基于复合转速估计的永磁同步电机容错控制策略

发布时间：2018-06-15 07:20

本文选题：IPMSM + 矢量控制　；参考：《电子科技大学》2014年硕士论文

【摘要】：永磁同步电机广泛应用于生活中的各个领域,在采用矢量控制的驱动控制系统中多使用位置传感器定向转子磁场位置、计算转速。但由于安装、环境等各方面因素的影响导致的位置传感器故障,会造成系统停机等严重后果,在某些应用领域需要使用位置传感器容错控制对故障进行处理。因此,研究永磁同步电机驱动系统位置传感器的容错控制具有重要意义。在位置传感器故障的容错控制领域,无位置传感器算法等软件容错方法是当前的研究热点,本文针对位置传感器断路、码道故障,在永磁同步电机矢量控制的基础上,重点研究了无位置传感器转子位置估计算法、基于限幅值滤波器的码道故障容错方法以及基于后验概率的断路故障的容错方法。主要研究内容在于:1.研究永磁同步电机的数学模型,以及矢量控制算法,且通过仿真分析不同位置传感器故障类型对系统的影响。2.针对各无位置传感器转子位置估计算法难以在全速段准确辨识转速的问题,采用将模型参考自适应法(MRAS)法和高频注入法相结合的方法,通过量化两种算法在全速段的估计准确度,将其分别用作高速段和低速段的转子位置估计,仿真结果表明这种方法达到了在全速段实现转子位置准确估计的效果。3.位置传感器断路故障后,反馈转速由位置传感器采集位置所得转速开关切换至估计转速时,会造成系统振荡甚至发散。本文研究了一种基于后验概率复合转速的断路故障容错控制方法,并针对该方法中先验概率值,提出了一种基于极大似然投票的计算方法,通过仿真与实验表明,该断路故障容错控制方法能有效抑制开关切换造成的系统振荡,使系统在故障点的过渡更平稳。4.针对位置传感器码道故障的容错控制策略的设计,本文采用限幅值滤波器过滤数据坏点,消除码道故障引起的系统波动。并提出了一种最大限幅周期值的整定方法,以最大限幅周期值为阀值,进行故障类型判断,以此设计了综合容错控制策略,最终通过仿真与实验验证了该综合容错控制方法对位置传感器多类故障的检测与容错的可行性与有效性。基于simulink仿真与1.1kW内埋式永磁同步电机实验,验证了本文的容错控制策略能够正确检测出位置传感器断路及码道故障,有效抑制码道故障造成的系统波动,在断路故障后亦能够继续稳定运行,且故障前后过渡平稳。
[Abstract]:Permanent magnet synchronous motor (PMSM) is widely used in all fields of life. In the drive control system using vector control, a position sensor is used to orientate the rotor's magnetic field position and calculate the speed of the rotor. However, the position sensor failure caused by the influence of various factors such as installation and environment will result in serious consequences such as system shutdown and some applications. The fault tolerant control of the position sensor is needed in the field. Therefore, it is of great significance to study the fault tolerant control of the position sensor of the permanent magnet synchronous motor drive system. On the basis of the vector control of permanent magnet synchronous motor, the rotor position estimation algorithm for sensorless sensor, fault tolerance method based on the amplitude limiting filter and the fault tolerance method based on the posterior probability are studied. The main research contents are as follows: 1. the mathematical model of permanent magnet synchronous motor is studied. And the vector control algorithm, and through the simulation analysis of the influence of different position sensor fault types to the system.2., aiming at the problem that the rotor position estimation algorithm of each position sensor is difficult to identify the speed accurately in the full speed section, the method of combining the model reference adaptive method (MRAS) method and high frequency injection method is adopted to quantify two kinds of calculation. The estimation accuracy of the method at the full speed section is used as the rotor position estimation of the high speed and low speed segments. The simulation results show that this method achieves the accurate estimation of the rotor position at the full speed section. After the.3. position sensor is broken down, the feedback speed is switched to the estimated rotation from the position sensor acquisition position to the estimated rotation. In this paper, a fault tolerant control method based on the posterior probability compound rotational speed is studied, and a method based on maximum likelihood voting is proposed for the prior probability value in this method. The simulation and experiment show that the fault tolerant control method can effectively suppress the open fault. The system oscillation caused by switch off makes the transition of the system more stable in the fault point and the design of the fault tolerant control strategy for the position sensor code channel fault. In this paper, the limit amplitude filter is used to filter the bad points of the data and eliminate the system fluctuation caused by the code fault. A method of setting the maximum amplitude cycle value is proposed, with the maximum limit cycle of the.4.. The period value is the threshold value and the fault type is judged, and a comprehensive fault tolerant control strategy is designed. Finally, the feasibility and effectiveness of the integrated fault tolerant control method for detecting and fault-tolerant position sensor fault detection and fault tolerance are verified by simulation and experiment. Based on the Simulink simulation and the 1.1kW embedded permanent magnet synchronous motor experiment, the paper validates this paper. The fault tolerant control strategy can correctly detect the fault of the position sensor circuit breaker and the code channel, effectively suppress the system fluctuation caused by the code fault, and can continue to run steadily after the breakdowns, and the transition is stable before and after the fault.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM341

【参考文献】