【作者】 李强；

【导师】 周少武；

【作者基本信息】 湖南科技大学 ， 控制理论与控制工程， 2007， 硕士

【摘要】 随着新一代电力电子器件和微处理器的推出及各种先进的控制策略的提出,极大的促进了交流电机调速控制系统的发展,使得精度高、调速范围宽、控制性能好的电机控制器的实现成为可能。矢量控制是基于电机理论、机电能量转换原理及坐标变换理论的基础上发展起来的,它的控制思想就是将异步电机转换成直流电动机来进行控制。即通过坐标变换,将定子电流矢量分解为按转子磁场定向的两个直流分量并分别加以控制,从而实现磁通和转矩的解耦控制,达到直流电机的控制效果甚至更优。因此,矢量控制技术已被广泛地应用于高性能异步电机调速系统中。首先在异步电动机数学模型的基础上,介绍了矢量控制理论及其解耦原理。将异步电动机三相静止坐标系下的数学模型变换到两相旋转坐标系下,再利用转子磁场定向技术,使得定子绕组电流的磁场分量和转矩分量得到解耦,从而实现异步电机的调速。结合电流模型给出了矢量控制系统结构框图,为构建SVPWM矢量控制系统提供了理论依据。并根据电压空间矢量脉宽调制工作原理,设计出了一种SVPWM的软件实现方法。针对异步电机非线性、强耦合和参数时变及系统要求快速响应的特点,设计的矢量控制系统的电流控制器采用模糊自整定PI控制算法,速度控制器采用模糊因子自调整算法构成双闭环智能控制系统来对电机进行有效的调速控制。然后,应用矢量控制的原理,以TI公司数字信号处理器TMS320F2407A为系统的控制核心,以SKBPC3512为整流器,以三菱公司的PM25RLA120智能功率模块为逆变器,采用空间电压矢量脉宽调制技术,设计了数字化脉宽调制调速系统,构建了一个基于DSP的异步电动机矢量控制系统。论文详细设计了系统的主电路、控制电路及保护电路等,采取有效而必要的措施提高系统的抗干扰能力,采用模块化方法设计软件,便于程序的修改与移植,实现了SVPWM矢量控制策略,最后对该系统的软硬件进行了调试。实验结果表明了软硬件设计合理性和实用性。最后,利用MATLAB中的SIMULINK模块对控制算法进行了仿真研究,从仿真结果可以看出,本文的控制策略设计简单,满足了系统转矩响应的快速性和速度控制精度的要求,对转子参数的扰动具有较好的鲁棒性,使得系统的动静态性能良好,满足工程要求。更多还原

【Abstract】 With the appearance all kinds of the new electronic power device and microprocessor and the advanced controlling theories be presented, which have greatly promoted the development of AC motor speed control system. The AC motor’s controller which haves high accuracy, wide speed range and good performance of controlling can be realized. Vector Control is based on the theory developed of the electrical, electromechanical energy conversion principle and vector coordinate transformation. Its thought of controlling is converting asynchronous motors as DC motor to control or even better. Through the coordinate transformation, the stator current vector is decomposing two DC parts which orientated as the rotator magnetic field and controlled respectively. Thus magnetic flux and torque are decoupled. It controls the asynchronous motor as a synchronous way. Therefore, the vector control technology has been widely used in high-performance asynchronous motor speed control system.First of all, the vector control theory and its decoupling are introduced on the foundation of the mathematical model of asynchronous motor. The variables in 3-phase static coordinates are converted into the variables in 2-phase rotating coordinates and the components between torque and magnetic field of stator winding current are decoupled which uses the rotor-field-oriented technology. Thus, the asynchronous motor speed control is achieved. The structure diagram of vector control system which combines the current model of motor is given and provides the theoretical basis for the design of SVPWM vector control system. Based of SVPWM principle, the SVPWM software was designed. Asynchronous motors control systems have the characteristics of Nonlinear, strong coupling, parameters-varying and rapid response. the design of vector control systems’ current controller using fuzzy-PI control algorithm, speed controller using fuzzy factor self-adjusting algorithm constitute double loop intelligent control systems to effectively control motor speed.Secondly, application of the principle of vector control, using digital single processor TMS320LF2407 of TI, which is special for motor control, as the core of system, using SKBPC3512 as the rectifier, using the intelligent power module PM25RLA120 of Mitsubishi Corporation as the inverter, using space voltage pulse width modulation technology, design digital PWM speed control system and construct an asynchronous motor for the vector control system based on DSP. In this paper, the main circuit, control circuit and protective circuit are designed in detail. In order to improve the capability of Anti-jamming, valid measures are taken. The modularization design is adopted in software so that it can be amended and replanted easily. The SVPWM vector control strategy is carried out. At last, the hardware and software is debugged. The experiment results expressed that the design of hardware and software in this paper is reasonable and valid.Finally, the controller is simulated respectively with the SIMULINK. module in the MATLAB. From the simulation results, the control strategy of this paper not only designs easily and avoids the restriction from the complex mathematical model of the controlled object, but also the rapidness of the system torque response and the control accuracy of speed are improved. It also has the good robustness against the perturbation of the rotor parameter. Thus, the static and dynamic characteristics of the system are ensured validly, which satisfy the requirement of engineering.更多还原