Phase control strategy for a wave energy hyperbaric converter

Costa, Paulo Roberto; Garcia‐Rosa, Paula B.; Estefen, Segen F.

doi:10.1016/j.oceaneng.2010.07.007

Cited by 28 publications

(19 citation statements)

References 14 publications

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“…Later, that theory was applied extensively to wave energy devices and associated applications [19,[21][22][23]. For zero forward speed, by employing similar concepts, Equation (1) can be expressed in the form of Equation (11):…”

Section: Governing Equation In Time Domainmentioning

confidence: 99%

Study on the Performance of the “Pendulor” Wave Energy Converter in an Array Configuration

Gunawardane

Kankanamge

Watabe³

2016

Energies

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For over three decades the "Pendulor" wave energy device has had a significant influence in this field, triggering several research endeavours. It includes a top-hinged flap propelled by the standing waves produced in a caisson with a back wall on the leeward side. However, one of the main disadvantages which impedes its progress is the enormous expense involved in the construction of the custom made typical caisson structure, about a little more than one-quarter of the wave length. In this study, the influence of such design parameters on the performance of the device is investigated, via numerical modelling for a device arranged in an array configuration, for irregular waves. The potential wave theory is applied to derive the frequency-dependent hydrodynamic parameters by making a distinction in the fluid domain into a separate sea side and lee side. The Cummins equation was utilised for the development of the time domain equation of motion while the transfer function estimation methods were used to solve the convolution integrals. Finally, the device was tested numerically for irregular wave conditions for a 50 kW class unit. It was observed that in irregular wave operating conditions, the caisson chamber length could be reduced by 40% of the value estimated for the regular waves. Besides, the device demonstrated around 80% capture efficiency for irregular waves thus allowing provision for avoiding the employment of any active control.

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Section: Governing Equation In Time Domainmentioning

confidence: 99%

Study on the Performance of the “Pendulor” Wave Energy Converter in an Array Configuration

Gunawardane

Kankanamge

Watabe³

2016

Energies

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“…The energy absorbed by the WEC is maximum when platform's movement is tuned to the incident wave frequency [11]. The PLC acts on the following features to achieve the resonance [12],…”

Section: Wec's Control Strategymentioning

confidence: 99%

“…The wave size (height and period) are tracked by a measuring buoy or a pressure sensor. Based on these data, the PLC knows the current available energy, and the implemented control algorithm [12] calculates the optimum system pressure in order to maintain the resonance with the waves. The desired pressure is achieved acting on the needle valve located in the Pelton turbine jet.…”

Section: Wec's Control Strategymentioning

confidence: 99%

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Selection of the Electrical Generator for a Wave Energy Converter

Osa

Iturregi

2010

REPQJ

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This paper presents the study accomplished to select the electrical generator implemented on a new design of Wave Energy Converter (WEC), identifying the key features that must be taken into account when studying the feasibility of a power plant for a given location and rated power. After introduced the proposed WEC, a review of different solutions adopted by other WEC system is presented. After an introduction of synchronous and asynchronous generator families, their means of working with variable speed and their capability to work connected to grid or isolated is explained. Both of them can work with variable speed, therefore the influence of selected generator in the control strategy and the efficiency gain working with variable speed is studied. The cost of the generation system and the investment return of the facility play an active role when selecting the generator system. After discussed their characteristics advantages and influence in the efficiency, some references will be given to take into account in the design procedures to define a WEC system for a given location. Key words

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“…In the wave energy field, various control strategies have been developed, such as latching control [3], declutching control [4], phase-control [5] and compared [6]. Energy maximisation remains the main objective of a control algorithm, but despite the development of advanced control strategies, handling technological limitations during operation, is a necessary control ability.…”

Section: Introductionmentioning

confidence: 99%

Receding horizon pseudospectral optimal control for wave energy conversion

Genest

Ringwood

2016

2016 UKACC 11th International Conference on Control (CONTROL)

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Abstract-The present study introduces a real-time control algorithm for applications involving energy maximisation and subject to technological limitations. Development of Wave energy converters constitutes an actual topic of research, in their designs and fluid-interactions, and particularly on their controllability. Immersed WECs are subject to fluid-interaction forces, generating unusual solicitations specific to hydrodynamic equation, such as radiation force or excitation forces.Various control strategies were recently developed and more advance control algorithms are currently applied on WECS, such as Model Predictive Control [1], or Pseudospectral optimal control [2]. Such control strategies, capable of maximizing the energy production while insuring the respect of path constraints, are more realistic and applicable in real conditions involving technological limitation aspects. This paper presents a receding horizon type control, based on pseudospectral approach in the control problem resolution. Dealing with irregular waves on a fixed control horizon, the presented control need to work with nonperiodic functions, implying the change of the basis functions involved in the description of the state and control variables, namely the halfrange Chebyshev Fourier functions.Application of the receding horizon control is presented for a generic WEC, and compared with a standard MPC algorithm.

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Phase control strategy for a wave energy hyperbaric converter

Cited by 28 publications

References 14 publications

Study on the Performance of the “Pendulor” Wave Energy Converter in an Array Configuration

Study on the Performance of the “Pendulor” Wave Energy Converter in an Array Configuration

Selection of the Electrical Generator for a Wave Energy Converter

Receding horizon pseudospectral optimal control for wave energy conversion

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