Abstract
In this paper, a single-body point absorber system is analyzed to enhance its power absorption performance. The wave energy converter consists of a single floating body coupled to a direct-drive power takeoff system placed on the seabed. The geometry of a cylindrical buoy with large draft is modified, obtaining a particular geometry that is used to enhance the power absorption of the wave converter at a given site and at a finite depth. A numerical analysis tool (NEMOH) is used to obtain the buoy's frequency-dependent hydrostatic parameters; in addition, the buoy's dimensions are parameterized to tune the natural frequency of the oscillating system toward the frequency of dominant incident waves, thus enhancing wave power absorption for a specific wave frequency range. Furthermore, the damping influence of the power takeoff system on the performance of the wave energy converter is also considered.
Highlights
I N RECENT years, ocean wave energy has become increasingly relevant to the global renewable energy outlook
The power that the wave energy converters (WECs) device can absorb from waves can be described by the capture width ratio (CWR), obtained by dividing the average absorbed power by the incident wave power multiplied by the buoy capture width
For a finite water depth, a particular buoy geometry was dimensioned by analyzing its frequencydependent hydrostatic parameters and the WEC performance in frequency domain, making it possible to define which buoy dimensions enhance hydrostatic parameters, improving WEC performance at finite water depths for a given sea state
Summary
I N RECENT years, ocean wave energy has become increasingly relevant to the global renewable energy outlook. In [23] and [26], a supplementary mass is utilized to add inertia to the oscillating system, increasing absorption power This component is placed on a moving mechanism that couples the buoy’s movement to the PTO system, whereas in [27] and [28] an auxiliary mechanical system is utilized to provide an extra mechanical load, tuning the system’s natural frequency. Adding inertia to the oscillatory system helps to adjust its natural frequency to dominant incident waves at the operation site This can be done by adjusting buoy dimensions (draft and radius) to increase hydrostatic parameters; a particular buoy shape is used to enhance system performance at a specific water depth, maximizing its power absorption. A single-body point-absorber system is designed to operate along Mexican coastlines in the Pacific Ocean, where the sea states are characterized by short-period waves and the wave energy resource is low in comparison to other places around the world
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