Posts Tagged ‘Wind Turbines’

Spain Wind Power Development

September 6, 2010

Today Monday, we had another presentation. This time we had to speak about the Wind Power industry in our countries. As you can guess, Spain holds a privileged position in the world with our fourth place.

Again, here is the presentation I have just shown to teachers and the rest of students. Now we need to write the reports and they must contain further information. So, let’s start as soon as possible. :-)

Adopt a Wind Turbine.

July 13, 2010

The EWEA (European Wind Energy Association) started a campaign to promote the wind energy, called Fresh Air. On this website is possible to choose an installed European wind turbine and “adopt” it. It is FREE cost, and the goal is to make people more conscious on Wind Power’s benefits. You can adopt just one wind turbine for each email, so I suggest you to be sure which one you select. Are you interested to adopt a wind turbine? What are you waiting for?

According to this campaign, the video show us interesting facts on Wind Power sector and the potential of wind energy to satisfy the energy market demand without CO2 emissions. Today, Wind Power represents the 4% in the EU electricity, and in 2030 it is expected to increase that proportion to 35%. Strategic investment for a continent as Europe which is so shortfall of conventional energy resources.

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Power Quality Standards.

July 13, 2010

Voltage provided by Wind turbines must comply some requirements specified in the IEC 61400-21 standard. Here we are some power quality parameters that power energy from wind turbines must be under control:

Rated Data

  • Rated Power (Pn) (or Active Power): Maximum continuous electric output power for a wind turbine under operating conditions.
  • Rated Reactive Power (Q­­­­­n): Reactive power under rated power, nominal voltage and frequency.
  • Rate Apparent Power (Sn): Apparent power from the wind turbine while operating at rated power and nominal voltage and frequency.
  • Rated Current (In): Current from the wind turbine while operating at rated power and nominal voltage a frequency.

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Brake Systems in Wind Turbines

July 12, 2010


According to quality parameters, DS472 (Danish Standard) and GL rules, wind turbines must have two independent braking systems. However, the IEC 61400-1 requirement does not specify what kind of two braking systems must have, but requires the protection system to remain effective even after the failure of any non-safe-life protection system component.

Usually, it makes sense to supply both aerodynamic and mechanical braking. Aerodynamic brake is more benign than mechanical braking, so it is always used in normal shut-downs. On the other side, although a braking system must be used during shut-downs, sometimes technicians allow rotor free turns (idle) within low winds. This strategy reduces the frequency of imposition of braking loads on the gear train.

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Types of Commercial Wind Turbines.

July 8, 2010


We already saw the different wind turbines we can find nowadays, from the HAWT to VAWT. However, the most commercial at this moment are the High Tip Speed Ratio HAWT. In this post, we are going to describe the different models of wind turbines and what kind of technology they use to convert the mechanical energy to electric energy.

If we pay attention at the above table, we can see there are two wind turbines models according to their Speed Control and Power Control. Thereby, we can find four models: Type A, Type B, Type C, and Type D (see the below diagram). There are three variants for the Type A (A1,A2 and A3). Although it would be possible to manufacture the same variations for the B, C and D Types, it would be not worthy (from the commercial point of view) because these models lack the capability for a fast reduction of power (see the grey-colored boxes in the first diagram). Let´s start describing the possibilities to control the power the aerodynamic forces on the turbine rotor.

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What’s inside a wind turbine?

July 7, 2010

This video posted on Youtube.com has sparked my attention. Firstly, because there are not so many videos like this that explains the main parts of a wind turbine, and second because it is worthy and is well-structured. The video is made by UVSAR, a British company which provides technical services for all those involve in work at height.

The video shows us the layout of two typical wind turbine generators, from the transformer at the floor level, ladders (or elevators), to the electrical cables attached to the walls of the tower.

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Types of Wind Turbines.

July 3, 2010

Wind Turbines can be classified in two big groups: HAWT (Horizontal Axis Wind Turbines) which its rotor is connected to a horizontal shaft, and VAWT (Vertical Axis Wind Turbines) which have a vertical shaft.

HAWT

Since 1980’s, most of the commercial wind turbines are included in this group. The HAWT consist of a tower and a nacelle that is mounted on the top of the tower. The nacelle contains the generator, gearbox and the rotor.

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The Wind.

June 29, 2010

Earth is surrounded by a fluid that we call air. When air is heated creates High pressures in the atmosphere, and wind flows from High (H) to Low (L) pressure points. But, why does our planet have different temperatures? And even the most important, how can we take advantage of this natural power? In order to explain these questions, on this post we will see how wind acts and the latest researches on the aerodynamic field to convert the wind power in a useful and ecological energy.

There are some reasons to explain why the atmosphere has temperature gradients. Since Christopher Columbus discovered that Earth is a sphere (or almost) five hundred years ago, now we can understand easily that Sun’s radiations impinge on the surface with different power depending on the latitudes. Also, we have the rotation. When the Earth’s face is in front of the Sun, it means that the another face is in the dark, and as we know, days are usually warmer than nights. Finally, our planet’s axis is inclined and when it is summer in the North means it is winter in the South. Furthermore, our planet has other peculiarities (clouds, oceans which keep better the heat than land, white glaciers, so on) that provoke High and Low pressures in the atmosphere.

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Historical Background of the Wind Power

June 28, 2010

History of Wind Power.

We believe that some kinds of windmills were used in China and Japan 3.000 years ago, but the first well-documented windmill in the world was built in Persia around the 10th Century BC. Although it was very rudimentary (a mud cabin in order to increase the wind force on a side of the mat), it was enough to grind grain. However, it was in Europe where windmills had the most important improvements from the 12th Century with horizontal axis, cogwheels, and even sometimes the whole mill could be turned into the wind direction by using levels or oxen.

Those advantages let Medieval people to relieve the feudal oppression (wind was free instead watermills), and windmills were very popular along the countryside in Netherland, England, Germany, France, and of course, Spain. In addition, the wind wheel also has a very important role to colonize the prairies in America by pumping water to tanks in 18th and 19th centuries.

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Links & Sources.

June 27, 2010

Information.

Information usually has a very important role in our lives. If we could find the answer for our questions or queries in an efficient way we could accomplish easier our dreams. Internet has helped us very much and nowadays when we need to find new information our first idea is to use Search Engines such us Google or Yahoo.

However, it is very frequently when we are looking for something specific on Internet, we finish on worthless websites and forgetting what our purpose was. So, in order to make easier this task, we are going to show a list of websites that we can help us.

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