Electrical power management and optimization with nonlinear energy harvesting structures
Electrical power management and optimization with nonlinear energy harvesting structures
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DOI：
10.1177/1045389x18808390
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发表时间：
2018-11
影响因子：
2.7
通讯作者：
Wen Cai;R. Harne
中科院分区：
文献类型：
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作者：
Wen Cai;R. Harne
近年来，在了解非线性振动能量收集系统的机会方面取得了很大的进展，既关注结构子系统，也关注电气子系统。然而，在实际应用中，将非线性能量收集结构与有效的非线性整流和电源管理电路集成的最佳方法的知识上出现了明显的脱节。为了填补这一知识空白，本研究采用阻抗原理研究了带有桥式整流器和降压变换器的非线性振动能量采集器的功率优化策略。收割机结构内部阻抗的频率和幅值依赖性对传统的阻抗匹配概念提出了挑战。建立了系统级优化策略，并通过仿真和实验进行了验证。通过仔细的研究，揭示了利用部分负荷信息进行电力功率优化的方法，并与全负荷分析进行了对比验证。这些结果表明，尽管结构和电路中存在非线性，但未来最优非线性能量收集系统的研究和实现可能会通过建立在线性理论基础上的潮流概念找到有效的指导。
In recent years, great advances in understanding the opportunities for nonlinear vibration energy harvesting systems have been achieved giving attention to either the structural or electrical subsystems. Yet, a notable disconnect appears in the knowledge on optimal means to integrate nonlinear energy harvesting structures with effective nonlinear rectifying and power management circuits for practical applications. Motivated to fill this knowledge gap, this research employs impedance principles to investigate power optimization strategies for a nonlinear vibration energy harvester interfaced with a bridge rectifier and a buck-boost converter. The frequency and amplitude dependence of the internal impedance of the harvester structure challenges the conventional impedance matching concepts. Instead, a system-level optimization strategy is established and validated through simulations and experiments. Through careful studies, the means to optimize the electrical power with partial information of the electrical load is revealed and verified in comparison to the full analysis. These results suggest that future study and implementation of optimal nonlinear energy harvesting systems may find effective guidance through power flow concepts built on linear theories despite the presence of nonlinearities in structures and circuits.