滑模控制方法在感应电机中的应用研究

发布时间：2018-05-04 03:12

本文选题：感应电机 + 非奇异终端滑模　；参考：《太原科技大学》2017年硕士论文

【摘要】：感应电机作为重要的动力装置已被大量应用于工业生产和日常生活中,随着社会的发展和科技水平的提高,人们对电机控制系统有着愈加苛刻的要求。但由于感应电机本身多变量、强耦合的特性和复杂的外部工作环境等不利因素,导致传统控制方法难以满足控制要求。滑模控制因其鲁棒性强等优点,在交流调速系统中有着巨大的应用空间,本文在终端滑模控制理论基础上,针对其存在的问题和不足提出改进方案,分别设计了速度观测器和速度控制器,以获得对感应电机更加优良的控制效果。具体研究内容如下:首先,为了实现感应电机无速度传感器控制,设计了定子电流观测器,采用非奇异快速终端滑模方法减小了误差变量收敛时间和稳态误差,然后通过磁链和转速计算环节得到磁链和转速的观测值。仿真结果验证了该观测器的有效性。其次,针对无传感器感应电机矢量控制系统,研究了一种全局非奇异终端滑模控制器,解决了传统滑模在系统状态到达切换面之前鲁棒性弱的问题,同时保证了系统能在有限时间内收敛,增强了系统抗干扰能力。最后,以TMS320F28335型号的DSP为核心处理器,搭建了包括电源电路、驱动电路、IPM、采样电路、信号调理电路的硬件实验平台,并在CCS3.3开发环境下设计编写了包括电流控制、速度控制、坐标变换、SVPWM等矢量控制技术的源程序,将本文设计的终端滑模控制器替代传统的速度环PI控制器,在此控制实验平台上进行实验验证,实验结果证明了理论研究的正确性和有效性。
[Abstract]:Induction motor as an important power device has been widely used in industrial production and daily life. With the development of society and the improvement of science and technology, people have more and more stringent requirements for motor control system. However, the traditional control methods are difficult to meet the control requirements due to the disadvantages of the induction motor itself, such as multivariable, strong coupling characteristics and complex external working environment. Sliding mode control has great application space in AC speed regulation system because of its strong robustness and so on. Based on the theory of terminal sliding mode control, this paper puts forward an improved scheme aiming at its existing problems and shortcomings. A speed observer and a speed controller are designed to obtain better control effect on induction motor. The specific research contents are as follows: firstly, in order to realize sensorless control of induction motor, stator current observer is designed. The convergence time of error variable and steady-state error are reduced by using nonsingular fast terminal sliding mode method. Then the flux and rotational speed are measured by flux and speed calculation. Simulation results verify the effectiveness of the observer. Secondly, for the sensorless induction motor vector control system, a global nonsingular terminal sliding mode controller is studied, which solves the problem of weak robustness of the traditional sliding mode before the system state reaches the switching surface. At the same time, the system can converge in limited time and enhance the anti-interference ability of the system. Finally, a hardware experimental platform including power supply circuit, driving circuit, sampling circuit and signal conditioning circuit is built based on TMS320F28335 model DSP as the core processor. In the CCS3.3 development environment, the design includes current control and speed control. In the source program of vector control technology such as coordinate transformation and SVPWM, the terminal sliding mode controller designed in this paper is replaced by the traditional speed loop Pi controller, and the experimental verification is carried out on this control experimental platform. The experimental results show that the theoretical research is correct and effective.
【学位授予单位】：太原科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM346

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