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Eirgrid raises System Non-Synchronous Penetration limit to 75%

  • 08-04-2022 8:47pm
    Moderators, Education Moderators, Home & Garden Moderators Posts: 7,615 Mod ✭✭✭✭ Jonathan

    Eirgrid have announced that they have raised the System Non-Synchronous Penetration (SNSP) limit to 75%. This is great news as it means less fossil fuel plants need to be running during periods of high wind.


  • Registered Users Posts: 1,855 ✭✭✭ bullit_dodger

    That's impressive.

    While I've an engineering background, and I don't fully understand the details there, I know enough to know enough (LOL) that balancing the grid at those levels is tricky.

  • Moderators, Education Moderators, Home & Garden Moderators Posts: 7,615 Mod ✭✭✭✭ Jonathan

    The new synchronous condenser at Moneypoint isn't commissioned yet either, so once online that will enable Eirgrid to raise the limit even further.

  • Registered Users Posts: 7,895 ✭✭✭ the_amazing_raisin

    One good explanation I heard was that the frequency and generation is a two way street, if the frequency goes out of bounds it actually creates something like a drag force on the generators and can damage them

    Things like steam turbines have a lot of intertia when they're running so they can kind of smooth out any variations themselves

    Wind turbines and don't have that same ability and are a bit noisy by design anyway so that why they can't absorb frequency variations

    Having said that I think the Hywind project in Scotland got around a lot of problems by having a battery onshore just before the grid connection. It fairly small, around 1MWh, but helps do grid balancing for the turbines