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Maximum power point tracking control strategy based on frequency and amplitude control for the wave energy conversion system

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  • Dong, Feng
  • Pan, Shangzhi
  • Gong, Jinwu
  • Cai, Yuanqi

Abstract

This paper presents a pendulum-type wave energy conversion (WEC) system, which can change its natural frequency by a center of gravity adjustment mechanism. Based on this characteristic, a frequency and amplitude control (FAC) strategy is proposed to realize the maximum power point tracking (MPPT) of the WEC system. Firstly, the natural frequency of the WEC system is adjusted according to the peak frequency of the wave spectrum to make the device resonate with the waves, which is the frequency control (FC) method. The essence of the FC method is to change the position of the mass block inside the pendulum by controlling the angular displacement of the motor, so as to change the moment of inertia and recovery stiffness of the device. Secondly, the load of the mass block is very large, which brings a great challenge to the motor starting, so this paper proposes a soft-start control strategy to solve this problem. Thirdly, a weighted average method is proposed to calculate the intrinsic impedance of the WEC system under irregular waves, and then make the mechanical resistance of the power take-off (PTO) system equal to the intrinsic impedance of the WEC system by controlling the damping torque of the generator, which is the amplitude control (AC) method. By combining the FC method and AC method, the amplitude and phase conditions can be satisfied simultaneously to realize the MPPT of the WEC system. Finally, the feasibility and accuracy of the proposed control strategies are verified by simulation results.

Suggested Citation

  • Dong, Feng & Pan, Shangzhi & Gong, Jinwu & Cai, Yuanqi, 2023. "Maximum power point tracking control strategy based on frequency and amplitude control for the wave energy conversion system," Renewable Energy, Elsevier, vol. 215(C).
    • Handle: RePEc:eee:renene:v:215:y:2023:i:c:s0960148123008790
    DOI: 10.1016/j.renene.2023.118973
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    References listed on IDEAS

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    1. Bódai, Tamás & Srinil, Narakorn, 2015. "Performance analysis and optimization of a box-hull wave energy converter concept," Renewable Energy, Elsevier, vol. 81(C), pages 551-565.
    2. Wu, Shuping & Liu, Chuanyu & Chen, Xinping, 2015. "Offshore wave energy resource assessment in the East China Sea," Renewable Energy, Elsevier, vol. 76(C), pages 628-636.
    3. Asai, Takehiko & Sugiura, Keita, 2021. "Numerical evaluation of a two-body point absorber wave energy converter with a tuned inerter," Renewable Energy, Elsevier, vol. 171(C), pages 217-226.
    4. Yue, Xuhui & Geng, Dazhou & Chen, Qijuan & Zheng, Yang & Gao, Gongzheng & Xu, Lei, 2021. "2-D lookup table based MPPT: Another choice of improving the generating capacity of a wave power system," Renewable Energy, Elsevier, vol. 179(C), pages 625-640.
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    Cited by:

    1. Yao, Ganzhou & Luo, Zirong & Lu, Zhongyue & Wang, Mangkuan & Shang, Jianzhong & Guerrerob, Josep M., 2023. "Unlocking the potential of wave energy conversion: A comprehensive evaluation of advanced maximum power point tracking techniques and hybrid strategies for sustainable energy harvesting," Renewable and Sustainable Energy Reviews, Elsevier, vol. 185(C).
    2. Xuhui Yue & Jintao Zhang & Feifeng Meng & Jiaying Liu & Qijuan Chen & Dazhou Geng, 2023. "Multi-Timescale Lookup Table Based Maximum Power Point Tracking of an Inverse-Pendulum Wave Energy Converter: Power Assessments and Sensitivity Study," Energies, MDPI, vol. 16(17), pages 1-25, August.
    3. Xuhui Yue & Feifeng Meng & Zhoubo Tong & Qijuan Chen & Dazhou Geng & Jiaying Liu, 2023. "Implementation Process Simulation and Performance Analysis for the Multi-Timescale Lookup-Table-Based Maximum Power Point Tracking under Variable Irregular Waves," Energies, MDPI, vol. 16(22), pages 1-26, November.

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