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首页> 外文期刊>CES Transactions on Electrical Machines and Systems >Comparative study of low-pass filter and phase-locked loop type speed filters for sensorless control of AC drives
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Comparative study of low-pass filter and phase-locked loop type speed filters for sensorless control of AC drives

机译：低通滤波器和锁相环型速度滤波器用于交流驱动器无传感器控制的比较研究

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摘要

High quality speed information is one of the key issues in machine sensorless drives, which often requires proper filtering of the estimated speed. This paper comparatively studies typical low-pass filters (LPF) and phase-locked loop (PLL) type filters with respect to ramp speed reference tracking and steady-state performances, as well as the achievement of adaptive cutoff frequency control. An improved LPF-based filter structure with no ramping and steady-state errors caused by filter parameter quantization effects is proposed, which is suitable for applying LPF for sensorless drives of AC machines, especially when fixed-point digital signal processor is selected e.g. in mass production. Furthermore, the potential of adopting PLL for speed filtering is explored. It is demonstrated that PLL type filters can well maintain the advantages offered by the improved LPF. Moreover, it is found that the PLL type filters exhibit almost linear relationship between the cutoff frequency of the PLL filter and its proportional-integral (PI) gains, which can ease the realization of speed filters with adaptive cutoff frequency for improving the speed transient performance. The proposed filters are verified experimentally. The PLL type filter with adaptive cutoff frequency can provide satisfactory performances under various operating conditions and is therefore recommended.
机译：高质量的速度信息是机器无传感器驱动器中的关键问题之一，这通常需要对估计速度进行适当的过滤。本文针对斜坡速度参考跟踪和稳态性能以及自适应截止频率控制的实现，对典型的低通滤波器（LPF）和锁相环（PLL）型滤波器进行了比较研究。提出了一种改进的基于LPF的滤波器结构，该滤波器结构没有由滤波器参数量化效应引起的斜坡和稳态误差，适合于将LPF用于交流电机的无传感器驱动，尤其是在选择定点数字信号处理器时（例如）。在批量生产中。此外，还探讨了采用PLL进行速度滤波的潜力。事实证明，PLL型滤波器可以很好地保持改进的LPF所提供的优势。此外，发现PLL型滤波器在PLL滤波器的截止频率与其比例积分（PI）增益之间表现出几乎线性的关系，这可以简化具有自适应截止频率的速度滤波器的实现，从而改善速度瞬态性能。提出的过滤器通过实验验证。具有自适应截止频率的PLL型滤波器可以在各种工作条件下提供令人满意的性能，因此建议使用。

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