永磁同步电机滑模控制方法研究

发布时间：2018-08-02 15:24

【摘要】：永磁同步电机因构造简单,功率密度高,功耗低等突出优点引起了越来越多的关注,已被广泛应用于实际工程领域。众多学者越来越重视永磁同步电机的直接转矩控制,因为它控制方法简单、响应快以及鲁棒性强。本文介绍了永磁同步电机滑模变结构在直接转矩系统中的应用现状,并针对其中存在的转矩和磁链脉动较大、鲁棒性不强等问题,进行了改进,主要内容如下:首先,针对传统直接转矩控制转速换采用的PI控制器而导致的系统无法在有限时间内跟踪给定转速及直接转矩固有的磁链和转矩波动较大的问题,提出一种非奇异终端模糊滑模控制器以代替PI控制器,详细叙述了该方法的实现过程;其次,针对内环输出参考电压矢量精确度较低的问题,提出一种分数阶非奇异终端滑模控制器以代替空间电压矢量调制的直接转矩控制方法中参考电压矢量,并通过仿真证明该方法进一步减小了转矩和磁链波动,且有效提高系统的动静态性能;最后,为有效降低转矩和磁链波动,根据全局快速终端滑模控制方法和分数阶微积分理论,设计一种基于分数阶滑模转速控制器,仿真结果表明,该方法比前两种更有效减小转矩和磁链波动,且能保证转速的快速跟踪性。
[Abstract]:Permanent magnet synchronous motor (PMSM) has attracted more and more attention because of its simple structure, high power density and low power consumption. It has been widely used in practical engineering fields. Many scholars have paid more and more attention to direct torque control of permanent magnet synchronous motor because of its simple control method, fast response and strong robustness. This paper introduces permanent magnet synchronous electricity. The current situation of the application of sliding mode variable structure in direct torque system is made, and the main contents are as follows: first, the system can not track a given speed in a limited time for the PI controller used in the traditional direct torque control speed control. A kind of non singular terminal fuzzy sliding mode controller is proposed to replace the PI controller. The realization process of this method is described in detail. Secondly, a fractional order nonsingular terminal sliding mode controller is proposed to replace the space of the inner ring output reference voltage vector. In the direct torque control method of the VVM modulation, the reference voltage vector is used, and the simulation proves that the method further reduces the torque and flux fluctuation and improves the dynamic and static performance of the system. Finally, in order to effectively reduce the torque and flux fluctuation, the global fast terminal sliding mode control method and the fractional calculus theory are set up. A fractional sliding mode speed controller based on a fractional order is proposed. The simulation results show that the method is more effective than the first two kinds of torque and flux fluctuation, and can ensure fast tracking of the speed.
【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】：TM341;TP273

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