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  • 1.
    Wu, Jinming
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China.
    Yao, Yingxue
    Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China.
    Zhou, Liang
    School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China.
    Chen, Ni
    School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China.
    Yu, Huifeng
    State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China.
    Li, Wei
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Göteman, Malin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Performance analysis of solo Duck wave energy converter arrays under motion constraints2017In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 139, p. 155-169Article in journal (Refereed)
    Abstract [en]

    This paper studies the power capture performance of solo Duck wave energy converter (WEC) arrays. The barrier function method combined with a quasi-Newton BFGS optimization algorithm is applied to find the maximum captured power of the array when the Ducks are under motion constraints. Based on this optimized maximum captured power, the effects of separation distance, wave period, incident wave direction and Duck width on the array performance are investigated. For the two Ducks array, results show that the alternative constructive and destructive interaction stripes in the contour plot of the q-factor variation with non-dimensional separation distance are resulted from the diffracted wave pattern from each Duck, and the hydrodynamic interaction strength is reduced when constraints affect the performance. For the three Ducks array, the middle Duck shows larger variability of captured power than the side Ducks due to experiencing double in phase diffracted wave from the side ones. The captured power of the solo Duck WEC array is sensitive to incident wave direction, and arrays with Ducks of smaller width are found to have better performance in power capture efficiency.

  • 2.
    Wu, Jinming
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. Harbin Inst Technol, Sch Mechatron Engn, Harbin.
    Yao, Yingxue
    Harbin Inst Technol, Shenzhen Grad Sch, Shenzhen.
    Zhou, Liang
    Harbin Inst Technol, Sch Mechatron Engn, Harbin.
    Göteman, Malin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Latching and Declutching Control of the Solo Duck Wave-Energy Converter with Different Load Types2017In: Energies, ISSN 1996-1073, E-ISSN 1996-1073, Vol. 10, no 12, article id 2070Article in journal (Refereed)
    Abstract [en]

    The solo duck wave-energy converter (WEC) captures power in a point absorber manner, hence it exhibits high power-capture efficiency within only a narrow bandwidth. Passive control is characterized by a unidirectional power flow, and thus its engineering implementation can be simplified. In this paper, two typical passive control strategies, latching and declutching control, are applied to the solo duck WEC to improve its power-capture performance at wave periods larger and smaller than the natural period of the WEC, respectively. Special attention is paid to the peak value of instantaneous WEC performance parameters, including the peak motion excursion, the peak power take-off (PTO) moment, and the peak-to-average power ratio, when the captured power is maximized. Performance differences between the linear and coulomb loads are also investigated. Results show that both latching and declutching control can effectively improve captured power, but also incidentally increase the peak motion excursion and peak-to-average power ratio. When under latching and declutching control, the coulomb load leads to the same maximum relative capture width and peak motion excursion as the linear load, but presents smaller peak PTO moment and peak-to-average power ratio than the linear load, hence making the coulomb load the better choice for the solo duck WEC.

  • 3.
    Wu, Jinming
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity. School of Mechatronics Engineering, Harbin Institute of Technology, Heilongjiang, China.
    Zhao, Yingxue
    Shenzhen Graduate School, Harbin Institute of Technology, Shenzhen 518055, Guangdong, China.
    Zhou, Liang
    School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, Heilongjiang, China.
    Göteman, Malin
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Electricity.
    Real-time latching control strategies for the solo Duck wave energy converter in irregular waves2018In: Applied Energy, ISSN 0306-2619, E-ISSN 1872-9118, Vol. 222, p. 717-728Article in journal (Refereed)
    Abstract [en]

    As a point absorber, the solo Duck wave energy converter (WEC) shows high power capture efficiency within a narrow bandwidth around the natural period. In this paper, real-time latching control is applied to the solo Duck WEC in irregular waves to improve its performance in sea states away from the natural period. Two predictive latching control strategies, in which one is close-to-optimal and the other is sub-optimal, and one non-predictive strategy are considered. The improvement of the WEC performance due to latching control is studied. Compared to the performance under simple resistive control, the three latching control strategies show almost equivalent control effect, leading to an average increase of the maximum relative capture width by around 70% and an average decrease of the optimal power take-off (PTO) damping coefficient by around 60%. Since the non-predictive strategy requires no prediction of future excitation force and WEC motion, it can be identified as the best choice for the solo Duck WEC under latching control. Although latching control leads to significant increase of fatigue load on the WEC hull like other advanced controls, it does not cause additional fatigue damage to the PTO.

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