Alternative Energy

Alternative Energy

Alternative energy news, and information about renewable energy technologies.

Sep 15

Protecting Wind Generators During Voltage Dips

Posted in Energy Inventions | Wind Power | Wind Turbines

Wind Generators Wind turbines experience problem due to sudden drop in voltage in a portion of the electric grid. Industrial engineer and member of INGEPER Research Team at the Public University of Navarre, Jesús López Taberna is trying to tackle this problem. His team has come out with a rotor model which predicts how the wind power units will behave under these circumstances. Mr López has already patented two techniques and one of which is already with a manufacturer who will utilize it internationally. They have designed generator turbines in such a way that when voltage dips occur, generators continue to function uninterrupted.


In his PhD, Jesús López Taberna presented two protection techniques so that wind generators continue to be operative despite breaks in electricity supply. The title of the PhD is: “The Behaviour Of Wind-Powered Generators With Double-Fed Asynchronous Motor During Voltage Dips”.

Over the past few years wind energy converters were not performing optimally. The most important difficulty is how wind generators will behave during voltage dips. A voltage drip is an unexpected cutback in the potential in the electric grid followed by a rapid return to its normal value. Voltage drips can be caused by lightening, falling of trees on power cables or any commercial unit consuming a huge power chunk suddenly. This voltage drop lasts for a few milliseconds. But these few milliseconds are very crucial for a machine. In fact, an interruption of half a second in a productive process can cause the whole process to block and it may have to be reinitiated.

Voltage drops can destroy the electronic part of the unit or it can get burnt, hence the need for a protection system. Currently wind generators have a “Crowbar” protection system which can protect the machine but its biggest disadvantage is that the machine comes to a halt. If a large commercial unit suddenly devours a lot of power the voltage dips and wind power units get disconnected and stop producing electricity. This situation makes it difficult for the voltage to reach its normal level. If problem persists for a day or two then one can imagine the seriousness of the problem. The research team is working to make the air generator behave as a conventional power station. A conventional station doesn’t disconnect during power failure but helps in getting grid voltage back up.

The research team is trying to find out solutions that enhance the behavior of the machine without any need to change anything except the control. Analogy can be drawn from a digitally generated text document. A new software version is introduced but you don’t have to change your PC to avail the benefits of the new version.

Jesús López Taberna has specifically proposed two systems of protection in his PhD thesis, and both have been patented. The first, only requiring changing the control of the machine converter, has been transferred to a manufacturer for introduction into wind parks worldwide; the other requires changing elements inside the machine and continues to be developed for applications in new creation wind generators.

  • http://energyinventors.com Rich Goldstein

    This is a significant problem, which only increases as a larger percentage of our electricity needs are met with wind generated power.

    Just this past Tuesday, two U.S. companies received patents for separate approaches to this problem.

    You can find more details at: http://tinyurl.com/4ffu5w

  • http://www.facebook.com/jthorn001 Jeff Thorn

    Seems a hydrogen generator should be hooked up to the unit with a load monitoring and control unit so that when the load drops the hydrogen generator units can be brought on line to maintain a load consistent with the generating capacity… Only the hydrogen generators are not readily available commercially..

  • daisy

    Wow i didn’t know that wind energy is so great for us and the environment!!!


Tree Shaped Wind Turbines to be Installed in Paris

wind-turbine-tree-leaves

A French company called New Wind is installing tree-shaped wind turbines at the Place de la Concorde in Paris, France. The company’s founder, Jérôme Michaud-Larivière came up with the idea

The Eiffel Tower Installs Two Wind Turbines

eiffel-tower-wind-turbines

The 126 year old Eiffel Tower is going green! A pair of camouflaged VisionAIR5 wind turbines were installed inside the scaffolding on the second floor, and are expected to generate

The Lateral Axis Wind Turbine

Lateral Axis Wind Turbine Concept

Sri Lankan inventor Leelananda Jayasuriya just sent us this concept for a Lateral Axis Wind Turbine. The turbine functions just like a Ferris Wheel, with the blades orbiting in

Increasing the Efficiency of Wind Turbine Blades

Increasing the Efficiency of Wind Turbine Blades

To ensure wind turbines that are big in size work in a better manner, a new kind of air-flow technology may soon be introduced. Apart from other aspects,

The Wind Energy Industry is Nothing New

The Wind Energy Industry is Nothing New

Though our scientists may claim that they are inventing something new by using wind as a source of generating energy, the truth is that wind is being used for

South Korea Planning Massive Off Shore Wind Farm

South Korea Planning Massive Off Shore Wind Farm

Wind energy currently meets a mere 1.5% of global electricity generation. But scientists foresee a lot of potential in this alternative energy source. Asian countries are also trying to

Wind Energy Instruments getting Bigger & Better

Wind Energy Instruments getting Bigger & Better

Renewable energy production and demand growth is gaining momentum in many ways across the world. There is a booming demand of wind power today and all wind energy equipment

Fresh-Water Wind Farm on Lake Erie

Fresh-Water Wind Farm on Lake Erie

A fresh-water wind farm is taking shape at Lake Erie and when completed will provide 20 megawatts and get on to about one gigawatt power by 2020. Huge individual