Maximum Power Point Tracking

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  • System2
    System2 Posts: 6,290 admin
    #32
    Re: Maximum Power Point Tracking
    _OS_ wrote: »
    Here is a link to an article in Electronic Design:
    http://electronicdesign.com/Articles/Print.cfm?AD=1&ArticleID=6262


    _OS_,

    I tried the link, but get locked up in an endless loop of advertisements. Any other way of accessing the article?
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  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #33
    Re: Maximum Power Point Tracking

    it's a 20 sec ad. or click on the close box for it.

    http://electronicdesign.com/Articles/Print.cfm?AD=1&AD=1&ArticleID=6262
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • System2
    System2 Posts: 6,290 admin
    #34
    Re: Maximum Power Point Tracking
    mike90045 wrote: »
    it's a 20 sec ad. or click on the close box for it.

    http://electronicdesign.com/Articles/Print.cfm?AD=1&AD=1&ArticleID=6262


    The problem is that after the twenty second ad, there is a segue to another twenty second ad, and the second one seems to be stuck. Clicking to go directly to the mag doesn't work, and the second ad timer goes into negative seconds remaining.

    I had my browser set to reject cookies. Maybe I will try accepting them and see what happens.

    P.S. Yep! That did the trick.
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  • dwh
    dwh Solar Expert Posts: 1,341 ✭✭✭
    #35
    Re: Maximum Power Point Tracking

    Direct link to the article:

    http://electronicdesign.com/Articles/ArticleID/6262/6262.html
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  • entuty
    entuty Registered Users Posts: 10 ✭
    #36
    Re: Maximum Power Point Tracking

    Hi all,
    Can you tell me the role of Vref in the following control diagram?

    untitled-1.jpg

    Thank you for your help!
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  • lorelec
    lorelec Solar Expert Posts: 200 ✭✭
    #37
    Re: Maximum Power Point Tracking

    entuty,

    "Vref" is the reference voltage for your error amplifier (which is represented by that little circle). The role of the error amplifier is to produce an output that, when processed by the subsequent circuitry, will cause Vf (your feedback voltage) to equal Vref ... so, the error amplifier is doing whatever it needs to do (at its output) to make its two inputs equal.

    Vref may be constant or variable. In a power supply with a regulated output, for example, Vref is commonly held constant at 1.25v, and Vf (obtained from a divider on the output of the supply) will also be 1.25v when the output of the supply is at its regulated value. If Vf is greater or less than 1.25v, the error amplifier causes the power supply to readjust its output so that Vf once again equals 1.25v.

    When used with MPPT, Vref will be the product of your tracking algorithm. As such, it will constantly be changing as the location of the power point on the array's power curve changes.

    Marc
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  • entuty
    entuty Registered Users Posts: 10 ✭
    #38
    Re: Maximum Power Point Tracking

    Marc,
    Can I use the output array voltage as the reference voltage?
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  • System2
    System2 Posts: 6,290 admin
    #39
    Re: Maximum Power Point Tracking

    Hi Solar Guppy,

    i am working in solar inverter project. i am understanding a bit about the MPPT and the control electronics. i studied the hill climbing and the Incond algorithms, but struck up in how to implement this algorithm in the real time applications. i am a mechanical engineer, because of renewable energy interest i am doing this. can you help me in this regard? also please post the pdf thesis file once again since that was not opening??

    thanks
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  • Solar Guppy
    Solar Guppy Solar Expert Posts: 1,989 ✭✭✭
    #40
    Re: Maximum Power Point Tracking

    I just tried the link and it still works ...

    That a big leap going from mechanical engineering to power electronics and firmware design. Just an observation that i've worked at a few well know company and their design staff's are masters and phd's in these fields and it is challenging for these folks ... something to keep in mind
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  • boB
    boB Solar Expert Posts: 1,032 ✭✭✭✭
    #41
    Re: Maximum Power Point Tracking
    Solar Guppy wrote: »
    their design staff's are masters and phd's in these fields and it is challenging for these folks ...


    yes, it's sorta like rocket science ! ... especially if they blow up... up... and away !! :D
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  • Dave Angelini
    Dave Angelini Solar Expert Posts: 6,917 ✭✭✭✭✭✭
    #42
    Re: Maximum Power Point Tracking

    Probably easier than rocket science as you get to use modern available components. You need a PHD in rocket science to be able to find an LM108, LM118 or the 2N2222 that has been up screened to S level. Talk about prices and only the NSA and the guy's in the windowless white vans can afford it.

    And after all this, they still blow up!
    "we go where power lines don't" Sierra Nevada mountain area
       htps://offgridsolar1.com/
    E-mail offgridsolar@sti.net

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