Current-Modulation-Based On-Line Resonance Tuning Strategy for Linear Generator Drives
Current-Modulation-Based On-Line Resonance Tuning Strategy for Linear Generator Drives
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DOI：
10.1109/tie.2020.2978697
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发表时间：
2021-04
影响因子：
7.7
通讯作者：
Min Zhang;A. Bodrov;R. Shuttleworth;M. Iacchetti
中科院分区：
文献类型：
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作者：
Min Zhang;A. Bodrov;R. Shuttleworth;M. Iacchetti
线性发电机（LG）经常用于自由活塞斯特林发动机、热声发动机和波能转换器的能量收集。提出了一种真实的实时跟踪和保持LG谐振状态的控制策略。该算法基于LG对与瞬时位置（d轴）同相的电流分量的低频幅度调制的响应。调制后的气隙功率和调制信号的平均乘积被馈送到控制器中以调节d轴电流并恢复谐振。使用气隙电源代替直流电源提高了谐振跟踪精度，消除了稳态低频冲程振荡。本文提出了一个完整的理论分析，提供准确的稳态和小信号模型的控制综合。广泛的实验验证，包括在文章中证明，控制是能够恢复共振，即使当力源引入显着的附加机械阻抗。
Linear generators (LGs) are frequently used for energy harvesting with free-piston Stirling engines, thermoacoustic engines, and wave energy converters. This article 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 air-gap power and modulation signal is fed into a controller to adjust the d-axis current and restore resonance. The use of air-gap power instead of dc power improves resonance tracking accuracy and eliminates steady-state low-frequency stroke oscillations. This article presents a full theoretical analysis providing accurate steady-state and small-signal models for control synthesis. The broad experimental validation included in the article proves that the control is able to restore resonance even when the force-source introduces significant additional mechanical impedance.