Effect of piecewise damping torques and coefficients on power absorption of a point-absorber wave energy converter

Guanghua He, Chaogang Liu, Bangqi Chen, Hassan Ghassemi, Lei Liu, Kaibo Yang and Zhengxiao Luan

Renewable Energy, 2023, vol. 219, issue P1

Abstract: Wave energy converters (WECs), especially point-absorber WECs, are of great interest in recent years due to the global energy crisis. The power take-off (PTO) control strategy plays a crucial role in the motion response and power absorption of the WEC. This study investigates a WEC on a multi-float power generation platform as a case study, and compares four different control strategies. These control strategies are classified into two types based on the method of generating PTO damping: Type-A, which applies damping torque, and Type-B, which applies damping coefficient. Furthermore, each type has two subtypes: continuous and piecewise, depending on whether the damping torque or coefficient is continuous in the upward and downward motions of the WEC. The results indicate that the Type-B control strategy improves the power quality compared with the Type-A control strategy. Among the subtypes, the piecewise control strategy achieves greater power absorption than the continuous control strategy, while keeping the motion performance at an acceptable level.

Keywords: Point absorber; Power take-off control; Damping torque; Damping coefficient; Piecewise damping (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:219:y:2023:i:p1:s0960148123013551

DOI: 10.1016/j.renene.2023.119440

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