Category Archives: Sector Overview

HVDC Transmission for Offshore Wind Farms


Raymundo Enrique Torres Olguin, Alejandro Garces, Gilbert Bergna – Large Scale Renewable Power Generation, 2014

Abstract

Large-scale wind energy expansion is limited by factors such as the land use and the visual impact of facilities on land. Offshore wind energy can overcome the above-mentioned limitations. In addition, wind velocity is higher and more constant offshore than onshore. This chapter will present an overview of different topologies for grid integration of offshore wind farms. Special emphasis is made on the offshore grid topologies and types of power electronic converters.

Link

Leave a comment

Filed under Grid, Sector Overview

Guidance on the use of synthetic fibre ropes for marine energy devices Deliverable 3.5.2 from the MERiFIC Project


Sam Weller, Peter Davies, Lars Johanning, and Stephen Banfield – MERiFIC Work Package 3, October 2013

Abstract

This report is a deliverable of MERiFIC Work Package 3: ‘Dynamic Behaviour of Marine Energy Devices’ involving the collaboration of IFREMER (Institut français de recherche pour l’exploitation de la mer) in France and the University of Exeter in the United Kingdom. Although synthetic ropes have been used for the station-keeping of offshore structures for the past two decades predominantly by the oil, gas and shipping industries, there is considerable interest in their utilisation for the station-keeping of marine renewable energy (MRE) devices. Continue reading

Leave a comment

Filed under Component Development, Sector Overview

New approaches in harnessing wave energy: With special attention to small islands


M. Fadaeenejad, R. Shamsipour, S.D. Rokni, and C. Gomes – Renewable and Sustainable Energy Reviews, January 2014

Abstract

The application of renewable energies has increased rapidly in the previous decade to solve some problems such as growing energy demand and environmental issues. Wave power as a high potential renewable energy, is more predictable compared to other renewable sources. Although there are many research works about wave energy, however a few of them considered a suitable wave energy converter (WEC) as a power system for remote islands. Wave energy potential for remote islands is discussed in this review by regarding environmental impacts, various types of wave energy converters and applied wave power projects for various islands. The results show that wave energy plays a key role for sustainable development of offshore islands by considering the traditional looks and environmental protection.

Link

Leave a comment

Filed under Sector Overview

Status of micro-hydrokinetic river technology in rural applications: A review of literature


Herman Jacobus Vermaak, Kanzumba Kusakana, and Sandile Philip Koko – Renewable and Sustainable Energy Reviews, January 2014

Abstract

Apparently, most hydrokinetic literatures mainly concentrate on large-scale technologies such as waves, tides and ocean current applications. This could be one of the reasons delaying the utilization of small-scale hydrokinetic river technology in rural areas. This paper therefore critically reviews the current status of micro-hydrokinetic river (MHR) technology for rural applications. Relevant research literatures based on developments, applications, design, operation as well as different MHR technologies involved in rural electrification projects have been reviewed. After conducting these reviews it has become clear that one of the key barriers hindering the employment of MHR technology in rural areas with access to flowing water is the lack of research demonstrating the technical, economic and environmental benefits of this technology compared to other rural electrification techniques. Studies that look towards the long-term perspective of techno-economic analysis inclusive of capital, maintenance and running costs computations need to be carried out promoting the interest in utilizing this technology. This paper will aid researchers to identify areas that need to improve as well as encourage public bodies to implement proper energy policies regarding the MHR technology usage in rural areas. It will also create awareness among site owners, investors, project developers and decision makers regarding the potential benefits of using this technology in rural areas especially in countries with little or no elevation.

