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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
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Renewable Energy: Grid Tie inverters

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  1.  
    • CommentAuthorworkaholic
    • CommentTimeNov 22nd 2007
     
    I am planning to install some PV and a wind turbine both using Grid Tie inverters. I understand that you can connect the outputs of the Grid Tie inverters in parallel and that they will disconnect themselves in the event of a power cut. What happens if your main Grid supply becomes disconnected rather than a power cut. You now have two inverters both running. Will each one "think" that the other is the Grid and therefore keep working?
    • CommentAuthorchuckey
    • CommentTimeNov 22nd 2007
     
    As there must be a breaker between their output and the "grid" for maintenance and for safety puposes, one would think that the situation should be covered by the units. I would think that that they would continue to run but would not actually produce any power.
    Frank
    •  
      CommentAuthorted
    • CommentTimeNov 23rd 2007
     
    Inverters that are certified for grid tie use incorporate a feature specifically to prevent this from happening. It's called Frequency Drift Anti-Islanding. As long as the equipment you use is certified G83 (in the UK) compliant you should have no problem.
    • CommentAuthorworkaholic
    • CommentTimeNov 24th 2007
     
    Thanks chuckey and ted.

    I have managed to do a bit more reading on the subject. One thing I found was that despite all our European harmonisation there are different grid failure detection methods used in different countries. You need to beware sourcing equipment out of the UK.

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