- Category: Articles
Dry-Type Transformers versus High Temperature Liquid-Filled Transformers
![Image Image](/images/stories/Features/AprilMay05/pauwels.jpg)
By Jan Declercq and Raymond Van Schevensteen, Pauwels International NV, Belgium
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- 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
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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![Image Image](/images/stories/Features/AprilMay05/proco1.jpg)
By Luiz Procopiak, LACTEC, Brazil
- Category: Articles
Valuable Data for the Wind Power Industry
![Image Image](/images/stories/Features/AprilMay05/noaa.jpg)
By Avery Sen, Policy Analyst and ORISE Fellow, National Oceanic and Atmospheric Administration
- Category: Articles
Optimising Capacitors for Wind Power Applications
![Image Image](/images/stories/Features/vshy073?fig?3 (2).jpg)
By Josef Reindl, Vishay ESTA, Theo van de Steeg and Frans van Roemburg, Vishay BCcomponents
- Category: Articles
A Commentary on the Issues Facing Wind Park Developers in the UK
The UK offshore wind energy sector is booming at the moment. This is largely because of the UK government’s ‘Renewables Obligation’ targets for the generation of electricity from renewable sources of 10% by 2010 and 15% by 2015. As the windiest country in Europe, the UK is in a very good position to fulfil the targets by installing many wind parks in the relatively shallow waters extending into the North Sea. In this article, the author describes the legal implications for offshore wind farms.
By Jonathan Lux, Partner, Ince & Co, UK
- Category: Articles
Case Study and Cost–Benefit Analysis on Implementation of CBM
The focus of this case study and cost–benefit analysis is an application of a condition-based monitoring (CBM) tool installed in a 700kW wind turbine generator at a project based in the USA. The installation was in response to reports that several wind farms had experienced catastrophic gearbox failures, resulting in exorbitant costs and lost revenues. It began in summer 2003 with a cooperative pilot study, the objective being implementation of a ‘trial installation’ that would demonstrate the benefits of a CBM system on a wind turbine to help prevent catastrophic failures.
By Staff Writer, Prasentia, and Roland Kewitsch, Product Manager, Schenck-Trebel, USA