Bodrov, Alexey

Iacchetti, Matteo

Shuttleworth, Roger

Zhang, Min

Linear Generators (LGs) are frequently used for energy harvesting with free-piston Stirling engines, thermoacoustic engines and wave energy converters. This paper presents a control strategy to track and maintain LG resonance conditions in real time. The algorithm is based on the LG response to a low-frequency amplitude modulation of the current component in phase with the instantaneous position (d-axis). The averaged product of modulated airgap power and modulation signal is fed into a controller to adjust the d-axis current and restore resonance. The use of airgap power instead of dc power improves resonance tracking accuracy and eliminates steady-state low-frequency stroke oscillations. The paper presents a full theoretical analysis providing accurate steady-state and small-signal models for control synthesis. The broad experimental validation included in the paper proves that the control is able to restore resonance even when the force-source introduces significant additional mechanical impedance<br/

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Current-Modulation-based on-line Resonance Tuning Strategy for Linear Generator Drives

https://www.research.manchester.ac.uk/portal/en/publications/currentmodulationbased-online-resonance-tuning-strategy-for-linear-generator-drives(559e3c41-4294-4005-91b7-a2f7339bbf30).html

Current-Modulation-based on-line Resonance Tuning Strategy for Linear Generator Drives

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