PMSM电流预测控制死区补偿技术研究

发布时间：2018-04-17 05:09

本文选题：永磁同步电机 + 电流预测控制　；参考：《哈尔滨工业大学》2016年硕士论文

【摘要】：电流预测控制是近年来研究的热点内容之一。和传统的控制方法一样,在电流预测控制中,为防止逆变器同一相的上、下两个功率管直通短路,必须加入若干死区时间,此外,功率管开通与关断时,均有一定延时,所以理想的驱动信号和给到功率管的实际驱动信号之间有误差存在,这个偏差使逆变器输出电压基波幅值减小,相电流出现畸变,总谐波含量变大,转矩出现脉动现象,尤其在电机速度较低和负载较轻时,更为明显。为了消除死区带来的影响,进一步改善系统性能,必须采取措施对死区效应进行抑制。本文首先分析了直接预测控制和PWM预测控制中死区效应,通过分析明确了无调制模块和有调制模块时死区效应的异同。然后分析了电流预测控制的机理,在PWM预测控制原理的基础上,提出一种自适应死区补偿法,并将其拓展到直接预测控制中。其次在直接预测控制中,对本文提出的补偿法进行了simulink仿真分析,得知所提出的方法拓展到直接预测控制中后,也能有效抑制死区效应。又在PWM预测控制中对提出死区补偿法和传统的时间补偿法进行了仿真对比研究,得知提出的方法和时间补偿法均能够有效抑制PWM预测控制中的死区效应,并通过在线变速方案证明,转速发生变化时,提出的方法能够做到自适应死区补偿,具有自适应性,而时间补偿法则无法做到自适应补偿。最后在对拖加载实验平台上进行了实验验证,在实现本文提出的死区补偿方法和时间补偿法的基础上,对两种方法法进行对比研究。实验结果证明,本文提出的方法和时间补偿法均能够有效抑制PWM预测控制中的死区效应,而且本文提出的方法能够实现自适应死区补偿。
[Abstract]:Current predictive control is one of the hot topics in recent years.As with the traditional control method, in the current predictive control, in order to prevent the next two power transistors from short-circuiting in the same phase, some dead-time must be added. In addition, when the power tube is turned on and off, there is a certain delay.So there is an error between the ideal driving signal and the actual driving signal given to the power transistor. This deviation reduces the fundamental amplitude of the output voltage of the inverter, distorts the phase current, increases the total harmonic content, and the torque ripples.Especially when the motor speed is lower and the load is lighter, it is more obvious.In order to eliminate the effect of dead zone and improve the system performance, measures must be taken to suppress the dead zone effect.In this paper, the dead-time effects in direct predictive control and PWM predictive control are analyzed.Then, the mechanism of current predictive control is analyzed. Based on the principle of PWM predictive control, an adaptive dead-time compensation method is proposed and extended to direct predictive control.Secondly, in the direct predictive control, the compensation method proposed in this paper is simulated by simulink, and it is found that the proposed method can effectively suppress the dead-time effect when it is extended to the direct predictive control.In the PWM predictive control, the dead zone compensation method and the traditional time compensation method are simulated and compared. The results show that both the proposed method and the time compensation method can effectively suppress the dead-time effect in the PWM predictive control.It is proved by the on-line speed changing scheme that the proposed method can achieve self-adaptive dead-time compensation when the rotational speed changes, but the time compensation rule can not achieve adaptive compensation.Finally, the experimental results are verified on the drag-load experimental platform. On the basis of realizing the dead-time compensation method and the time compensation method proposed in this paper, the two methods are compared and studied.The experimental results show that both the proposed method and the time compensation method can effectively suppress the dead-time effect in PWM predictive control, and the proposed method can realize adaptive dead-time compensation.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM464

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