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Net Metering

  1. Oct 21, 2013 #1

    rollingstein

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    I was reading up on net metering, where the electric utility allows one to feed back excess generation by solar panels etc. onto the distribution network.

    http://en.wikipedia.org/wiki/Net_metering

    One question I had is, is it fairly easy to match phase for such inverters with the grid? How do they do it. These seem pretty small domestic units.

    http://en.wikipedia.org/wiki/File:Feed-in_Tariff_meter_connections.jpg [Broken]
     
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Oct 21, 2013 #2

    UltrafastPED

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    They contain special circuitry to precisely match the voltage and frequency of the grid. IEEE 1547 is the standard which describes the requirements and testing: http://grouper.ieee.org/groups/scc21/dr_shared/ [Broken]

    Here is some information on grid-tie inverters:
    http://en.wikipedia.org/wiki/Solar_inverter

    And a readable technical report with cost estimates for entire systems:
    http://www.eecs.berkeley.edu/~phucle/EE_290N/290N_report.pdf [Broken]
     
    Last edited by a moderator: May 6, 2017
  4. Oct 21, 2013 #3

    dlgoff

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    Another thing to consider about these inverter applications (i.e. grid ties) is safety. If the inverter doesn't detect the correct voltage from the utility, say during a power outage, they open the disconnect. You wouldn't want to hurt some utility worker doing work on a line they thought wasn't energized.
     
  5. Oct 21, 2013 #4

    rollingstein

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    Thanks for the info.

    I learnt a lot of new stuff, especially the islanding bit.

    The documents seem a bit light on how exactly the phase matching is done. I'm intrigued because so far I was under the impression that precise phase matching was an expensive & time consuming activity & so am surprised that a $200 box can take care of it.
     
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