Link

Leave a comment

Filed under Economics, Sector Overview

Uncertainties in the design of support structures and foundations for offshore wind turbines


Vicente Negro, José-Santos López-Gutiérrez, M. Dolores Esteban, and Clara Matutano – Renewable Energy, March 2014

Abstract

Offshore wind industry has exponentially grown in the last years. Despite this growth, there are still many uncertainties in this field. This paper analyzes some current uncertainties in the offshore wind market, with the aim of going one step further in the development of this sector. To do this, some already identified uncertainties compromising offshore wind farm structural design have been identified and described in the paper. Examples of these identified uncertainties are the design of the transition piece and the difficulties for the soil properties characterization. Continue reading

Leave a comment

Filed under Component Development, Sector Overview, Standards and Protocols

Off-shore wind farm development: Present status and challenges


Rehana Perveen, Nand Kishor, and Soumya R. Mohanty – Renewable and Sustainable Energy Reviews, January 2014

Abstract

Offshore wind farm (OWF) is an emerging technology in the wind energy conversion system. These wind resources are abundant, stronger, and are more consistent in terms of their availability than land-based wind resources. As a matter of fact significantly higher energy production is achieved due to larger wind turbine ratings and stronger wind profiles. Continue reading

Leave a comment

Filed under Review, Sector Overview

Offshore Wind-turbine Structures: A Review


Muhammad Arshad and Brendan C. O’Kelly – Proceedings of the ICE – Energy, November 2013

Abstract

This paper reviews various issues related to wind-power generation, one of the more popular forms of renewable energy, including attractions and challenges of electric power generation through onshore and offshore resources. Significant increases in wind-turbine dimensions, rated power-generation capacity and size of wind farm developments over the past two decades are projected to continue. Offshore wind-power generation presents many engineering challenges including: limited guidelines available for analysis and design of foundation/support structures; inadequate logistics for construction/fabrication; and comparatively expensive operation and maintenance costs, which combined result in current levelised cost of energy approximately double that for onshore wind-power generation. Different offshore foundation options are discussed in terms of general layout, loading characteristics and related fundamental natural frequency. Outlooks for some new approaches/developments and areas for further research are identified that may go towards reducing the levelised cost of energy for wind-power generation more in line with that from other energy resources, thereby enhancing the attractiveness of this industry for potential investors.

Link

Leave a comment

Filed under Component Development, Sector Overview

Review of wave energy technologies and the necessary power-equipment


Iraide López, Jon Andreu, Salvador Ceballos, Iñigo Martínez de Alegría, and Iñigo Kortabarria – Renewable and Sustainable Energy Reviews, November 2013

Abstract

The wave energy is having more and more interest and support as a promising renewable resource to replace part of the energy supply, although it is still immature compared to other renewable technologies. This work presents a complete analysis of the wave energy technology, starting with the characterisation of this global resource in which the most suitable places to be exploited are showed, and the classification of the different types of wave energy converters in according to several features. It is also described in detail each of the stages that are part in the energy conversion, that is, from the capture of the energy from the waves to the extraction of a proper electrical signal to be injected to the grid. Likewise, existing offshore energy transmission alternatives and possible layouts are described.

Link

 

 

Leave a comment

Filed under Sector Overview

Ocean’s Renewable Power and Review of Technologies: Case Study Waves


E. Enferad and D. Nazarpour – New Developments in Renewable Energy

This is a chapter in a book describing characteristics of wave resources, global resource availability, and different concepts for converting wave motion into electricity.

Link

Leave a comment

Filed under Sector Overview

2002–2012: 10 Years of Research Progress in Horizontal-Axis Marine Current Turbines


Kai-Wern Ng, Wei-Haur Lam, and Khai-Ching Ng – Energies, March, 2013

Abstract

Research in marine current energy, including tidal and ocean currents, has undergone significant growth in the past decade. The horizontal-axis marine current turbine is one of the machines used to harness marine current energy, which appears to be the most technologically and economically viable one at this stage. A number of large-scale marine current turbines rated at more than 1 MW have been deployed around the World. Parallel to the development of industry, academic research on horizontal-axis marine current turbines has also shown positive growth. This paper reviews previous research on horizontal-axis marine current turbines and provides a concise overview for future researchers who might be interested in horizontal-axis marine current turbines. The review covers several main aspects, such as: energy assessment, turbine design, wakes, generators, novel modifications and environmental impact. Future trends for research on horizontal-axis marine current turbines are also discussed.

Link

Leave a comment

Filed under Sector Overview