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Nonlinear Modeling and Verification of a Heaving Point Absorber for Wave Energy Conversion

Gilbert, James; Guo, Bingyong; Jin, Siya; Parsons, Dan; Patton, Ron

Abstract

Although the heaving Point Absorber (PA) concept is well known in wave energy conversion research, few studies focus on appropriate modelling of non-linear fluid viscous and mechanical friction dynamics. Even though these concepts are known to have non-linear effects on the hydrodynamic system, most research studies consider linearity as a starting point and in so doing have a weak approach to modelling the true dynamic behaviour, particularly close to resonance. The sole use of linear modelling leads to limited ability to develop control strategies capable of true power capture optimisation and suitable device operation. Based on a 1/50 scale cylindrical heaving PA, this research focuses on a strategy for hydrodynamic model development and experimental verification. In this study, nonlinear dynamics are considered, including the lumped effect of the fluid viscous and mechanical friction forces. The excellent correspondence between the derived non-linear model and wave tank tested PA behaviours provides a strong background for wave energy tuning and control system design.

Journal Article Type Article
Publication Date Aug 17, 2017
Journal IEEE transactions on sustainable energy
Print ISSN 1949-3029
Electronic ISSN 1949-3037
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 9
Issue 1
Pages 453-461
DOI https://doi.org/10.1109/tste.2017.2741341
Keywords Renewable Energy, Sustainability and the Environment
Publisher URL http://ieeexplore.ieee.org/document/8012409/
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