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Investigation on a spring-integrated mechanical power take-off system for wave energy conversion purpose

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  • Wu, Jinming
  • Qin, Liuzhen
  • Chen, Ni
  • Qian, Chen
  • Zheng, Siming

Abstract

In this work, a mechanical power take-off system (PTO) is proposed to be installed in a small-scale wave energy converter (WEC) to transfer wave power to electricity. Two pairs of one-way bearings are respectively embedded into two transmission chains to transfer bidirectional oscillation of the primary mover to unidirectional rotation of the generator. In addition to a flywheel mounted on the output shaft, a spring is integrated into each transmission chain to further smooth the generator speed. The working principle of the PTO is discussed in detail, including the situation of the PTO at different status combinations of the one-way bearings and the rules to determine the status combination in each time instance. Compared to the case when the flywheel is the unique smoothing device, a combination of the spring and flywheel significantly reduces the fluctuation of the generator speed. Two peaks are observed for the captured power versus the PTO configuration, and the one with a small spring stiffness and suitable generator damping is superior since a high power capture efficiency is achieved with a small fluctuation of the output power. Besides, the feasibility of the proposed PTO in smoothing generator speed in irregular waves is also verified.

Suggested Citation

  • Wu, Jinming & Qin, Liuzhen & Chen, Ni & Qian, Chen & Zheng, Siming, 2022. "Investigation on a spring-integrated mechanical power take-off system for wave energy conversion purpose," Energy, Elsevier, vol. 245(C).
    • Handle: RePEc:eee:energy:v:245:y:2022:i:c:s0360544222002213
    DOI: 10.1016/j.energy.2022.123318
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    6. Fatemehsadat Mirshafiee & Emad Shahbazi & Mohadeseh Safi & Rituraj Rituraj, 2023. "Predicting Power and Hydrogen Generation of a Renewable Energy Converter Utilizing Data-Driven Methods: A Sustainable Smart Grid Case Study," Energies, MDPI, vol. 16(1), pages 1-20, January.
    7. Zhiyuan Che & Haitao Yu & Saleh Mobayen & Murad Ali & Chunyu Yang & Andrzej Bartoszewicz, 2022. "An Improved Extended State Observer-Based Composite Nonlinear Control for Permanent Magnet Synchronous Motor Speed Regulation Systems," Energies, MDPI, vol. 15(15), pages 1-14, August.
    8. Yang, Lisheng & Huang, Jianuo & Mi, Jia & Hajj, Muhammad & Bacelli, Giorgio & Zuo, Lei, 2024. "Control-inspired design and power optimization of an active mechanical motion rectifier based power takeoff for wave energy converters," Renewable Energy, Elsevier, vol. 228(C).
    9. Sui, Guangdong & Shan, Xiaobiao & Chen, Yifeng & Zhou, Chunyu & Hou, Chengwei & Li, Hengyu & Cheng, Tinghai, 2024. "Dual-function of energy harvesting and vibration isolation via quasi-zero stiffness piezoelectric mechanism," Energy, Elsevier, vol. 301(C).
    10. Chen, Weixing & Lin, Xiongsen & Lu, Yunfei & Li, Shaoxun & Wang, Lucai & Zhang, Yongkuang & Gao, Feng, 2023. "Design and experiment of a double-wing wave energy converter," Renewable Energy, Elsevier, vol. 202(C), pages 1497-1506.

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