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Solution to spinning reserve concerns

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  • Ruin Sven
    Regarding the discussion on windpower and spinning reserve, there are wind systems that can handle this very well. Like Andrew Tuckey wrote, a main issue in
    Message 1 of 1 , Jul 9, 2001
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      Regarding the discussion on windpower and spinning reserve, there are wind
      systems that can handle this very well.

      Like Andrew Tuckey wrote, a main issue in small grids is how to overcome
      quick drops in windpower output. One way to do this is to use the rotational
      energy of the wind turbine as short-term energy storage (~10 seconds with
      suitable wind turbines). With a special control system, power output can
      then be controlled to match the needs of the grid and reduce spinning
      reserve.

      This concept was originally developed by Chalmers University of Technology
      in Sweden. It has been demonstrated in a wind-diesel system on the island
      Svenska Högarna, where 3/4 of the electricity is produced by the wind
      turbine (one year average). When the wind speed exceeds 6 m/s, the diesel
      can be shut down and the wind turbine controlls the frequency of the grid.
      The concept has been further developed for commercial introduction in hybrid
      systems by our company, ÅF, in cooperation with Chalmers. It is a low-cost
      solution where no large batteries, dump loads, or special-built gensets are
      needed.

      To work with this concept, wind turbines must have variable speed and pitch
      control. It is also of benefit with a large turbine diameter (large
      inertia), in comparison to the generator rated power, and a high rotational
      speed. The most suitable machines we know on the market are the PitchWind
      20-30 kW wind turbines.

      The control system developed by ÅF can control the wind turbine(s) and
      diesel genset(s) in the local grid. It is built in a flexible way, so it can
      easily be adapted for different configurations and other power plants. The
      control system is based on LonWorks, recognized internationally as a
      standard for open, interoperable control networks.

      Using many smaller wind turbines instead of one big wind turbine can also
      help reduce spinning reserve.

      Sven Ruin
      Wind energy consultant

      ÅF-Industriteknik AB
      Skalholtsg. 2
      P.O. Box 35
      SE-16493 Kista, Sweden
      Tel: +46-8-657 15 46
      Fax: +46-8-657 37 01
      E-mail: sven.ruin@...
      www.af.se
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