Power & Energy Solutions

The premier renewable energy publication

Unique system saves time and money for the wind power industry Swedish Actsafe is the company behind the world's first power ascender, a personal elevator that climbs a standard rope. The company is now the market leader within this growing segment of rope access and is continuously developing solutions for making working at height safe, efficient and easy.{pagebreak}"The wind power industry is a market with big growing potential for us. Rope access as an alternative, is gaining ground in many industries - partly thanks to the advantages of the power ascender - and work on wind turbines is one area where the technique has been proven extremely useful," say's Magnus Glans, Vice President of Actsafe.Advantages for the wind power industryPower ascender systems are a flexible and low-cost alternative to scaffolding, lifts and powered platforms. The system allows rapid installation and dismantling, hence there will be minimal interruption time. A power ascender system is a flexible alternative to manual climbing and less costly than standard lift equipment for lightweight jobs.The short set-up time result in minimal shutdown of the turbine. Repair and maintenance can be done in a manner that is quick, safe and less expensive than if performed with, for

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Dipl.-Ing. Kirsten Tschauder, Deutsche BP AG Unplanned wind turbine downtime can lead to high financial losses and wind energy market statistics indicate that the average turbine downtime due to unscheduled events is around 270 hours per year. Roughly one third of such losses can be minimised or avoided by considering the special ambient and application conditions that the turbine operates in and choosing the correct lubricant and application method.{pagebreak}In addition, the right choice of lubricants can improve turbine operating performance through extended lubricant life, increased component life, lower operating temperatures and lower noise levels.Rapid developments in gear box design sets new benchmarkTechnological developments in the wind turbine sector have significantly impacted the design of gear boxes over the last 10 years. This in turn has had a major influence on gear box lubrication and the required performance from gear oils. These now need to operate in more highly- loaded and demanding conditions for extended periods to maximise the operating availability of the wind turbine. Some of the main changes in gearbox design are listed below:

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As the world entered a new millennium, Dr. Peter Volkmer discovered that condition monitoring of the rotor blades of wind turbines not only reduces risks but also pays for itself. At the time, systems monitoring the power train were already available and so the obvious question was why the most stressed parts of a wind turbine, the blades, remained unmonitored. This idea has been developed and Dr. Volkmer explains to PES the all round benefits of BLADEcontrol.{pagebreak}Being a physicist, Dr. Volkmer thought of possible solutions and chose an approach common in power plant engineering: The analysis of variations of natural frequencies. The method is routinely used in conjunction with other technical systems such as steam turbine vanes and aerofoils.Natural Oscillation of Elastic BodiesThe basis of this technological development is the physical phenomenon of mechanical natural oscillation. Each elastic body vibrates when appropriately stimulated, just as a wine glass gives a tone when clinked.

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Angelika Pullen, Policy & Communications Director, Global Wind Energy Council.With wind power predicted to deliver 34% of the world's electricity by 2050, Angelika Pullen takes a look at how the future of energy is not only bright, but also decidedly green. Corporate leaders are walking a different path in their efforts to reduce carbon footprints, in a bid to ensure their companies remain one step ahead of the competition. Is corporate policy finally blowing in a different direction?{pagebreak}The Global Energy ChallengeThe 21st century will be marked by a 'Global Energy Challenge' that requires urgent action in three areas: tackling the threat of climate change, meeting the rising demand for energy and safeguarding the security of energy supply.World energy demand is expected to grow at a staggering rate over the next 25 years. In it's recently published World Energy Outlook 2006, the International Energy Agency (IEA) predicts that the world's energy needs will grow by over 50% by 2030. Increasingly, Governments are realising the threats that the current shaky supply situation is posing to their economic growth. Over-reliance on energy imports from few, mostly politically unstable countries and volatile oil and gas prices are already now inflicting a multi-billion euro drain

