永磁直线同步电机直接推力控制研究

发布时间：2018-03-14 19:05

本文选题：永磁直线同步电机　切入点：直接推力控制　出处：《沈阳工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：永磁直线同步电机（PMLSM）以其独特的优势在工业自动化、能源的开发、利用过程中的应用日益广泛，建立一个系统稳定性好，鲁棒性强的永磁直线同步电机控制机制已经成为电机控制领域的研究热点。直接推力控制以其新颖的控制思想，电机模型简单，控制方法直接等特点，越来越多的受到人们的关注。本文针对永磁直线同步电机直接推力控制进行了研究。首先，论文简单地梳理对直线电机的发展，随后介绍了永磁直线同步电机，归纳总结了PMLSM的结构和工作原理及控制策略，分析了PMLSM直接推力控制的发展现状；建立了PMLSM的数学模型，详细地介绍永磁直线同步电机直接推力控制理论，阐明直接推力控制的推力和磁链控制原理。其次，鉴于传统的直接推力控制系统脉动大，系统稳定性差以及响应慢的问题，本文给出一种改进的永磁直线同步电机直接推力控制方法。论文建立新的PMLSM数学模型，在定子磁链坐标系下建立电机模型，在此基础上对推力和磁链进行解耦控制。根据推力和负载角的线性关系设计推力调节回路，将推力和磁链的误差作为PI控制器的输入，利用定子磁链矢量角把产生的正交参考电压分量进一步转化到固定参考系下，采用空间电压矢量调制代替传统的开关表生成所需的电压矢量。磁链负载角和动子速度由磁链的正交分量计算得出，，不使用任何传感器。搭建仿真模型，对所建立的电机数学模型和直接推力控制方法进行验证，仿真结果表明，改进的直接推力控制可以得到快速、平滑的推力和磁链响应，提高了系统的控制性能，同时证明了新的永磁直线同步电机数学模型的正确性和可行性。最后，为了解决电机控制系统受参数摄动和负载扰动所带来的影响，并进一步降低磁链和推力脉动，提高系统动态响应性能和鲁棒性，在新的PMLSM状态模型的基础上，引入永磁直线同步电机滑模变结构直接推力控制策略，并搭建了控制系统仿真模型。仿真结果显示磁链误差基本稳定在零点，证明了系统的鲁棒性和抗干扰能力，系统响应快；同时，系统脉动问题得到了改善。
[Abstract]:PMLSM (permanent Magnet Linear synchronous Motor) has been widely used in industrial automation, energy development and utilization for its unique advantages. The robust control mechanism of permanent magnet linear synchronous motor (PMLSM) has become a research hotspot in the field of motor control. Direct thrust control (DTC) is characterized by its novel control idea, simple motor model, direct control method and so on. More and more people pay attention to the direct thrust control of permanent magnet linear synchronous motor (PMLSM). Firstly, the development of linear motor is simply combed, then the permanent magnet linear synchronous motor is introduced, the structure, working principle and control strategy of PMLSM are summarized, and the development status of PMLSM direct thrust control is analyzed. The mathematical model of PMLSM is established. The direct thrust control theory of permanent magnet linear synchronous motor is introduced in detail. The thrust and flux control principle of direct thrust control is expounded. Secondly, in view of the problems of large pulsation, poor stability and slow response of traditional direct thrust control system, an improved direct thrust control method for permanent magnet linear synchronous motor (PMLSM) is presented in this paper. A new PMLSM mathematical model is established in this paper. The motor model is established in the stator flux coordinate system, and then the thrust and flux are decoupled. According to the linear relation between thrust and load angle, the thrust regulating loop is designed, and the error between thrust and flux is taken as the input of Pi controller. By using stator flux vector angle, the generated orthogonal reference voltage component is further transformed into a fixed reference frame. The space voltage vector modulation is used to replace the traditional switching table to generate the required voltage vector. The load angle and the velocity of the flux are calculated by the orthogonal component of the flux chain, and no sensors are used to build the simulation model. The simulation results show that the improved direct thrust control can get fast and smooth thrust and flux response, and improve the control performance of the system. At the same time, the correctness and feasibility of the new mathematical model of permanent magnet linear synchronous motor are proved. Finally, in order to solve the problem that the motor control system is affected by parameter perturbation and load disturbance, and further reduce flux and thrust pulsation, and improve the dynamic response performance and robustness of the system, a new PMLSM state model is proposed. The direct thrust control strategy of permanent magnet linear synchronous motor with sliding mode variable structure is introduced, and the simulation model of the control system is built. The simulation results show that the flux error is basically stable at 00:00, which proves the robustness and anti-interference ability of the system and the fast response of the system. At the same time, the system pulsation problem is improved.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM341

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