The Analysis of Tidal Stream Power

Hardisty, Jack

doi:10.1002/9780470743119

Cited by 64 publications

(38 citation statements)

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“…A tidal energy device is a renewable energy system designed to extract energy from the ebb and flow of tides in offshore areas with high tidal flow speed [16]. The development of tidal stream power is currently at an earlier stage than more common renewable energy sources such as wind power, and a wide range of designs exist, though many of the most successful devices are of the three-blade horizontal axis type.…”

Section: Evaluating Materials Efficiency Strategies: a Case Studymentioning

confidence: 99%

Evaluating the Environmental Dimension of Material Efficiency Strategies Relating to the Circular Economy

et al. 2018

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Abstract:Material efficiency is a key element of new thinking to address the challenges of reducing impacts on the environment and of resource scarcity, whilst at the same time meeting service and functionality demands on materials. Directly related to material efficiency is the concept of the Circular Economy, which is based on the principle of optimising the utility embodied in materials and products through the life-cycle. Although materials such as steel, on account of high recycling rates at end-of-life, are amongst the most 'circular' of manufactured materials, significant opportunities for greater material efficiency exist, which are yet to be widely implemented. Life Cycle Assessment (LCA) is commonly used to assess the environmental benefits of recovering and recycling materials through the manufacturing supply chain and at end-of-life. Using an example taken from renewable energy generation, this paper explores the correlation between product circularity and the environmental case for strategies designed to improve material efficiency. An LCA-based methodology for accounting for the recovery and reuse of materials from the supply chain and at end-of-life is used as the basis for calculating the carbon footprint benefits of five material efficiency scenarios. The results are compared with a number of proposed material circularity indicators. Two conclusions from this exercise are that (i) LCA methodologies based around end-of-life approaches are well placed for quantifying the environmental benefits of material efficiency and circular economy strategies and (ii) when applying indicators relating to the circularity of materials these should also be supported by LCA-based studies.

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Section: Evaluating Materials Efficiency Strategies: a Case Studymentioning

confidence: 99%

Evaluating the Environmental Dimension of Material Efficiency Strategies Relating to the Circular Economy

et al. 2018

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“…Since tides are created by astronomic events having periodic repetitions, tides can also be described as a summation of sine functions but with the important difference that in this case the frequency of the harmonic constituents are not always related to each other with integer factors. The level of the sea (or equivalently, the orthogonal velocity components of the tidal current) can be represented by [3][4][5]:…”

Section: Tides Analysis and Modellingmentioning

confidence: 99%

“…• Rectilinear (reversing) currents: usually in straits or inland bodies of water, like rivers or bays, where the water, constrained by channel configuration, flows approximately in a rectilinear pattern [4,10]. During the flow in each direction the speed changes from zero (slack water) to a maximum and then back to zero again.…”

Section: Tidal Currentsmentioning

confidence: 99%

Can Tidal Current Energy Provide Base Load?

Giorgi

Ringwood

2013

Energies

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Tidal energy belongs to the class of intermittent but predictable renewable energy sources. In this paper, we consider a compact set of geographically diverse locations, which have been assessed to have significant tidal stream energy, and attempt to find the degree to which the resource in each location should be exploited so that the aggregate power from all locations has a low variance. An important characteristic of the locations chosen is that there is a good spread in the peak tidal flow times, though the geographical spread is relatively small. We assume that the locations, all on the island of Ireland, can be connected together and also assume a modular set of tidal turbines. We employ multi-objective optimisation to simultaneously minimise variance, maximise mean power and maximise minimum power. A Pareto front of optimal solutions in the form of a set of coefficients determining the degree of tidal energy penetration in each location is generated using a genetic algorithm. While for the example chosen the total mean power generated is not great (circa 100 MW), the case study demonstrated a methodology that can be applied to other location sets that exhibit similar delays between peak tidal flow times.

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“…Este conjunto supone uno de los campos con mayor potencial de desarrollo (Villate y Brito 2015) (López et al 2014). En los últimos años se han concebido y desarrollado distintos dispositivos para posibilitar el aprovechamiento energético proveniente del océano (Hardisty 2009) (King y Tryfonas 2009), si bien todavía quedan por resolver una serie de retos ligados a la operación en el ámbito marino.…”

Section: Introductionunclassified

Modelado Dinámico y Control de un Dispositivo Sumergido Provisto de Actuadores Hidrostáticos

Portilla¹,

Piñeiro²,

Sánchez³

et al. 2017

Rev. iberoam. autom. inform. ind.

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ResumenLas corrientes marinas, fuente de energía renovable más predecible, localizan la mayor parte de su energía en altas profundidades. Para aprovechar esta energía se están desarrollando dispositivos flotantes, de tipo fondeado. La viabilidad económica de estos dispositivos requiere el abaratamiento de costos. El desarrollo de sistemas de control que permitan el cambio automático de orientación y profundidad del generador, con el fin de abaratar las maniobras de mantenimiento y aprovechar el recurso energético de forma óptima, resulta imprescindible. En este trabajo se presenta un actuador hidrostático y se realiza un modelo dinámico simple para control, de un dispositivo de dos grados de libertad, con un sistema de control de lastre. A partir de este modelo se ha desarrollado una ley de control multivariable, basada en una matriz de desacoplamiento no lineal y en la compensación de los términos de fricción y compresibilidad. Finalmente, la bondad del controlador ha sido validada mediante simulación. Palabras Clave:Energías Renovables, Sistemas Marinos, Control Multivariable, Sistemas variables con el tiempo, Integración OrcaFlex-Matlab. Dynamic Modelling and Control of a Submerged Device with Hydrostatic Actuators AbstractMarine currents represent the most predictable source of renewable energy. The greatest percentage of its energy is located in areas with high depths. In order to be able to operate at these depths, new devices are being developed, floating anchoring type. The economically viable harnessing of the tidal energy with these devices requires the development of control systems. These systems must allow the automatic change of orientation and depth of the generator to harness the energy in an optimal way. In this paper, a type of hydrostatic actuator based on the controlled handling of water ballast is selected. Next, a dynamic model, provided with two degrees of freedom, is presented for the control of a submerged device for the exploitation of tidal currents. From this model, a multivariate control law has been developed, based on a non-linear decoupling matrix and on the compensation of the terms of friction and compressibility. Finally, the controller's goodness has been validated by the development of several simulations.

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The Analysis of Tidal Stream Power

Cited by 64 publications

References 0 publications

Evaluating the Environmental Dimension of Material Efficiency Strategies Relating to the Circular Economy

Evaluating the Environmental Dimension of Material Efficiency Strategies Relating to the Circular Economy

Can Tidal Current Energy Provide Base Load?

Modelado Dinámico y Control de un Dispositivo Sumergido Provisto de Actuadores Hidrostáticos

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