Impact of tidal generation on power system operation in Ireland

Bryans, A.G.; Fox, B.; Crossley, P.A.; O’Malley, Mark

doi:10.1109/pes.2006.1708989

Cited by 6 publications

(9 citation statements)

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“…This will require development of both appropriate system risk assessment techniques, and also the necessary resource models for use as inputs. These calculations will present differing challenges; wave, like wind, is a stochastic resource, whereas tidal is intermittent but predictable [31].…”

Section: Discussionmentioning

confidence: 99%

Capacity Value of Wind Power

Keane

Milligan

Dent

et al. 2011

IEEE Trans. Power Syst.

335

261

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Publisher's copyright statement: c 2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. The capacity value of a generator is the contribution that a given generator makes to generation system adequacy. The variable and stochastic nature of wind sets it apart from conventional energy sources. As a result, the modeling of wind generation in the same manner as conventional generation for capacity value calculations is inappropriate. In this paper a preferred method for calculation of the capacity value of wind is described and a discussion of the pertinent issues surrounding it is given. Approximate methods for the calculation are also described with their limitations highlighted. The outcome of recent wind capacity value analyses in Europe and North America, along with some new analysis are highlighted with a discussion of relevant issues also given.Index Terms--Wind power, capacity value, effective load carrying capability, power system operation and planning

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Section: Discussionmentioning

confidence: 99%

Capacity Value of Wind Power

Keane

Milligan

Dent

et al. 2011

IEEE Trans. Power Syst.

335

261

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“…Tidal currents become magnified in areas where large bodies of water are connected to the main sea by relatively small inlets. The water speed depends on the local topography, but if the spring and neap maximum velocities are measured, the full cycle can be approximated by a combination of a semi-diurnal sinusoid and a fortnightly sinusoidal function [32] [33]. The tidal current velocity at any time t is (1) where is the average of the peak tidal velocities, is half the range of peak tidal velocities, is the angular frequency of the tides, and is the angular frequency of the spring-neap (14.7 day) cycle.…”

Section: Tidal Modelmentioning

confidence: 99%

A preliminary design methodology for fatigue life prediction of polymer composites for tidal turbine blades

Kennedy

Leen

Brádaigh

2012

Proceedings of the Institution of Mechanical Engineers, Part L:

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Tidal turbine blades experience significant fatigue cycles during operation and it is expected that fatigue strength will be a major consideration in their design. Glass fibre reinforced polymers (GFRP) are a candidate low-cost material for this application. This paper presents a methodology for preliminary fatigue design of GFRP tidal turbine blades. The methodology combines (i) a hydrodynamic model for calculation of local distributions of fluid-blade forces, (ii) a finite element structural model for prediction of blade strain distributions, (iii) a fatigue damage accumulation model, which incorporates mean stress effects, and (iv) uniaxial fatigue testing of two candidate GFRP materials (for illustrative purposes). The methodology is applied here to the preliminary design of a three-bladed tidal turbine concept, including tower shadow effects, and comparative assessment of pitchregulated and stall-regulated control with respect to fatigue performance. INTRODUCTIONThe emerging field of ocean energy is naturally turning to composite materials because of their perceived non-corrosive properties in the harsh saltwater environment as well as their high specific strength and stiffness. Tidal turbines are to the forefront due to their reliable and predictable power delivery to the grid and the absence of overload conditions. A number of different designs of tidal turbines are already at utility scale trials. A low-solidity, two-bladed turbine, similar to wind turbines, and a high solidity, multi-blade, ducted rotor are presently undergoing customer testing [1]. Wave energy converters are also under consideration with a number of devices at full size prototype stage [2]. Glass-fibre reinforced polymers (GFRP) are candidate low-cost materials for the blades of tidal turbines and the energy collection surfaces of wave devices. It is therefore important to understand the durability and performance of such materials for these applications. A 10 rpm tidal turbine would see approximately 4 million revolutions per year and wave devices will encounter approximately the same number of waves. Therefore fatigue failure will need to be considered in the design of these devices.The structural properties of GFRP materials depend on orientation of the fibres, polymer type and fibre/polymer volume fraction. One of the main advantages of fibre reinforced materials is the ability to align the strong, stiff fibres with the main loads and thereby use the material to its maximum advantage. There are situations, however, particularly in relation to emerging technologies e.g. ocean energy, where (i) the loads are not very well understood, or (ii) the loads are complex and multi-directional in nature, for which a class of fibre-reinforced laminates called quasi-isotropic (QI) can be used. The typical QI layup has equal numbers of fibres at 0, 45, 90, and 135 degrees although many other configurations are possible. Often QI laminates are used for an entire structure or they can be implemented locally on other laminate types by addin...

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“…This paper will confine itself to tidal barrage generation, which exploits the difference in height between high and low tides. A detailed description of tidal current generation, which exploits the velocity of tidal currents directly (typically using an 'underwater wind turbine'-like device), may be found in [14]; an investigation of tidal current generation's contribution to supporting demand may be found in [4].…”

Section: ) Multiple Tidal Cyclesmentioning

confidence: 99%

“…There has been one previous study on the capacity value of tidal current generation [4]; as this is an entirely non-dispatchable technology, the approach required was more akin to that for wind generation than to one appropriate for tidal barrage plant with its limited timeshifting ability. A capacity credit result for a large tidal barrage was presented in Appendix D.6 of [5]; however, no detailed description of the methodology or discussion of the result was provided.…”

Section: Introductionmentioning

confidence: 99%

Capacity Value of Large Tidal Barrages

Radtke¹,

Dent²,

Couch³

2011

IEEE Trans. Power Syst.

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advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Additional information:Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract-This paper presents the first detailed capacity value calculation for tidal barrage generation, based on modelling of operational modes for the proposed 8 GW Severn Barrage scheme in Great Britain. The key finding is that the Effective Load Carrying Capability is very low as a percentage of installed capacity (less than 10% for the example presented here). This is because of the high probability of having zero available output at time of peak demand, if peak demand occurs on the wrong part of the tidal cycle; this result may be explained transparently using a simple two-state model of the barrage. The prospects for building a probabilistic model of tidal barrage availability are also discussed.

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Impact of tidal generation on power system operation in Ireland

Cited by 6 publications

References 0 publications

Capacity Value of Wind Power

Capacity Value of Wind Power

A preliminary design methodology for fatigue life prediction of polymer composites for tidal turbine blades

Capacity Value of Large Tidal Barrages

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