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Numerical and experimental studies of excitation force approximation for wave energy conversion

Guo, Bingyong; Patton, Ron J.; Jin, Siya; Lan, Jianglin


Bingyong Guo

Siya Jin

Jianglin Lan


Guo Bingyong
Contact Person

Patton Ronald

Jin Siya

Lan Jianglin


Past or/and future information of the excitation force is useful for real-time power maximisation control of Wave Energy Converter (WEC) systems. Current WEC modelling approaches assume that the wave excitation force is accessible and known. However, it is not directly measurable for oscillating bodies. This study aims to provide accurate approximations of the excitation force for the purpose of enhancing the effectiveness of WEC control. In this work, three approaches are proposed to approximate the excitation force, by (i) identifying the excitation force from wave elevation, (ii) estimating the excitation force from the measurements of pressure, acceleration and displacement, (iii) observing the excitation force via an unknown input observer. These methods are compared with each other to discuss their advantages, drawbacks and application scenarios. To validate and compare the performance of the proposed methods, a 1/50 scale heaving point absorber WEC was tested in a wave tank under variable wave scenarios. The experimental data were in accordance with the excita-tion force approximations in both the frequency-and time-domains based upon both regular and irregular wave excitation. Although the experimental data were post-processed for model verification, these approaches can be applied for real-time power maximisation control with excitation force prediction.


Guo, B., Patton, R. J., Jin, S., & Lan, J. (2018). Numerical and experimental studies of excitation force approximation for wave energy conversion. Renewable energy, 125, 877-889.

Journal Article Type Article
Acceptance Date Mar 4, 2018
Online Publication Date Mar 14, 2018
Publication Date Sep 1, 2018
Deposit Date Dec 4, 2018
Publicly Available Date Mar 15, 2019
Print ISSN 0960-1481
Electronic ISSN 1879-0682
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 125
Pages 877-889
Keywords Excitation force modelling; Model verification; Wave energy conversion; System identification; Unknown input observer; Wave tank tests
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