基于高阶滑模方法的PMSM系统关键问题研究

发布时间：2018-01-07 04:41

本文关键词：基于高阶滑模方法的PMSM系统关键问题研究　出处：《太原科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：永磁同步电机(Permanent-magnet synchronous motor,PMSM)由于其优越性能被广泛的应用于国民经济的各个方面。电机控制性能的提升、硬件成本的降低以及在某些特殊场合下的应用一直是永磁同步电机控制领域需要解决的关键问题。本文利用高阶滑模理论对无位置传感器技术以及逆变器谐波抑制技术两个方面展开研究。针对传统的滑模观测器中电机转子位置和速度的观测精度较低的问题,本文提出一种高阶终端滑模观测器的观测方法。该方法利用高阶滑模技术抑制滑模抖振现象,观测器的输出可以直接用于计算电机的位置和速度信息,避免了传统滑模观测器由于低通滤波引起的相位延迟问题。仿真结果表明,所设计的观测器能过获得满意的观测性能。在永磁同步电机控制系统中,由于存在死区效应和开关器件的导通压降等逆变器非线性因素,导致电机定子电流矢量发生畸变,产生大量高次谐波,进而影响系统的动态性能。针对这一问题,本文提出了基于广义陷波器的谐波抑制方法,通过陷波器滤除指定的定子电流谐波分量,从而抑制逆变器非线性因素对控制系统的不利影响。在此基础上,为解决PMSM系统电流环内存在电流周期性扰动问题,本文利用高阶滑模技术设计电流控制器,提高了控制系统对电流周期扰动的鲁棒性,同时削弱传统滑模不连续控制带来的高频抖振现象。仿真结果表明,所设计的陷波器可以有效的降低电机控制系统内谐波的总量,明显改善电流波形的正弦度,电流控制器可以有效的提高系统的抗干扰能力。
[Abstract]:Permanent-magnet synchronous motor. PMSM) is widely used in all aspects of national economy because of its superior performance. The reduction of hardware cost and its application in some special cases have been the key problems in the field of PMSM control. In this paper, the high order sliding mode theory is used to suppress the harmonics of sensorless technology and inverter. Aiming at the problem of low accuracy of rotor position and speed in the traditional sliding mode observer. In this paper, a high order terminal sliding mode observer is proposed, which uses high order sliding mode technique to suppress the chattering phenomenon of sliding mode. The output of the observer can be directly used to calculate the position and velocity information of the motor. The phase delay problem caused by low-pass filtering is avoided. The simulation results show that the designed observer can obtain satisfactory observation performance in PMSM control system. Because of the nonlinear factors such as dead-time effect and on-on voltage drop of switching devices, the stator current vector of the motor is distorted and a large number of high-order harmonics are generated. Then the dynamic performance of the system is affected. In order to solve this problem, this paper proposes a harmonic suppression method based on generalized notch filter, through which the specified stator current harmonic components are filtered. On the basis of this, the problem of periodic disturbance of current in the current loop of PMSM system is solved. In this paper, the high order sliding mode technique is used to design the current controller, which improves the robustness of the control system to the current period disturbance and weakens the high frequency buffeting caused by the traditional sliding mode discontinuous control. The designed notch filter can effectively reduce the total harmonics in the motor control system and obviously improve the sinusoidal degree of the current waveform. The current controller can effectively improve the anti-interference ability of the system.
【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

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