Advances in wind power technology

When we talk about renewable energy sources, wind power is considered the most effective resource. There have been so many technological advances in the utilization of wind power resulting in a clean, renewable, cost-effective means of generating electricity. In order to obtain optimal efficiency from the smart grid, advancements in power system is essential.

Newer technologies used in connecting the turbines to the grid can enable us to get better energy production and face the electric disturbances smoothly. Here is a list of 2011’s best technological advances in wind power technology.

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KiteGen looks to get wind-power off the ground

Wind-power has rapidly evolved over the last decade to become a key part of the alternative energy mix with towering rows of turbines now dotting horizons all over the globe. One of the drawbacks to the conventional windmill approach is that they are still low to the ground, so why not go to where the winds are stronger and more consistent – up. Like the Magenn Air Rotor System, KiteGen technology is aiming to do just that. The system generates energy by guiding tethered kites over a predefined flight path in order to rotate a ground based turbine and, while only in the testing and planning phases, it looks to be a promising solution. The large wings (or kites) in the KiteGen system are driven by avionic sensors located in a dome base that also houses an electric generator. The control system is designed to automatically guide the kites in order to rotate the turbine and maximize torque. As altitude increases, average wind speeds increase as well. This is a factor that traditional wind turbines cannot compete against, since they are stationary and are generally only able to reach heights of 100m.

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Airborne Wind Turbine Could Revolutionize Wind Power

Flying a kite has often been considered child’s play, but a group of inventors think the concept could be used to make wind energy cheaper and more reliable than ever before, potentially revolutionizing wind power forever.

energyNOW! correspondent Josh Zepps met the innovators working to turn the idea of flying a kite into an airborne wind turbine that’s lighter and more powerful than traditional wind turbines. The full video is available below:

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The problem with traditional wind turbines is that they aren’t tall enough to reach the stron winds found over 1000 feet above the ground. To remedy that, Makani Power has created a flying wind turbine called the “Wing 7 Aeronautic Power Plant” that can reach heights of 1,500 feet! Spanning eight meters, weighing 130 pounds, and tethered to the ground, the wind turbine can generate 20 kW of energy from 22mph winds. (more…)

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5 flying wind generator design concepts to outshine conventional wind turbines

Imagine the sky all across filled with strange, rotating machines. Well, alternative energy developers are planning exactly that. The wind turbines you see out in the fields or in the backyard might just be rendered useless if these things take to the skies. Planned to be positioned in the skies, sometimes as high as 15,000 feet in the air, these ‘Flying Wind Generators’ are aiming high, and if they manage to harness even one percent of the jet-stream winds, it could be enough energy to light up the whole planet. Here are a few concepts for flying wind generators which might literally blow you away.

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The Kite Wind Generator

It’s an expert estimation that the total energy stored in wind is 100 times higher than actually needed by humans on this earth. The catch is that we have to learn and devise ways to trap this wind power blowing across the planet earth. Experts tell us one more thing that most of the wind energy is available at high altitude and we can’t manufacture turbines of that height. So we have to think of new ways to trap that wind power blowing at a significant height. Some experts estimate that the total energy contained in wind is 100 times the amount needed by everyone on the planet. However, most of this energy is at high altitudes, far beyond the reach of any wind turbine.

Now researchers want to create something like a kite that can float at a higher altitude to trap the wind energy.

Kite Wind Generator
The Kite Wind Generator simply known as KiteGen is an Italian company. They are installing kites that sprout from funnel like structures. They are mounted on giant poles. When wind blows these kites come out of funnels. For short, use kites that spring from funnels on the end of giant poles when the wind blows. For each kite, winches release a pair of high-resistance cables to control direction and angle. These kites are light and ultra-resistant. These kites are similar to those used for kite surfing – light and ultra-resistant, capable of flying up to a height of 2,000 meters.

KiteGen people have thought of new ways to exploit the wind power existing at an altitude. They have discarded the usual heavy and static plants like current wind turbines, but opted for light, dynamic and intelligent ones. They have installed all the light devices in the air and heavy ones on the ground for generating power. The basics of the wind turbines and KiteGen are same. But they have moved the heaviest parts to the ground. They claim that the resulting structure, base foundation included, is much lighter and cheaper. They have also provided flexibility regarding the height of kites. If the wind is strong at certain height, the height of the kite too can be adjusted accordingly. If today wind if blowing nicely at 1000m, say, kites can be adjusted at the same height. If tomorrow the strong wind is blowing at certain other height, wind kites can be flown at that height to gain maximum advantage of the wind power.

The swirling kites prompt KiteGen’s core in motion, and the rotation activates large alternators producing a current. They also have a control system on autopilot. This control system manipulates the flight pattern so that maximum power can be generated be it night or day. The KiteGen people are concerned with the environment too. They don’t want the lives of birds to be affected by their flying kites. So they have installed the advanced radar system that can redirect kites within seconds in case they detect flying of birds.

The cost of the technology is US$750,000 and it won’t takes acres and acres of space like a wind farm. You can install the whole machinery within a diameter of just 100 meters. KiteGen claim that they can produce half a GW of energy, and produce it at a cost of US$2.5 per GW. Its creators, Sequoia Automation, say a 2,000 meter-version would generate 5GW of power.

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Source: alternative-energy
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Flying Wind Farm

How would you like swarms of kite-like airborne turbines spinning at high altitudes sending power down via nano-tube cable tethers to generate power for your community? This could very well be a true picture of future power harvesters according to NASA. A federal fund of $100,000 is being reserved for exploring these high-altitude, nano-tube cable tethered, above-ground wind farms. The project will check all aspects as well as weigh the pros and the cons of a wind farm such as this one.

Envisioned Research by NASA
Mark Moore, aerospace engineer at NASA, outlined this research as a study to look at the practicalities of the idea of air-borne turbines. To know the challenges that will be faced when turbines are working at 30,000 feet above ground level — and what the effect will be on airspace and unmanned aircraft — is what the project is aiming to uncover.

Features of Flying Wind Farms
A prototype planned by Italian start-up TWIND has a pair of balloons at 2,600 feet. The open sails move antagonistically so while one moves downwind the other moves upwind. This movement spins a turbine to generate power. The option of offshore flying wind turbines is also being explored to solve the airspace competition issue.

Advantages Presented
At higher altitudes, wind has more power and velocity and is more consistently predictable. As power generated goes up because of higher wind resistance proportional to the cube of relative velocity, more power can be generated. That works out to be some 8 – 27 times the power produced at ground level. The tethers can haul in the kites/balloons housing the turbines during storms or for general maintenance work. Less pollution is an advantage, as well as the fact that it will not take up much precious ground space for installation.

Challenges Presented
This plan certainly presents plenty of challenges for air traffic and other unmanned aircraft by its need of a minimum 2-mile no-fly zone. The offshore option also has the extra effort of transporting the energy from sea to land-based power plants.

Need for Government Involvement
Since this plan of flying wind farms involves diverse major aspects like sharing airspace, geography, and technology, Moore says that there is a genuine need for government involvement to make this a viable plan. In his words, “We’re trying to create a level playing field of understanding, where all of the concepts and approaches can be compared.”

 

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