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How is instantaneous power adjusted in the electrical grid?

  1. Jan 14, 2017 #1

    ORF

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    Hello

    I didn't find a similar question, but if it's redundant, please erase this thread.

    The instant electrical power is not constant (because of the consumption and of the production). So, how the instant power is adjusted in the electrical grid?

    There is a similar entry, but it has several open questions:
    -> I have heard that in case of surplus, the electrical power is derived to ground, but this seems weird to me. Is it true?
    -> They talk about the speed of the electrical power; how fast is the electrical power transfer? (post10).

    Thank you in advance :)

    Greetings.
     
  2. jcsd
  3. Jan 14, 2017 #2

    mfb

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    @anorlunda wrote an insights article about AC networks. On the timescale of seconds, the generators in power plants act as flywheels. Over longer timescales, various power plants regulate their power, especially hydro and gas power plants can quickly switch on/off.
     
  4. Jan 14, 2017 #3

    cnh1995

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    Homework Helper

  5. Jan 14, 2017 #4

    ORF

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    @mfb: Oh, I didn't notice that article. Thank you :)

    Just to keep in mind some number... what is the electrical power speed for a typical electrical grid? (I don't know the typical parameters of reactance and resistance for an electrical grid)

    @cnh1995: thank you for the thread. I'm not an electrical engineer, so it's a bit harder for me following it.
     
  6. Jan 14, 2017 #5

    mfb

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    The propagation speed for changes in voltages in cables is typically 2/3 c. The effective speed can be different in complex networks.
     
  7. Jan 14, 2017 #6

    ORF

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    Ok, thank you :)

    The last stupid question of the thread (I promise): the speed of electrical power transfer is the same as the speed for changes in voltages?
     
  8. Jan 14, 2017 #7

    anorlunda

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    Yes, that's correct.
     
  9. Jan 14, 2017 #8

    ORF

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  10. Jan 14, 2017 #9

    anorlunda

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