Oscillating-water-column wave energy converters: A critical review of numerical modelling and control

Rosati, Marco; Henriques, J.C.C.; Ringwood, John V.

doi:10.1016/j.ecmx.2022.100322

Cited by 22 publications

(13 citation statements)

References 104 publications

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“…C a (𝜙) is the pressure coefficient, a nonlinear function of the flux coefficient (𝜙), defined in (5). Equation ( 6) relates to the turbine torque (T t ), with C t (𝜙) the torque coefficient.…”

Section: Pto Air Turbinementioning

confidence: 99%

“…Around the world, research and development of wave energy converters (WECs) is accelerating, as the need for diverse renewable energy sources grows [1–3]. Many WEC devices, including the popular oscillating water column (OWC) WEC, are being tested at sea or deployed for commercial trial [4, 5]. A breakwater‐mounted OWC system is shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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Adaptive second order sliding mode control of an oscillating water column

Mosquera,

Evangelista,

Puleston

et al. 2023

IET Renewable Power Gen

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The energy from waves has a vast untapped potential to contribute to renewable energy supply and diversification. For that reason, wave energy conversion systems have been a topical research area in recent years. In particular, harnessing wave energy with an oscillating water column converter has proved to be one suitable solution, which has also seen a number of successful deployments. Nevertheless, additional research is required for this technology in order to reach full commercial maturity and economic performance. This paper proposes an adaptive second order sliding mode controller to maximise the converted energy. In particular, the proposed adaptive control setup maintains the sliding mode robust features, while reducing high frequency oscillations and abrupt control actions produced by fixed‐gain algorithms. A comparison of energy generation performance shows better energy conversion efficiency of the proposed control strategy over standard speed regulation control strategies, even considering air compression dynamics and hydrodynamics in the tests.

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Section: Pto Air Turbinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adaptive second order sliding mode control of an oscillating water column

Mosquera,

Evangelista,

Puleston

et al. 2023

IET Renewable Power Gen

View full text Add to dashboard Cite

show abstract

“…OWCs present several advantages over other WECs. Principally, the minimal number of moving parts (i.e., air turbine and electrical generator) are located above the free water surface in a typical OWC system [18]. Also, OWCs can operate efficiently even when subjected to a lowfrequency motion, typically around 0.1 Hz [19].…”

Section: Introductionmentioning

confidence: 99%

“…The present manuscript aims to investigate the existing developments in the oscillating water column technology in the open sea by presenting the evolution of the floating OWC concept and providing an overview of current knowledge. Although numerous studies have covered different techniques to capture the ocean waves focusing on OWCs [18,[23][24][25][26], dedicated research on floating OWCs in the open sea (where severe climate conditions prevail) has not been presented to the author's knowledge.…”

Section: Introductionmentioning

confidence: 99%

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Konispoliatis

2024

J Energ Power Technol

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The main challenge in designing offshore renewable energy structures is to ensure their structural integrity on a life cycle basis while operating in harsh environments and, in parallel, being financially competitive and environmentally friendly concerning other types of energy systems. The Oscillating Water Column (OWC) converters are among the first energy converters to be developed and deployed into the sea due to their relative simplicity of operation and relatively small number of moving parts. This review provides an overview of the recent floating OWC prototypes and projects and the latest research developments in wave energy conversion using the oscillating water column principle. Furthermore, critical structural advances are discussed, mainly focusing on the converter’s geometry and type and its mooring system design towards amplifying the absorbed wave power.

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“…The efficiency of the WEC depends mainly on this system; it can be considered as the brain [11] because it can influence the dynamics of the component that interacts with the wave to maximize energy capture. The PTO system is based on a hydraulic [16], pneumatic [17,18] or mechanical system [9,19]; hydraulic and pneumatic components decrease the efficiency of WECs [9]. For this reason, in recent years, the application of the direct drive mechanical system and the direct electrical drive system has increased [11].…”

Section: Introductionmentioning

confidence: 99%

Study of a New Wave Energy Converter with Perturb and Observe Maximum Power Point Tracking Method

2023

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Ocean waves contain the highest energy density among renewable energy sources. However, harnessing the energy from ocean waves represents a challenge because wave energy converters (WECs) must be designed to have great survivability and efficiency. The power production challenge of any WEC depends on the power take-off (PTO) system efficiency. Maximum power point tracking (MPPT) algorithms have been widely applied in renewable energy from photovoltaic and wind sources, and have subsequently been adapted to wave energy converters (WECs). Energy extraction is optimized by applying MPPT, resulting in an increase in efficiency. This study aims to address the analysis of the influence of the perturb and observe MPPT in the electrical power performance of a WEC composed of a point absorber, a hinged arm and a direct mechanical drive PTO system. The PTO is characterized by a pulley system, a counterweight, one-way bearings, a gearbox, a flywheel and an electric generator; in the present study it is considered to be a cylindrical point absorber. The linear theory and the viscous damping effect are applied to analyze the hydrodynamic behavior of the point absorber. Regarding the two generators considered in the present study, the contribution of MPPT is greater for the low power generator; the high values of the capture width ratio (CWR) occur at low values of period and wave height, showing the maximum value in the high-power generator.

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Oscillating-water-column wave energy converters: A critical review of numerical modelling and control

Cited by 22 publications

References 104 publications

Adaptive second order sliding mode control of an oscillating water column

Adaptive second order sliding mode control of an oscillating water column

Floating Oscillating Water Column Wave Energy Converters: A Review of Developments

Study of a New Wave Energy Converter with Perturb and Observe Maximum Power Point Tracking Method

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