A continuous control approach to point absorber wave energy conversion

Guo, Bingyong; Patton, Ron J.; Abdelrahman, Mustafa; Lan, Jianglin

doi:10.1109/control.2016.7737655

Cited by 12 publications

(11 citation statements)

References 7 publications

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“…Inspired by the above background, a study regarding a designed 1/50 scale vertical oscillating PAWEC device (Fig. 1) has been ongoing at University of Hull [27,28]. The aim of this paper is to explore and gain further knowledge of the viscosity eect on the designed PAWEC dynamic behavior, and thereby to design an applicable non-linear state-space model (NSSM) considering viscosity.…”

Section: Introductionmentioning

confidence: 99%

Viscosity effect on a point absorber wave energy converter hydrodynamics validated by simulation and experiment

2018

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To achieve optimal power in a wave energy conversion (WEC) system it is necessary to understand the device hydrodynamics. To maximize conversion eciency the goal is to tune the WEC performance into resonance. The main challenge then to be overcome is the degree to which non-linearity in WEC hydrodynamics should be represented. Although many studies use linear models to describe WEC hydrodynamics, this paper aims to show that the non-linear viscosity should be carefully involved. To achieve this an investigation into the hydrodynamics of a designed 1/50 scale point absorber wave energy converter (PAWEC) in heave motion only is implemented to indicate the non-linear viscosity eect. A non-linear state-space model (NSSM) considering a quadratic viscous term is used to simulate PAWEC behaviors. The non-linear model is compared with the linear counterpart, and validated by computational uid dynamics (CFD) and experimental data. A conclusion is drawn that the non-linear PAWEC hydrodynamics (including amplitude and phase responses, conversion eciency) close to resonance or at high wave heights can only be described realistically when the non-linear viscosity is correctly taken into account. Inaccuracies in its representation lead to signicant errors in the tuning procedure which over-predict the dynamic responses and weaken the control system performance.

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Section: Introductionmentioning

confidence: 99%

Viscosity effect on a point absorber wave energy converter hydrodynamics validated by simulation and experiment

2018

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“…A PAWEC system consisting of a cylindrical heaving buoy of 1/50 th scale and a linear generator Power Take-Off (PTO) mechanism has been constructed at the University of Hull to study wave energy conversion. See [12], [11], [14], [15] for more details about design, modeling and test of that PAWEC. The system is assumed to move only in heave.…”

Section: System Descriptionmentioning

confidence: 99%

“…Since a vertical cylindrical buoy is considered, f b (t) is proportional to the displacement p(t) [15]…”

Section: System Descriptionmentioning

confidence: 99%

Observer-Based Unknown Input Estimator of Wave Excitation Force for a Wave Energy Converter

Abdelrahman

Patton

2020

IEEE Trans. Contr. Syst. Technol.

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“…Therefore, in this research, a adaptive electric spring is implemented to regulate the stiffness constant to run in resonance manner for different frequencies of the incident wave. The stiffness force or reaction force [10] can be created electrically due to certain current and voltage adjusted by power electronics converters. In this article, reaction force is applied during the operation of the generator to produce maximum power.…”

Section: Modelling Of Hydrodynamics Of Direct Wecmentioning

confidence: 99%

“…Preliminary, the MPT concept is explained in this paper according to the hydrodynamic performance of the WEC. The application of MPT mode requires the implementation specific control technique and power electronics converter [10].…”

Section: Introductionmentioning

confidence: 99%

Optimized Design of PM Halbach Array Linear Generator for Sea Wave Energy Converters Operate at Maximum Power Transfer

ELGebaly¹,

El-Nemr²

2019

Adv. sci. technol. eng. syst. j.

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This paper proposes Halbach array PM linear generators for direct conversion of ocean or sea wave energy. This generator is proposed to be directly coupled to a reciprocating wave energy system which may be a valued alternative for pneumatic and hydraulic systems. In this research, air-cored permanent magnet PM linear generator has been optimally designed according to optimal cost and performance indices. The design depends on Halbach array PM arrangement. The design this linear generator is appropriate for direct extraction of energy from sea waves specially at small wave amplitude. The finite element method and the space harmonic analysis are used to develop the electromagnetic design of this topology. In this article, the concept of the extraction of maximum permissible power from sea waves is established according to the direct wave energy converters hydrodynamics model. The dynamic analysis of the Halbach array linear generator is investigated during the state of maximum power extraction.

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A continuous control approach to point absorber wave energy conversion

Cited by 12 publications

References 7 publications

Viscosity effect on a point absorber wave energy converter hydrodynamics validated by simulation and experiment

Viscosity effect on a point absorber wave energy converter hydrodynamics validated by simulation and experiment

Observer-Based Unknown Input Estimator of Wave Excitation Force for a Wave Energy Converter

Optimized Design of PM Halbach Array Linear Generator for Sea Wave Energy Converters Operate at Maximum Power Transfer

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