TY - JOUR
T1 - Linear Non-Causal Optimal Control of an Attenuator Type Wave Energy Converter M4
AU - Liao, Zhijing
AU - Gai, Nian
AU - Stansby, Peter
AU - Li, Guang
N1 - Funding Information:
Manuscript received January 11, 2019; revised April 6, 2019; accepted June 5, 2019. Date of publication June 13, 2019; date of current version June 19, 2020. Z. Liao and N. Gai are grateful to the financial support from the joint “Queen Mary University of London - China Scholarship Council” scholarship. This work was also supported in part by a research contract from Wave Energy Scotland’s Control Systems programme and in part by the Newton Advanced Fellowship (No. NA160436) from Royal Society. Paper no. TSTE-00043-2019. (Corresponding author: Guang Li.) Z. Liao, N. Gai, and G. Li are with the School of Engineering and Material Science, Queen Mary University of London, London E1 4NS, U.K. (e-mail: [email protected]; [email protected]; [email protected]).
Publisher Copyright:
© 2010-2012 IEEE.
PY - 2019
Y1 - 2019
N2 - Ocean waves provide a promising and abundant renewable energy resource. One reason wave energy technology is still not mature enough for commercialization is the high unit cost of generated electricity. This needs to be improved by a combination of device and associated controller design. A multi-float and multi-mode-motion wave energy converter (M-WEC) enables much higher energy conversion compared with a single-float, single-mode WEC (S-WEC); however, the added complexity in dynamics of a M-WEC makes the corresponding controller design more challenging. While the majority of current WEC control research has been based on the control of S-WECs it has shown that control can significantly improve energy conversion. This paper aims to design a linear non-causal optimal controller for a M-WEC to demonstrate that this improvement also applies to more complex WEC systems. We choose a multi-body attenuator type M-WEC called M4 as a case study for which the desirable feature of predominantly linear dynamics has been demonstrated. This means that a linear controller can be designed based on a linear hydrodynamic model without introducing an intractable computational burden for real-time controller implementation. Numerical results show that the linear non-causal optimal controller can significantly improve the power capture of M4 over a broad range of peak spectral wave periods by 40% to 100%.
AB - Ocean waves provide a promising and abundant renewable energy resource. One reason wave energy technology is still not mature enough for commercialization is the high unit cost of generated electricity. This needs to be improved by a combination of device and associated controller design. A multi-float and multi-mode-motion wave energy converter (M-WEC) enables much higher energy conversion compared with a single-float, single-mode WEC (S-WEC); however, the added complexity in dynamics of a M-WEC makes the corresponding controller design more challenging. While the majority of current WEC control research has been based on the control of S-WECs it has shown that control can significantly improve energy conversion. This paper aims to design a linear non-causal optimal controller for a M-WEC to demonstrate that this improvement also applies to more complex WEC systems. We choose a multi-body attenuator type M-WEC called M4 as a case study for which the desirable feature of predominantly linear dynamics has been demonstrated. This means that a linear controller can be designed based on a linear hydrodynamic model without introducing an intractable computational burden for real-time controller implementation. Numerical results show that the linear non-causal optimal controller can significantly improve the power capture of M4 over a broad range of peak spectral wave periods by 40% to 100%.
KW - Wave energy
KW - Optimal control
KW - Non-causal control
KW - Wave prediction
UR - http://www.scopus.com/inward/record.url?scp=85078530594&partnerID=8YFLogxK
U2 - 10.1109/TSTE.2019.2922782
DO - 10.1109/TSTE.2019.2922782
M3 - Article
AN - SCOPUS:85078530594
SN - 1949-3029
VL - 11
SP - 1278
EP - 1286
JO - IEEE Transactions on Sustainable Energy
JF - IEEE Transactions on Sustainable Energy
IS - 3
M1 - 8736294
ER -