Mooring Influence on the Productivity of a Pitching Wave Energy Converter

Paduano, Bruno; Pasta, Edoardo; Papini, Guglielmo; Carapellese, Fabio; Bracco, G.

doi:10.23919/oceans44145.2021.9706108

Cited by 8 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is worth noting that the significant dynamics of the mooring system can be incorporated by linearising mooring actions to synthesise controllers using numerical techniques [22]. Furthermore, although the optimal control action remains unaffected by wave directions in unconstrained conditions, the inclusion of a mooring system can also influence the synthesised controller, also when considering heaving devices [21]. In general, to pave the way for the commercialisation of wave energy systems, careful consideration of the mooring system and wave directionality should be performed in the initial optimisation stages of device development.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

On the Effect of Wave Direction on Control and Performance of a Moored Pitching Wave Energy Conversion System

Paduano,

Faedo,

Mattiazzo

2023

JMSE

Self Cite

View full text Add to dashboard Cite

In the pathways towards the commercialisation of wave energy systems, the need for reliable mathematical models is of paramount importance for the design and synthesis of model-based control techniques to maximise the performance of wave energy converters (WECs). Furthermore, these offshore marine systems are held in position by the use of mooring systems, which have recently been analysed beyond survivability conditions to investigate their influence on control synthesis and device performance. In this study, we delve into the complex challenge of incorporating relevant mooring dynamics in defining a representative control action while also examining the influence of wave directionality on the overall procedure. For the specific case of a spread mooring system, where the hull cannot weathervane and operates based on directionality, control synthesis must be performed taking into account this characteristic of the resource. In this context, because it is able to harvest energy from only the bow-directed waves, the PeWEC is considered as a representative case study. The control synthesis is realised using a tailored data-based model, and device performance is evaluated across different site conditions while accounting for wave direction. Among our overall conclusions, we show that neglecting the directionality of the wave resource for the PeWEC case study can lead to an overestimation of device performance of up to 50%, even though a prevalent wave direction exists at the site.

show abstract

Section: Discussionmentioning

confidence: 99%

“…If the station-keeping system significantly influences the dynamics of WECs, synthesising control actions without considering the mooring system can lead to non-representative and suboptimal results [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

On the Effect of Wave Direction on Control and Performance of a Moored Pitching Wave Energy Conversion System

Paduano,

Faedo,

Mattiazzo

2023

JMSE

Self Cite

View full text Add to dashboard Cite

show abstract

“…1 α (12) in which {P, C} : R → R + , q → {P(q), C(q)} represents the probability density function and the cumulative distribution function of the variable q, {σ, μ, α} ⊂ R are the three parameters of the GEV distribution, and p : R → R, q → p(q) is the map…”

Section: Wave To Tensionmentioning

confidence: 99%

“…Ideally, a mooring system needs to be able to guarantee the device survivability influencing as little as possible the associated device response and, hence, the power extraction. Clearly, in real applications, the influence of mooring systems on the device productivity has been studied numerically, finding that moorings can play a fundamental role in the device dynamics [12], [13], [14], [15], [16], [17], [18].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Investigation on the Performance of a Moored Pitching Wave Energy Conversion System

Paduano,

Carapellese,

Pasta

et al. 2024

IEEE J. Oceanic Eng.

View full text Add to dashboard Cite

This study delves into the question of whether the mooring system influences the dynamics of the device by conducting a comprehensive analysis of the inertial sea wave energy converter (ISWEC). Recognizing that wave energy converters exhibit complex behaviors that often push numerical models beyond their range of validity, this study highlights the importance of developing a representative model that accurately captures the intricate dynamics involved. To address this challenge, an experimental investigation of the ISWEC is conducted, aiming to establish a benchmark model that serves as a reference for validating and refining numerical models. Following the experimental investigation, this study proceeds with a numerical investigation to further explore the influence of the mooring system on the pitching device. The response of the device is analyzed both with and without the mooring system, allowing for a direct comparison of its effects on device dynamics and the associated harvested energy. By conducting numerical simulations under various operating conditions, this study provides an insight into the definition of representative mathematical modeling, analyzing and motivating the strong influence of the mooring system on the performances of a moored pitching wave energy conversion system.

show abstract

“…The influence of the mooring system (analysed by means of a linear data-based model) on the device dynamics is discussed in [10], [11], which investigate the response of a generic floating body and the associated energy harvested, by leveraging a frequency-domain approach. Nonlinearities are included in the performance assessment of a moored wave energy system in [12], [13], where a pitching device is considered. Finally, Gubesch et al [14] analyse the experimental response of an oscillating water column system in fixed conditions, moored by a taut and a catenary mooring system, reporting a significant reduction on device performance.…”

Section: Introductionmentioning

confidence: 99%

Data-Based Control Synthesis and Performance Assessment for Moored Wave Energy Conversion Systems: The PeWEC Case

Paduano

Carapellese

Pasta

et al. 2024

IEEE Trans. Sustain. Energy

Self Cite

View full text Add to dashboard Cite

With a model-based control strategy, the effectiveness of the associated control action depends on the availability of a representative control-oriented model. In the case of floating offshore wave energy converters (WECs), the device response depends upon the interaction between mooring system, any mechanical parts, and the hydrodynamics of the floating body. This study proposes an approach to synthesise WEC controllers under the effect of mooring forces building a representative data-based linear model able to include any relevant dynamics. Moreover, the procedure is tested on the moored pendulum wave energy converter (PeWEC) by means of a high-fidelity mooring solver, OrcaFlex (OF). In particular, the control action is computed with and without knowledge of the mooring influence, in order to analyse and elucidate the effect of the station-keeping system on the harvested energy. The performance assessment of the device is achieved by evaluating device power on the resource scatter characterising Pantelleria, Italy. The results show the relevance of the mooring dynamics on the device response and final set of control parameters and, hence, a significant influence of the station-keeping system on control synthesis and extracted mechanical power.

show abstract

Mooring Influence on the Productivity of a Pitching Wave Energy Converter

Cited by 8 publications

References 17 publications

On the Effect of Wave Direction on Control and Performance of a Moored Pitching Wave Energy Conversion System

On the Effect of Wave Direction on Control and Performance of a Moored Pitching Wave Energy Conversion System

Experimental and Numerical Investigation on the Performance of a Moored Pitching Wave Energy Conversion System

Data-Based Control Synthesis and Performance Assessment for Moored Wave Energy Conversion Systems: The PeWEC Case

Contact Info

Product

Resources

About