- Category: Articles
Valuable Data for the Wind Power Industry

By Avery Sen, Policy Analyst and ORISE Fellow, National Oceanic and Atmospheric Administration
- Category: Articles
Development of a Methodology for Wind Resource Assessment
Since 1995, COPEL (the local utility of the State of Paraná, Brazil) has been developing, in partnership with LACTEC and CAMARGO SCHUBERT, research and development projects in the area of wind energy. In 1999, the project named ‘Projeto VENTAR’ introduced the ‘Wind energy resource map of the State of Paraná’. In line with the global growth of renewable energy utilisation, and the beginning of the Brazilian wind energy market, COPEL has developed a methodology to support feasibility analyses of wind farm projects in Brazil. The author gives a description of the methodology and results achieved.
By Luiz Procopiak, LACTEC, Brazil
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By Luiz Procopiak, LACTEC, Brazil
- Category: Articles
Expanding the Speed Range with the Doubly-Fed Induction Generator
Developments in power electronics, electrical drives and wind turbines have allowed an increase in the power of wind systems. The need to limit mechanical stress and power disturbances has led to strong demand for variable speed systems. In wind generation systems it is necessary to decouple and control active and reactive power flow with fast response because of mains requirements. Fast and accurate control is especially important when the induction machine is designed to operate below synchronism rotational speed as a generator. This article describes a controller that can extract power from wind kinetic energy over a large speed range, at both sub- and hyper-synchronism speeds.
By Paulo Costa, António Martins and Adriano Carvalho, Portugal
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By Paulo Costa, António Martins and Adriano Carvalho, Portugal
- Category: Articles
Dry-Type Transformers versus High Temperature Liquid-Filled Transformers

By Jan Declercq and Raymond Van Schevensteen, Pauwels International NV, Belgium
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- Category: Articles
More Sustainable Financing of Wind Power Projects through Improved Annual Energy Production Estimates

By Paul van Lieshout, Wind Power Group Manager, Sinclair Knight Merz (Europe) Ltd, UK
- Category: Articles
Optimisation of Foundation Schemes in Terms of Overall Economic Viability
Over 15% of the cost of an offshore wind turbine is usually attributable to the foundations.
Foundation installation and erection of the turbine constitutes one of the greatest areas of risk for an offshore development, because of the problems posed by working in an often difficult marine environment. Developing alternative foundation systems and addressing installation techniques that are less weather sensitive will have a direct and significant impact on the economic viability of offshore wind farm schemes. Results of studies for several offshore wind sites are presented in this article to demonstrate the savings that can be made by innovative thinking in terms of foundation design and construction. Relative costs of foundation systems are compared for differing seabed conditions, together with an assessment of the associated risks in terms of certainty of out-turn costs and schedule.

By Rachel Nicholls, Associate, Arup, USA
- Wind Speed at Light Speed
- New Zealand’s Winds Harnessed
- Offshore Wind Farm Construction
- Comparing Models for Energy Output Estimation
- Sensors for Today’s Turbines
- Lubricant and Debris Analysis for Wind Turbines
- Electrical Transmission System for Offshore Wind Farms
- Carbon Credits and Wind Power
- Wind Energy Condition-Based Monitoring
- Offshore Wind Energy and UK Law
- Next-Generation Capacitors
- Scira Offshore Energy
- An Integrated Monitoring System for Offshore Wind Farms