News
Editorial Features
Subscription Services
Magazine Profile
Advertising
Events
Previous Issues
Jobs
Newsletters
WWEA Page
 

Get the latest news by RSS news feed

 

Register here to receive our newsletter and to access old issues






Lost Password?
No account yet? Register

As registered user you are also able to submit news to us through this site


Triton Market Leading
Features
Viability of Sodar for Long-Term Resource Assessment Print E-mail
Monday, 01 September 2008
An Analysis of Data from the Triton Sonic Wind Profiler

Second WindThe met mast is dead. Long live sodar! While it is early to make this statement emphatically, data from field tests indicates that a new generation of sodar technology is poised to replace meteorological masts for many assessment applications. This article reports on data from customers using Second Wind's Triton® sonic wind profiler in eight diverse locations. The findings show reliable reporting of valid wind data at heights that encompass the full blade sweep of commercial wind turbines. Gross data recovery was above 95%, correlation to anemometry at 60 metres was 0.97, and signal-to-noise ratios were greater than 9 at heights up to 160 metres.

By Liz Walls and Walter Sass, Second Wind, USA
 
Offshore Wind Print E-mail
Monday, 01 September 2008
Can the Grid Deliver?

EconnectRecent years have seen significant reductions in the commercial viability of UK wind farm development as a consequence of factors such as limited availability of turbines, increases in metal prices, reduced availability of skilled support for construction operations and grid access constraints. Despite this, the excellent wind resource and shallow waters around the UK ensure that offshore development is seen by government and the renewables industry as the most significant opportunity to realise very ambitious renewable energy targets and aspirations.

By James Hunt, Econnect, UK
 
Converter Technology for More Wind Print E-mail
Monday, 01 September 2008
An Efficient Grid Interface for Permanent Magnet Generators Using Series Compensation

WiikNowadays, power electronics is an essential technology for enabling variable speed operation of wind turbines with increased energy capture and reduced mechanical stress. The commonly used doubly-fed induction generator only needs a small rated converter to enable variable speed operation and has a correspondingly low cost. On the other hand, permanent magnet (PM) generators have advantages such as no slip rings, high efficiency and the possibility of gearless operation. Their drawback is the need for a large power electronics converter, as the full power must be converted into voltage of fixed frequency suitable for the connection to the grid. This drawback motivates the search for new configurations with reduced losses, costs and space requirements. In this article, a new configuration using a variable series capacitor is investigated. The configuration shows simple control, low losses and a reduced need for semiconductor rating, and thus contributes to the technology shift towards permanent magnet generator solutions.

By Jan Arild Wiik and Ryuichi Shimada, Tokyo Institute of Technology, Japan
 
Controlling and Monitoring the Aviation Beacon System Print E-mail
Monday, 01 September 2008
Use of the Moeller PLC with a Fibre-Optic Fieldbus within Enercon Wind Power Turbines

MoellerEnercon develops and produces gearless wind power turbines that are a benchmark for the market in terms of power, reliability and lifespan. Therefore, research and development at Enercon determines the level of innovation. Enercon has chosen Moeller's XC100-FC modular programmable logic controller (PLC) with a fibre-optic CANopen interface for controlling and monitoring its aviation beacon system. This article describes first the controls needed in the wind turbines and then how the modular PLC from Moeller is integrated into such systems.

By Heribert Einwag and Thierry Rosant, Moeller GmbH Bonn, Germany
 
Optimised in The Switch Way Print E-mail
Wednesday, 02 July 2008
The Wind Power Drive Train Package

ImageCombining a permanent magnet (PM) generator with a power converter in a wind power drive train is simple, but nobody integrates them into a totally optimised package as The Switch does. The development of magnetic materials and power switches has made the combination of a PM generator and a full-power converter a very competitive solution for the next-generation wind power systems.

By Jussi Vanhanen, Marketing Manager, The Switch, Finland
 
<< Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >>

Results 46 - 54 of 180
 
© Windtech International 2004-2010