power factor correction and inverter

Discussion in 'General Electronics Chat' started by robert.guttormson, Jul 5, 2010.

  1. robert.guttormson

    Thread Starter New Member

    Oct 3, 2009
    26
    0
    Hi,

    I am considering buying the Xantrex Grid tie 5.0 inverter

    http://www.altestore.com/store/Inve...tts/Xantrex-Pv5208-5Kw-208Vac-Inverter/p2226/

    Here i see that there is a row which says Line Power Factor (Above 20% rated power) and all of them seem to achieve pf of 0.99 or above

    In this context, i have a couple of questions
    1. How can they predict 0.99 when they dont know the nature of loads(inductive or how inductive/capacitive) that would be connected
    2. There are also some pfc correctors in the market htat you can plug it into a socket and the pf would be corrected, how do those work ?

    TIA,
    Bob
     
  2. Jony130

    AAC Fanatic!

    Feb 17, 2009
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  3. robert.guttormson

    Thread Starter New Member

    Oct 3, 2009
    26
    0
    Hi,
    The link below does pf correction for SMPS system, the output is DC. I am wondering how dynamic/active AC power factor correction can be made for an AC in/out circuit without any intermediate DC stage involve. An example of passive PFC is given in the all about circuits book
    http://www.allaboutcircuits.com/vol_2/chpt_11/3.html

    but if we need to do this dynamically based on the pf distortion created by an unknown reactive load how is it accomplished.

    TIA
     
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