Direct Torque Control of an IPM-Synchronous Motor Drive at Very Low Speed Using a Sliding-Mode Stator Flux Observer
Direct Torque Control of an IPM-Synchronous Motor Drive at Very Low Speed Using a Sliding-Mode Stator Flux Observer
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DOI：
10.1109/tpel.2009.2036354
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发表时间：
2010-04
影响因子：
6.7
通讯作者：
G. Foo;M. F. Rahman
中科院分区：
文献类型：
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作者：
G. Foo;M. F. Rahman
众所周知，内置式永磁同步电机的直接转矩控制可以提供快速的转矩和磁链动态响应。然而，在非常低的速度下，较差的磁通估计一直是它的最大缺点。已有大量的磁通观测器被提出用于磁通估计，但大多数都不能在低速区域进行。本文提出了一种滑模定子磁链观测器，用于改进极低速时的磁链估计。与传统的磁链观测器不同，该观测器不需要任何速度自适应机制，不受速度估计误差的影响。在无位置传感器驱动系统中引入了一种新型的定子电阻估计器，以补偿定子电阻变化的影响。通过Lyapunov稳定性分析，保证了磁链观测器和定子电阻估计器的全局渐近稳定性。通过在观测器增益中引入一个小的积分分量来减轻直流偏置影响。仿真和实验结果证实了该方法在无信号注入的情况下的有效性。
Direct torque control of interior permanent-magnet synchronous motors is known to deliver fast torque and flux dynamic responses. However, the poor flux estimation at very low speeds has been its largest drawback. A multitude of flux observers have been proposed for flux estimation, but most of them fail to fare in the low-speed region. This paper proposes a sliding-mode stator flux observer for improved flux estimation at very low speeds. Unlike conventional flux observers, this observer does not require any speed adaptation mechanism and is immune to speed estimation error. A novel stator resistance estimator is incorporated into the sensorless drive to compensate the effects of stator resistance variation. Global asymptotic stability of both the flux observer and stator resistance estimator is guaranteed by the Lyapunov stability analysis. DC-offset effects are mitigated by introducing a small integral component in the observer gains. Simulation and experimental results at very low speeds, including 0 and 2 r/min, without signal injection confirm the effectiveness of the proposed method.