改进滑模观测器的CSI驱动PMSM无位置传感器控制

doi:10.19595/j.cnki.1000-6753.tces.222146

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摘要

由于电流源逆变器的叠流效应以及前级DC-DC控制的母线电流脉动较大,使得扩展反电动势中含有大量谐波,造成较大的位置误差。针对此问题,该文提出一种改进滑模观测器的电流源逆变器驱动永磁同步电机无传感器控制方法。首先,基于传统滑模观测器,设计复系数滤波器代替传统低通滤波器,实现了对估计反电势的准确提取,同时也抑制了估计反电势中的高频抖动和高次谐波。其次,将二阶广义积分器内嵌于锁相环中,用于消除位置误差信号中的低次谐波,提高位置观测精确度。最后,将估算的速度信息反馈回复系数滤波器,实现复系数滤波器的自适应性。实验结果表明,所提方法在不同工况下,能够有效提高估算的转子位置精度,验证了方法的可行性与有效性。

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	赵文祥
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关键词 ：永磁同步电机, 电流源逆变器, 改进滑模观测器, 复系数滤波器, 无位置传感器控制

Abstract：

Due to the overlap effect of the current source inverter and the large current pulsation of the bus controlled by the front DC-DC, a large number of harmonics are contained in the extended back electromotive force, resulting in large position errors, which in turn affect the performance of the system. To solve this problem, this paper proposes a sensorless control method of permanent magnet synchronous motor driven by current source inverter with improved sliding mode observer. The proposed method can effectively reduce the harmonic distortion of the estimated back electromotive force caused by the overlapping current effect and the large busbar current pulsation. It not only reduces the position error and speed pulsation, but also has good dynamic performance.
Firstly, based on the traditional sliding mode observer, the voltage model of permanent magnet synchronous motor is established under the α-β stationary coordinate system, and the observer is constructed according to the voltage model. The chattering of the system is reduced by using saturation function instead of sign function in the ideal sliding mode. Since the traditional sliding mode observer uses a first-order low-pass filter to filter the observed back electromotive force, the phase lag and amplitude attenuation problems will be caused, and there are still a large number of high-frequency chattering components in the observed back electromotive force. To solve this problem, a complex coefficient filter is designed to replace the traditional low-pass filter. By using the complex coefficient filter's characteristics of no phase delay and amplitude attenuation at the center frequency, the estimated back potential can be accurately extracted, and the phase lag and amplitude attenuation problems can be avoided while chattering is suppressed. At the same time, the velocity information estimated by the phase-locked loop is fed back to the coefficient filter to realize the adaptability of the complex coefficient filter.
Secondly, although the complex coefficient filter can effectively filter out part of the 5th and 7th harmonics in the observed back electromotive force, there are still part of the 5th and 7th harmonics in the position error signal, and then form the 6th position error signal to affect the position observation accuracy. To solve this problem, the second order generalized integrator is embedded in the phase-locked loop, and the notch property is used to eliminate the sixth harmonics in the position error signal to further improve the position observation accuracy. At the same time, the reference speed is introduced into the phase-locked loop to improve the convergence speed of the phase-locked loop and improve the dynamic performance of the system.
Finally, the experimental results show that compared with the traditional sliding mode observer, the estimated back electromotive force harmonic distortion of the proposed strategy is reduced from 8.9% to 4.12%, and the stator current harmonic distortion is reduced from 8.25% to 6.87%. The rotor position error is reduced by 25% and the rotational speed error by 30%. The results show that the proposed method can better reduces the harmonic disturbance in the estimated back electromotive force, reduces the speed pulsation and position error, improves the estimation accuracy, and has good dynamic performance.

Key words： Permanent magnet synchronous motor current source inverter improved sliding mode observer complex coefficient filters sensorless control

PACS:

TM315

基金资助:

国家杰出青年科学基金（52025073）

作者简介: 赵文祥男,1976年生,教授,博士生导师,研究方向为电机及其控制。E-mail: zwx@ujs.edu.cn; 宋世昌男,1997年生,硕士研究生,研究方向为永磁电机的驱动控制。E-mail: 952464769@qq.com

引用本文:

赵文祥, 宋世昌, 周书文, 陶涛. 改进滑模观测器的CSI驱动PMSM无位置传感器控制[J]. 电工技术学报, 0, (): 20235422-20235422. Zhao Wengxiang, Song Shichang, Zhou Shuwen, Tao Tao. Sensorless Control of CSI Driven PMSM with Improved Sliding Mode Observer. Transactions of China Electrotechnical Society, 0, (): 20235422-20235422.

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