Considerations on the control design for a three-tether wave energy converter
Wave energy converters (WECs) capable of extracting power in multiple degrees of freedom require a special attention from control engineers as the control problem becomes multivariable involving highly coupled dynamics of the plant. Taking the three-tether submerged buoy as an example of a multi-deg...
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| Published in: | Ocean engineering Vol. 183; pp. 469 - 477 |
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| Main Authors: | , , , , |
| Format: | Journal Article |
| Language: | English |
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01-07-2019
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| Abstract | Wave energy converters (WECs) capable of extracting power in multiple degrees of freedom require a special attention from control engineers as the control problem becomes multivariable involving highly coupled dynamics of the plant. Taking the three-tether submerged buoy as an example of a multi-degree-of-freedom WEC, this paper presents three main steps that should be taken during control system development. Firstly, an understanding of the system dynamics, its rigid body modes of vibration and input/output controllability is built using the singular value decomposition approach. Then, a causal close-to-optimal controller developed for the single-tether heaving WEC is extended to the multivariable control problem, demonstrating a significant increase in the power output as compared to the simple spring-damper approach. At the final stage, technical requirements imposed by this controller on the power take-off (PTO) machinery are investigated showing that, in order to achieve a 15%-improvement in power absorption compared to a quasi-standard spring-damper control, the amount of reactive power should be increased by 50%, forcing one PTO unit to operate as an actuator all the time. |
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| AbstractList | Wave energy converters (WECs) capable of extracting power in multiple degrees of freedom require a special attention from control engineers as the control problem becomes multivariable involving highly coupled dynamics of the plant. Taking the three-tether submerged buoy as an example of a multi-degree-of-freedom WEC, this paper presents three main steps that should be taken during control system development. Firstly, an understanding of the system dynamics, its rigid body modes of vibration and input/output controllability is built using the singular value decomposition approach. Then, a causal close-to-optimal controller developed for the single-tether heaving WEC is extended to the multivariable control problem, demonstrating a significant increase in the power output as compared to the simple spring-damper approach. At the final stage, technical requirements imposed by this controller on the power take-off (PTO) machinery are investigated showing that, in order to achieve a 15%-improvement in power absorption compared to a quasi-standard spring-damper control, the amount of reactive power should be increased by 50%, forcing one PTO unit to operate as an actuator all the time. |
| Author | da Silva, L.S.P. Cazzolato, B.S. Arjomandi, M. Sergiienko, N.Y. Ding, B. |
| Author_xml | – sequence: 1 givenname: N.Y. surname: Sergiienko fullname: Sergiienko, N.Y. email: nataliia.sergiienko@adelaide.edu.au organization: The University of Adelaide, School of Mechanical Engineering, Adelaide, Australia – sequence: 2 givenname: B.S. surname: Cazzolato fullname: Cazzolato, B.S. organization: The University of Adelaide, School of Mechanical Engineering, Adelaide, Australia – sequence: 3 givenname: M. surname: Arjomandi fullname: Arjomandi, M. organization: The University of Adelaide, School of Mechanical Engineering, Adelaide, Australia – sequence: 4 givenname: B. surname: Ding fullname: Ding, B. organization: The University of Adelaide, School of Mechanical Engineering, Adelaide, Australia – sequence: 5 givenname: L.S.P. surname: da Silva fullname: da Silva, L.S.P. organization: University of São Paulo, Department of Naval Architecture and Ocean Engineering, São Paulo, Brazil |
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| CitedBy_id | crossref_primary_10_1016_j_renene_2021_02_134 crossref_primary_10_1049_rpg2_12239 crossref_primary_10_1016_j_oceaneng_2022_111351 crossref_primary_10_1016_j_ins_2020_03_112 crossref_primary_10_1016_j_rser_2022_112668 crossref_primary_10_1016_j_apor_2021_102836 crossref_primary_10_1016_j_apor_2021_102924 crossref_primary_10_1016_j_energy_2022_126314 crossref_primary_10_1109_TIA_2022_3222144 crossref_primary_10_1016_j_apor_2020_102377 crossref_primary_10_1016_j_renene_2024_120579 crossref_primary_10_3390_su14042354 crossref_primary_10_3390_jmse9050490 |
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| Keywords | Three-tether WEC Wave energy converter Multivariable control Power take-off |
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| Title | Considerations on the control design for a three-tether wave energy converter |
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