表明系统性能稳定，具有一定的使用价值。更多还原

【Abstract】 In direct torque control (DTC) system, the concept of space vector is used to analyze the mathematic model of AC motor, the electromagnetic torque and flux are caculated and controlled in the stator reference frame, and the optimal PWM gating signals are generated to control the inverter according to the output of the dispersing regulator.The DTC technology is a high-performance speed method with fast torque response, while there are some questions, such as flux drift and torque ripple. To resolve these trouble, SVPWM subdividing voltage space-vector and tri-nod regulator and some measures such as stator’ flux LPF, torque slide filtering are adopted. By these controls, the performance of system is improvedUsing Popov’s criteria for hyperstability for designing a self-adaptive system, we devise a method to estimate the rotor speed based on MARS. The counter-electromotive force’s observer with no speed’s information can be regarded as a reference model of induction motor, while the counter-electromotive force’s observer with speed’s information is taken as an adjustable model. Taking into account the good convergence property and implementation in real system, we choose the MRAS as the close-loop of speed’s measure to continue our experimentin real control system.The system software is designed in assemble language based on the TMS320F240 to implement the no sensor DTC algorithm. The experimental results indicate that the system has stable performance , so to some extent it is practical useful system.更多还原