Sensorless Control of a Linear Generator for Energy Harvesting Applications
Sensorless Control of a Linear Generator for Energy Harvesting Applications
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DOI：
10.1109/ldia.2019.8770976
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
A. Bodrov;Min Zhang;R. Shuttleworth;M. Iacchetti
中科院分区：
文献类型：
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作者：
A. Bodrov;Min Zhang;R. Shuttleworth;M. Iacchetti
直线发电机是实现往复式原动机(如斯特林、热声发动机和波能转换器)电能转换的关键部件。直线发电机的控制通常与瞬时转速同步，瞬时转速设定了最佳电流的基准--通常与转速同相。然而，测量速度通常是具有挑战性的，因为直线交流发电机位于密封的加压容器中，或者在恶劣的环境中运行。本文提出了一种简单的基于线性观测器的无位置传感器控制，它估计柱塞的瞬时速度，作为同步控制的相位参考。通过仿真和实验验证了该观测器的性能和灵敏度。对于特定的例子，估计位置(根据估计的速度积分)相对于测量位置滞后6.8°，并且它们的幅度相差小于1%。
Linear generators are key components for enabling power conversion from reciprocating prime movers such as Stirling and Thermoacoustic engines and wave energy convertors. The control of a linear generator is usually synchronized with instantaneous speed which sets a reference for optimal current - usually in phase with speed. Measuring speed, however, is often challenging because the linear alternator is located in a sealed pressurized vessel or operates in a harsh environment. This paper proposes a simple sensorless control based on a linear observer which estimates instantaneous velocity of the plunger to be used as a phase reference to synchronise the control. The performance and sensitivity of the proposed observer is studied and verified by means of both simulation and experiment. For the particular example the estimated position (from estimated speed integration) is lagging 6.8° towards the measured position, and their amplitudes are different by less then 1%.