双馈电机双逆变器控制系统研究

发布时间：2018-05-05 17:48

本文选题：双逆变器 + 双电流环　；参考：《中国矿业大学》2016年硕士论文

【摘要】：随着电力传动和电力电子技术的不断发展,交流调速系统已取代直流调速系统成为工业生产和社会生活主要的传动方式。双馈电机作为一种特殊的异步电机,具有控制简单、调速范围宽、能量方便回馈等优点,应用在调速系统上具有巨大的潜力。本文在参阅了大量资料的基础上,研究了一种双馈电机双逆变器控制系统。该控制系统具有调速范围宽、定转子逆变器承担功率灵活可调、两逆变器互为备用,系统安全稳定性高等特点,适用于电动汽车等需要宽调速范围及高安全稳定性的场合。双馈电机为高阶、多变量、非线性系统,本文在研究双逆变器控制系统之前,首先对双馈电机的数学模型进行了详细的分析,并分别给出了双馈电机在两相同步旋转和静止坐标系下的数学模型。为减小双馈电机启动过程中的冲击电流,研究了基于定子磁链定向的转子初始位置角的观测方法,并推导了其表达式。深入分析了双馈电机双逆变器控制系统的原理。为实现定转子电流的独立控制和两逆变器功率的灵活可调,提出一种定转子逆变器双电流环控制策略;为进一步提高系统调速范围,进行了磁链控制器的设计。恒转矩控制时使系统在最大转矩电流比的状态下运行,恒功率控制时弱磁运行;为提高系统的安全可靠性,给出了双馈电机的单逆变器运行策略,使系统在发生单一逆变器故障时仍可稳定运行;研究了一种适用于双逆变器控制系统的转子初始位置角观测方法,有效减小了启动过程中的冲击电流;搭建了双逆变器系统的Matlab/Simulink仿真模型,对系统的宽调速范围、逆变器功率灵活可调、两逆变器互为备用等特性进行了验证,证明了策略的有效性。双馈电机的定转子侧电压电流均方便观测,为无速度传感器控制策略的设计提供了便利。本文比较了基于直接检测量的开环观测方案、基于定子电流的闭环控制方案和基于定子磁链的参考模型自适应速度观测方案优缺点,提出了基于定子磁链参考模型自适应的双逆变器无速度观测方案,并进行了其自适应律的推导。该方案能够对观测的转速误差进行修正,观测效果好,从而能够获得准确的速度信息,提高了调速系统的鲁棒性和可靠性。最后搭建了双馈电机双逆变器调速系统的实验平台,对上文所述的控制系统进行了验证。
[Abstract]:With the continuous development of power transmission and power electronics technology, AC speed regulation system has become the main transmission mode in industrial production and social life instead of DC speed regulation system. As a special asynchronous motor, doubly-fed machine has the advantages of simple control, wide speed range, convenient energy feedback and so on. It has great potential in speed regulation system. In this paper, a double-fed inverter control system is studied on the basis of a lot of data. The control system has the characteristics of wide speed range, flexible adjustable power of stator and rotor inverter, standby of two inverters, high safety and stability of the system, etc. It is suitable for electric vehicles which need wide speed range and high safety and stability. The doubly-fed machine is a high-order, multi-variable, nonlinear system. Before studying the control system of the double-fed inverter, the mathematical model of the double-fed machine is analyzed in detail. The mathematical models of doubly fed machine in two phase synchronous rotation and stationary coordinate system are given. In order to reduce the impulse current in the starting process of doubly-fed motor, the measurement method of rotor initial position angle based on stator flux orientation is studied, and its expression is derived. The principle of double inverter control system of doubly-fed machine is analyzed. In order to realize the independent control of the stator and rotor current and the flexible adjustment of the power of the two inverters, a dual current loop control strategy for the stator / rotor inverter is proposed, and the flux chain controller is designed to further improve the speed range of the system. In order to improve the safety and reliability of the system, the operation strategy of single inverter is given in order to improve the safety and reliability of the system, which makes the system run under the state of the maximum torque / current ratio and the weak magnetic field during the constant power control. The system can still operate stably when a single inverter fault occurs, and a new method of rotor initial position angle observation is studied, which can effectively reduce the impulse current in the starting process of the dual inverter control system. The Matlab/Simulink simulation model of the dual inverter system is built. The characteristics of the system such as wide speed range, flexible and adjustable power of the inverter, and the two inverters are used as backup are verified, and the effectiveness of the strategy is proved. The voltage and current on the stator and rotor sides of the doubly-fed machine are easy to observe, which provides convenience for the design of the speed sensorless control strategy. In this paper, the advantages and disadvantages of open-loop observation scheme based on direct detection, closed-loop control scheme based on stator current and adaptive velocity observation scheme based on stator flux reference model are compared. Based on the stator flux reference model, a speed free observation scheme for double inverters is proposed and its adaptive law is derived. This scheme can correct the rotational speed error, and the observation effect is good, thus the accurate velocity information can be obtained, and the robustness and reliability of the speed regulating system can be improved. Finally, the experiment platform of the double-fed inverter speed regulation system is built, and the control system is verified.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM464

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