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Energies 2017, 10(1), 114; doi:10.3390/en10010114

Designing and Testing Composite Energy Storage Systems for Regulating the Outputs of Linear Wave Energy Converters

1
Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
2
Zinergy Shenzhen Ltd., Taohuayuan Science and Technology Innovation Park, Baoan, Shenzhen 518101, China
3
Zinergy UK Ltd., Future Businesss Centre, Cambridge CB4 2HY, UK
4
The Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK
5
Department of Electronic and Electrical Engineering, Bath University, Bath BA2 7AY, UK
*
Authors to whom correspondence should be addressed.
Academic Editor: Stephen Nash
Received: 7 August 2016 / Revised: 29 December 2016 / Accepted: 6 January 2017 / Published: 18 January 2017
(This article belongs to the Special Issue Numerical Modelling of Wave and Tidal Energy)
View Full-Text   |   Download PDF [5598 KB, uploaded 18 January 2017]   |  

Abstract

Linear wave energy converters generate intrinsically intermittent power with variable frequency and amplitude. A composite energy storage system consisting of batteries and super capacitors has been developed and controlled by buck-boost converters. The purpose of the composite energy storage system is to handle the fluctuations and intermittent characteristics of the renewable source, and hence provide a steady output power. Linear wave energy converters working in conjunction with a system composed of various energy storage devices, is considered as a microsystem, which can function in a stand-alone or a grid connected mode. Simulation results have shown that by applying a boost H-bridge and a composite energy storage system more power could be extracted from linear wave energy converters. Simulation results have shown that the super capacitors charge and discharge often to handle the frequent power fluctuations, and the batteries charge and discharge slowly for handling the intermittent power of wave energy converters. Hardware systems have been constructed to control the linear wave energy converter and the composite energy storage system. The performance of the composite energy storage system has been verified in experiments by using electronics-based wave energy emulators. View Full-Text
Keywords: wave energy; linear machine; energy storage; power conversion; renewable energy wave energy; linear machine; energy storage; power conversion; renewable energy
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Nie, Z.; Xiao, X.; Hiralal, P.; Huang, X.; McMahon, R.; Zhang, M.; Yuan, W. Designing and Testing Composite Energy Storage Systems for Regulating the Outputs of Linear Wave Energy Converters. Energies 2017, 10, 114.

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