Adaptive Damping PTO Control of Wave Energy Converter for Irregular Waves Supported by Wavelet Transformation

Runhua He, Guanghua He (), Penglin Jing, Zhengxiao Luan and Chaogang Liu
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Runhua He: School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China
Guanghua He: School of Ocean Engineering, Harbin Institute of Technology, Weihai 264209, China
Penglin Jing: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Zhengxiao Luan: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China
Chaogang Liu: School of Mechatronics Engineering, Harbin Institute of Technology, Harbin 150001, China

Energies, 2025, vol. 18, issue 13, 1-25

Abstract: The power take-off (PTO) control strategy plays a crucial role in the heave response and power absorption of wave energy converters (WECs). This paper presents an adaptive damping PTO system to increase the power absorption of an oscillating-float WEC considering irregular wave conditions. A mathematical model of the WEC is established based on linear wave theory and validated by the Co-simulation of AMESIM and STAR-CCM+. The heave response and the power absorption of the WEC are calculated by the mathematical model, and an optimal damping database for the PTO system is constructed. The wavelet transformation is applied to analyze the frequencies distribution versus time history of irregular waves. The proposed optimal damping control (ODC) is employed to optimize the power absorption of the adaptive damping PTO system under two types of irregular waves. The results show that ODC can improve power absorption by allowing the WEC to adapt to different sea states. Compared to constant damping control (CDC), optimal damping control (ODC) increases the power absorption of the float by 62.5% in combined waves and up to 30 W in irregular waves.

Keywords: wave energy converter; power take-off; optimal damping control; wavelet transformation; irregular wave (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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