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When Size MattersHarry Kyogoku, Zephyr CorporationWhen it comes to creating renewable energy, the Zephyr Corporation has learnt that size is now more important than ever before. Founded in 1997, the Japanese firm's success has soared with a continued growth in sales of their Micro Wind Generators and Airdolphin models. With the European market top of their agenda, the corporation's success shows no signs of slowing down, however, Harry Kyogoku explains why they are interested in selling a little closer to home.{pagebreak}At Zephyr, our aim is to encourage growth within the domestic market and this is looking more and more likely. The private sector accounts for 40% of total sales of Zephyr in Japan, with their attentions steered firmly toward the environment. The public sector, including government and municipalities make up a further 20%, as do schools, and the remaining 20% is bought by customised applications such as: mountain lodges, remote surveillance monitors and emergency use. Despite having been established for more than 20 years, the small wind generator (SWG) market is still to get off the ground on a global basis. However, as the recent entry of powerful new products in progress in Europe, USA and Japan has shown, the

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Don't waste your energy.Soren Qvist Vestesen discusses how a Vestesen A/S Danvest Wind Diesel System can slash operational and maintenance costs, maximise output potential and cut down on waste energy, with an easily managed automatic back-up system Based in Denmark, Vestesen.{pagebreak}A/S is one of the world's leading technology specialists for wind-diesel systems with high wind penetration. Previous and in-hand projects range from 100 to 10,000 kW. With contacts worldwide, the company has full access to the global market, working in remote areas on every continent. In remote areas, electricity is commonly not connected to a grid, meaning power supply can unreliable and very expensive. This is where Vestesen can step in to deliver individually adapted wind-diesel systems to produce inexpensive, high-quality electricity 100% of the time. Under normal circumstances, wind turbines will reduce diesel consumption in such areas by 50-90%.Wind energy facts.Wind energy is one of the cleanest and most cost-efficient sources of energy available today, so, in areas of high wind potential, it makes absolute sense to generate energy through wind turbines. A wind year will typically feature around 1,000 hours of calm wind speeds of 0- 5 m/sec, 6,500 hours of moderate 5-10 m/sec wind speeds, around 1,000

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Innovative technology for excellent resultsAt ENERCON GmbH in Emden, Germany, tailor-made, high-performance solutions optimise precast segment production, says Bastian Bicher, Corporate Product Engineer for Concrete at Sika Services AG's renewable energy branch.As the threat of global warming has become a matter of urgency, so the race to lower greenhouse gas emissions has gained momentum. A natural knock-on effect of this is that the renewable energy sectors are receiving a lot more attention than they ever have before. The target is to achieve a sustainable energy mix, which requires the development of a sturdy renewable industry.{pagebreak}The latest assessment report of the United Nations states that renewable energy should meet 30-35% of electricity demand by 2030. Wind energy will play a major role in meeting this target, along with other contenders such as hydropower and solar power. The key will be the development of new renewable energy sources and the continuous enhancement of economically viable production methods for the established sources including wind energy.ENERCON GmbH is the market leader in Germany and worldwide number three for wind turbine production. The company started to build concrete towers, using prestressed precast concrete segments, in 2000. Today, precast segments are produced in Magdeburg and Emden,

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Smart meters are key to cutting domestic energy consumption. Dr Thomas Dittrich of Tadiran Batteries explains how his production line plays a vital role in the value chain, offering durability and cost efficiency through sophisticated technology.{pagebreak}Smart meters make it possible to cut energy consumption by as much as 10-15%, making a huge contribution towards energy efficiency and climate protection. To guarantee a reliable, low-maintenance life-cycle of up to 20 years requires high-quality, reliable small parts, including batteries.Tadiran batteries are sealed by means of a hermetic glass-to-metal seal. The battery's suitability can be verified within a reasonable space of time using various tests. Test results are supported by practical experience with batteries that have been in use for more than 20 years.Batteries for back-up and RTCSmart electricity meters require a real-time clock (RTC) that continues to run in the event of a power cut - a function that requires a back-up battery.

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