Sensorless control of surface mounted permanent magnet machine using fundamental PWM excitation
Sensorless control of surface mounted permanent magnet machine using fundamental PWM excitation
复制标题
使用基本 PWM 励磁对表面安装永磁电机进行无传感器控制
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Yahan Hua
中科院分区：
文献类型：
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作者：
Yahan Hua
本论文旨在发展一种表面贴装式永磁同步电机驱动系统的无位置传感器控制方法。从定子电流瞬态响应到基本空间矢量PWM（脉冲宽度调制）激励跟踪电机中的饱和凸极。转子位置和速度信号是从在正常基波PWM序列中包含的电压矢量期间的定子电流导数的测量获得的。
原则上，该方案可以在宽的速度范围内工作。然而，在窄电压矢量期间进行的电流导数测量的精度降低。这是因为高频电流振荡存在于每个矢量切换瞬间之后，并且这些振荡需要有限的时间来平息。因此，在这篇论文中，提出了矢量扩展和补偿方案，确保正确的电流导数测量，即使在窄电压矢量，使任何感应的额外电流失真保持在最低限度。
研究了交流传动系统中高频开关振荡的原因，并提出了几种减小这些振荡影响的方法。其中包括对IGBT栅极驱动电路进行新的修改，以降低对PWM矢量扩展的要求。通过修改电流导数传感器设计及其相关的信号处理电路来进行进一步的改进。为了消除其他谐波干扰和高频噪声出现在估计的位置信号，自适应扰动识别器和跟踪观测器，以改善的位置和速度信号。实验结果表明，最终的无速度传感器控制系统可以实现良好的速度和位置控制性能。
This thesis describes the development of a sensorless control method for a surface mounted permanent magnet synchronous machine drive system. The saturation saliency in the machine is tracked from the stator current transient response to the fundamental space vector PWM (pulse width modulation) excitation. The rotor position and speed signals are obtained from measurements of the stator current derivative during the voltage vectors contained in the normal fundamental PWM sequence.
In principle, this scheme can work over a wide speed range. However, the accuracy of the current derivative-measurements made during narrow voltage vectors reduces. This is because high frequency current oscillations exist after each vector switching instant, and these take a finite time to die down. Therefore, in this thesis, vector extension and compensation schemes are proposed which ensure correct current derivative measurements are made, even during narrow voltage vectors, so that any induced additional current distortion is kept to a minimum.
The causes of the high frequency switching oscillations in the AC drive system are investigated and several approaches are developed to reduce the impact of these oscillations. These include the development of a novel modification to the IGBT gate drive circuit to reduce the requirement for PWM vector extension. Further improvements are made by modifications to the current derivative sensor design together with their associated signal processing circuits. In order to eliminate other harmonic disturbances and the high frequency noise appearing in the estimated position signals, an adaptive disturbance identifier and a tracking observer are incorporated to improve the position and speed signals. Experimental results show that the final sensorless control system can achieve excellent speed and position control performance.