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首页> 外文会议>Conference on Active and passive smart structures and integrated systems; 20090309-12; San Diego, CA(US) >Optimization of Power Generation from Energy Harvesters in Broadband Stochastic Response
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Optimization of Power Generation from Energy Harvesters in Broadband Stochastic Response

机译：宽带随机响应中能量采集器发电的优化

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This paper presents recent analytical results pertaining to the optimization of power flow from vibratory energy harvesting systems, using principles from optimal feedback control and network theory. Historically, much of the research concerning such technologies has presumed that the vibratory energy source, from which power is to be extracted, oscillates harmonically at a known frequency. In this case, the optimization of power extraction from such sources by a resonant energy harvester can readily be accomplished through the use of classical impedance matching techniques. However, in many applications, vibratory power sources exhibit dynamic behavior more appropriately characterized by a stochastic process. In some cases, the power spectrum of this process may exhibit a rather wide band. In such circumstances, impedance matching techniques cannot be used to optimize power flow from the harvester, because the dynamic impedance they prescribe is always anticausal. This paper presents several theoretical concepts, intended for broad application in the energy harvesting area, which can be used to optimize power extracted from broadband sources. It is shown that in the broadband case, an optimal causal impedance still exists which maximizes power generation, but in order to derive it, the dissipation in the electrical system, as well as the mechanical system, must be taken into account in the system model. Levels of power generation with this controller are compared to those of the anticausal optimal performance, as well as to control design techniques that match the anticausal impedance at the resonant frequency. It is demonstrated that such causal matching techniques can be significantly sub-optimal in broadband applications, especially when electronic conversion is relatively efficient.
机译：本文使用最佳反馈控制原理和网络理论，介绍了与振动能量收集系统的功率流优化有关的最新分析结果。历史上，有关此类技术的许多研究都假定要从中提取功率的振动能源以已知的频率谐波振荡。在这种情况下，通过使用经典的阻抗匹配技术，可以很容易地实现谐振能量采集器从此类电源提取功率的优化。但是，在许多应用中，振动电源表现出的动态行为更适合以随机过程为特征。在某些情况下，此过程的功率谱可能会显示出相当宽的频带。在这种情况下，阻抗匹配技术不能用于优化来自收割机的功率流，因为它们规定的动态阻抗始终是因果关系。本文介绍了一些理论概念，旨在在能量收集领域中广泛应用，这些理论概念可用于优化从宽带源提取的功率。结果表明，在宽带情况下，仍然存在一个最佳的因果阻抗，该因果阻抗可以最大程度地提高发电量，但是为了获得该功率，必须在系统模型中考虑电气系统以及机械系统中的耗散。将该控制器的发电水平与抗因果关系最佳性能进行比较，并控制与谐振频率处的抗因果阻抗匹配的设计技术。事实证明，这种因果匹配技术在宽带应用中可能是次优的，尤其是在电子转换相对有效的情况下。

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