The Sustainable Development Goal 7 necessitates efficient energy utilization and aligning energy efficiency targets to industrial machines would pave a way for prospective developments. Pumps are inevitable in commercial and industrial sectors and they contribute to nearly 22% of the global industrial energy utilization. Attesting the fact, this paper focuses on the energy-efficient operation of a pumping system by governing the speed using Variable Frequency Drives (VFDs). This is accomplished by modeling the pump performance curves by estimating the parameters like flow rate and pressure values for automatic adaptation in VFDs. With the aid of the manufacturers’ datasheet and the operating state of the pump, the pump performance curve is estimated automatically. The pump operating point is attained from pump parameters and motor rotational speed without using the sensors (sensor-less). This proposed methodology is validated through an experimental setup with a 1.1 kW Induction motor (IM) based centrifugal pump driven by 2.2 kW Danfoss VFD and the obtained results can be adopted for estimating the operating point of the centrifugal pumps throughout its operating range. Further, the variations in accuracy between actual and measured flow rate for the proposed scheme is found to be ranging from −5.29 GPM to 2.03 GPM which is about −0.243% to 0.0713%. Specifically, the pump flow rate estimation accuracy deviation is found to be between 2%–8% during lower operating flow rates and is within 2% during the higher operating region. Further, the proposed scheme offers better efficiency than the conventional sensor-based method which constitutes about 2% deviation in accuracy. Consequently, it empowers Industrial users to perform energy-efficient optimization for the cascade pumping system.

中文翻译：

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采用自动泵曲线自适应方法对基于变频驱动的复叠离心泵系统进行无传感器参数估计

可持续发展目标 7 要求高效利用能源，并将能源效率目标与工业机器相结合，将为未来的发展铺平道路。泵在商业和工业领域是不可避免的，它们占全球工业能源利用的近 22%。为了证明这一事实，本文重点关注通过使用变频驱动器 (VFD) 控制速度来实现泵送系统的节能运行。这是通过估计 VFD 中自动适应的流量和压力值等参数来对泵性能曲线进行建模来实现的。借助制造商的数据表和泵的运行状态，自动估算泵的性能曲线。泵的工作点是通过泵参数和电机转速获得的，无需使用传感器（无传感器）。该方法通过由 2.2 kW 丹佛斯 VFD 驱动的基于 1.1 kW 感应电机 (IM) 的离心泵的实验装置进行了验证，获得的结果可用于估计离心泵在其整个工作范围内的工作点。此外，发现该方案的实际流量和测量流量之间的精度变化范围为-5.29 GPM 至2.03 GPM，约为-0.243% 至0.0713%。具体而言，在较低运行流量期间，泵流量估算精度偏差在 2%–8% 之间，在较高运行流量范围内，偏差在 2% 以内。此外，所提出的方案比传统的基于传感器的方法提供了更好的效率，传统的基于传感器的方法的精度偏差约为 2%。因此，它使工业用户能够对复叠泵系统进行节能优化。