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Proceedings Paper

Enhancement of galloping-based wind energy harvesting by synchronized switching interface circuits
Author(s): Liya Zhao; Junrui Liang; Lihua Tang; Yaowen Yang; Haili Liu
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Paper Abstract

Galloping phenomenon has attracted extensive research attention for small-scale wind energy harvesting. In the reported literature, the dynamics and harvested power of a galloping-based energy harvesting system are usually evaluated with a resistive AC load; these characteristics might shift when a practical harvesting interface circuit is connected for extracting useful DC power. In the family of piezoelectric energy harvesting interface circuits, synchronized switching harvesting on inductor (SSHI) has demonstrated its advantage for enhancing the harvested power from existing base vibrations. This paper investigates the harvesting capability of a galloping-based wind energy harvester using SSHI interfaces, with a focus on comparing the performances of Series SSHI (S-SSHI) and Parallel SSHI (P-SSHI) with that of a standard DC interface, in terms of power at various wind speeds. The prototyped galloping-based piezoelectric energy harvester (GPEH) comprises a piezoelectric cantilever attached with a square-sectioned bluff body made of foam. Equivalent circuit model (ECM) of the GPEH is established and system-level circuit simulations with SSHI and standard interfaces are performed and validated with wind tunnel tests. The benefits of SSHI compared to standard circuit become more significant when the wind speed gets higher; while SSHI circuits lose the benefits at small wind speeds. In both experiment and simulation, the superiority of P-SSHI is confirmed while S-SSHI demands further investigation. The power output is increased by 43.75% with P-SSHI compared to the standard circuit at a wind speed of 6m/s.

Paper Details

Date Published: 2 April 2015
PDF: 10 pages
Proc. SPIE 9431, Active and Passive Smart Structures and Integrated Systems 2015, 94310E (2 April 2015); doi: 10.1117/12.2084000
Show Author Affiliations
Liya Zhao, Nanyang Technological Univ. (Singapore)
Junrui Liang, ShanghaiTech Univ. (China)
Lihua Tang, The Univ. of Auckland (New Zealand)
Yaowen Yang, Nanyang Technological Univ. (Singapore)
Haili Liu, ShanghaiTech Univ. (China)

Published in SPIE Proceedings Vol. 9431:
Active and Passive Smart Structures and Integrated Systems 2015
Wei-Hsin Liao, Editor(s)

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