Resonance Tuning in Linear Alternator Drives via Direct-Current Amplitude Modulation
Resonance Tuning in Linear Alternator Drives via Direct-Current Amplitude Modulation
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DOI：
10.1109/icelmach.2018.8507023
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
M. Iacchetti;Min Zhang;R. Shuttleworth
中科院分区：
文献类型：
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作者：
M. Iacchetti;Min Zhang;R. Shuttleworth
往复式线性交流发电机（LA）用于许多利用压力波工作的能量收集技术中，例如海浪能量转换器、斯特林和热声发动机。LA通常包含实现共振系统的机械弹簧，该共振系统处理存储在移动质量中的交变动能流。然而，在实践中，参数不准确和工作频率的漂移导致非谐振操作，从而导致冲程和功率下降。本文提出了一种自适应调整策略的电子刚度，以恢复谐振和最大功率流。该算法是基于低频振幅扰动的电流分量的相位与中风。LA对该低频参数激励的响应允许检测非谐振条件并校正与冲程同相的电流幅度，以便恢复谐振。本文讨论了一个近似的数学分析的控制算法，并通过仿真验证。
Reciprocating Linear Alternators (LAs) are used in many energy harvesting technologies working with pressure waves, such as sea wave energy convertors, Stirling and Thermoacoustic engines. LAs usually incorporate mechanical springs realizing a resonant system which handles the alternating kinetic energy flow stored in the moving mass. In practice, however, parameter inaccuracies and drifts in the operating frequency result in off-resonance operation causing stroke and power drops. This paper presents an adaptive tuning strategy for the electronic stiffness in order to restore resonance and maximum power flow. The algorithm is based on a low-frequency amplitude perturbation of the current component in phase with the stroke. The response of the LA to this low-frequency parametric excitation allows the detection of out-of-resonance conditions and the correction of the current amplitude in phase with stroke in order to restore resonance. The paper discusses an approximated mathematical analysis of the control algorithm and presents validation via simulations.