Self-Adaptive Global-Best Harmony Search Algorithm-Based Airflow Control of a Wells-Turbine-Based Oscillating-Water Column

M’zoughi, Fares; Hernández, Izaskun Garrido; Hernández, A.; Sen, Manuel De la

doi:10.3390/app10134628

Cited by 27 publications

(21 citation statements)

References 43 publications

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“…A variable for the representation of the spatial dimension in the wave's front direction may be represented for transferring the oscillating behavior to any point on the wave's surface. Hence, Equation (1) may be rewritten as follows [27]:…”

Section: Equations Of Motions In the Fowtmentioning

confidence: 99%

Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization

et al. 2021

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In this article, a new strategy for switching control has been proposed with the aim of reducing oscillations in floating offshore wind turbines. Such oscillations lead to a shortage in the system’s efficiency, lifespan and harvesting capability of wind and wave energies. In order to study the decreasing of undesired oscillations in the system, particularly in pitch and top tower fore-aft movements, a square-shaped platform barge equipped with four symmetric oscillating water columns has been considered. The oscillating water columns’ air flux valves allow to operate the air columns so that to control the barge movements caused by oscillatory motion of the waves. In order to design the control scheme, response amplitude operators have been used to evaluate the performance of the system for a range of wave frequency profiles. These response amplitude operators analysis makes it possible to implement a switching control strategy to adequately regulate the valves opening/closing transition. The obtained results show that the proposed controlled oscillating water column-based barge present a better performance compared to the traditional barge one. In the case study with the period of 10 s, the results indicate the significant oscillation reduction for the controlled oscillating water column-based system compared to the standard barge system by 30.8% in pitch angle and 25% in fore-aft displacement.

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Section: Equations Of Motions In the Fowtmentioning

confidence: 99%

Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization

et al. 2021

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“…The air volume in the capture chamber of the oscillating water column is defined from the chamber's volume and the water volume as [20][21][22]:…”

Section: Capture Chamber Modelmentioning

confidence: 99%

“…where V c , w c and l c are respectively the capture chamber's volume, inner width and length. The volume flow rate can be defined from Equation ( 3) by [20][21][22]:…”

Section: Capture Chamber Modelmentioning

confidence: 99%

Rotational Speed Control Using ANN-Based MPPT for OWC Based on Surface Elevation Measurements

M’zoughi

Garrido

et al. 2020

Applied Sciences

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This paper presents an ANN-based rotational speed control to avoid the stalling behavior in Oscillating Water Columns composed of a Doubly Fed Induction Generator driven by a Wells turbine. This control strategy uses rotational speed reference provided by an ANN-based Maximum Power Point Tracking. The ANN-based MPPT predicts the optimal rotational speed reference from wave amplitude and period. The neural network has been trained and uses wave surface elevation measurements gathered by an acoustic Doppler current profiler. The implemented ANN-based rotational speed control has been tested with two different wave conditions and results prove the effectiveness of avoiding the stall effect which improved the power generation.

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“…In [37], a fuzzy gain scheduled and PI-type airflow controller for an OWC, which was an advanced version of the airflow controller, were presented earlier in [23,24]. Recently, some artificial intelligence-based airflow controller techniques have been proposed [38][39][40]. A self-adaptive global best harmony search algorithm-based airflow control of OWC was proposed by [38] wherein four variants of the harmony search algorithm were implemented and tested to optimize the control design of the PID controller in the airflow control scheme.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some artificial intelligence-based airflow controller techniques have been proposed [38][39][40]. A self-adaptive global best harmony search algorithm-based airflow control of OWC was proposed by [38] wherein four variants of the harmony search algorithm were implemented and tested to optimize the control design of the PID controller in the airflow control scheme. In [39], another approach for airflow control was proposed which utilized symmetry-breaking concept to design the controller.…”

Section: Introductionmentioning

confidence: 99%

Centralized Airflow Control to Reduce Output Power Variation in a Complex OWC Ocean Energy Network

et al. 2020

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A centralized airflow control scheme for a complex ocean energy network (OEN) is proposed in this paper to reduce the output power variation (OPV). The OEN is an integrated network of multiple oscillating water columns (OWCs) that are located at different geographical sites connected to a common electrical grid. The complexity of the OWC-OEN increases manifolds due to the integration of several OWCs and design of controllers become very challenging task. So, the centralized airflow control scheme is designed in two stages. In control stage-1, a proportional-integral- (PI-) type controller is designed to provide a common reference command to control stage-2. In control stage-2, the antiwindup PID controllers are implemented for the airflow control of all the OWCs simultaneously. In order to tune the large number of control parameters of this complex system, a fitness function based on integral squared error (ISE) is minimized using the widely adopted particle swarm optimization (PSO) technique. Next, the simulation results were obtained with random wave profiles created using the Joint North Sea Wave Project (JONSWAP) irregular wave model. The OPV of the proposed OWC-OEN was reduced significantly as compared to the individual OWC. It was further observed that the OPV of the proposed scheme was lower than that achieved with uncontrolled and MPPT controlled OWC-OEN. The effect of communication delay on the OPV of the proposed OWC-OEN scheme was also investigated with the proposed controller, which was found to be robust for a delay up to 100 ms.

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Self-Adaptive Global-Best Harmony Search Algorithm-Based Airflow Control of a Wells-Turbine-Based Oscillating-Water Column

Cited by 27 publications

References 43 publications

Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization

Switching Control Strategy for Oscillating Water Columns Based on Response Amplitude Operators for Floating Offshore Wind Turbines Stabilization

Rotational Speed Control Using ANN-Based MPPT for OWC Based on Surface Elevation Measurements

Centralized Airflow Control to Reduce Output Power Variation in a Complex OWC Ocean Energy Network

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