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Forum MPPT technology for Solar panel arrays----how to work?
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Related

MPPT technology for Solar panel arrays----how to work?

Jason
Jason over 15 years ago
MPPT-Maximum Power Point Tracker is a technology to find out the Maximum Power Point of the solar cells under the sunlight. do you have any idear to this technology? let's discuss!
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  • Muju4mFrnL
    Muju4mFrnL over 15 years ago
    How a Maximum Power Point Tracker Works:  The Power point tracker is a high frequency DC to DC converter. They take the DC input from the solar panels, change it to high frequency AC, and convert it back down to a different DC voltage and current to exactly match the panels to the batteries. MPPT's operate at very high audio frequencies, usually in the 20-80 kHz range. The advantage of high frequency circuits is that they can be designed with very high efficiency transformers and small components. The design of high frequency circuits can be very tricky because the problems with portions of the circuit "broadcasting" just like a radio transmitter and causing radio and TV interference. Noise isolation and suppression becomes very important.  There are a few non-digital (that is, linear) MPPT's charge controls around. These are much easier and cheaper to build and design than the digital ones. They do improve efficiency somewhat, but overall the efficiency can vary a lot - and we have seen a few lose their "tracking point" and actually get worse. That can happen occasionally if a cloud passed over the panel - the linear circuit searches for the next best point, but then gets too far out on the deep end to find it again when the sun comes out. Thankfully, not many of these around any more.  The power point tracker (and all DC to DC converters) operates by taking the DC input current, changing it to AC, running through a transformer (usually a toroid, a doughnut looking transformer), and then rectifying it back to DC, followed by the output regulator. In most DC to DC converters, this is strictly an electronic process - no real smarts are involved except for some regulation of the output voltage. Charge controllers for solar panels need a lot more smarts as light and temperature conditions vary continuously all day long, and battery voltage changes.  Below is the link to the IR solar battery charger.  http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=6262
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  • Muju4mFrnL
    Muju4mFrnL over 15 years ago
    How a Maximum Power Point Tracker Works:  The Power point tracker is a high frequency DC to DC converter. They take the DC input from the solar panels, change it to high frequency AC, and convert it back down to a different DC voltage and current to exactly match the panels to the batteries. MPPT's operate at very high audio frequencies, usually in the 20-80 kHz range. The advantage of high frequency circuits is that they can be designed with very high efficiency transformers and small components. The design of high frequency circuits can be very tricky because the problems with portions of the circuit "broadcasting" just like a radio transmitter and causing radio and TV interference. Noise isolation and suppression becomes very important.  There are a few non-digital (that is, linear) MPPT's charge controls around. These are much easier and cheaper to build and design than the digital ones. They do improve efficiency somewhat, but overall the efficiency can vary a lot - and we have seen a few lose their "tracking point" and actually get worse. That can happen occasionally if a cloud passed over the panel - the linear circuit searches for the next best point, but then gets too far out on the deep end to find it again when the sun comes out. Thankfully, not many of these around any more.  The power point tracker (and all DC to DC converters) operates by taking the DC input current, changing it to AC, running through a transformer (usually a toroid, a doughnut looking transformer), and then rectifying it back to DC, followed by the output regulator. In most DC to DC converters, this is strictly an electronic process - no real smarts are involved except for some regulation of the output voltage. Charge controllers for solar panels need a lot more smarts as light and temperature conditions vary continuously all day long, and battery voltage changes.  Below is the link to the IR solar battery charger.  http://electronicdesign.com/Articles/Index.cfm?AD=1&ArticleID=6262
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  • Former Member
    Former Member over 12 years ago in reply to Muju4mFrnL

    Hi Basheer,

     

    May i know how actually the maximum power point tracking system work? I mean how to determine the value of the components in boost or buck converter .

    From my knowledge, the input to the dc-dc converter is from solar pv while the output of the dc-dc converter is to load. The whole process control by the adjustment of duty ratio.so may i know how to determine the value of the component in dc-dc converter because the output to the load cannot be fixed if the input and duty ratio subject to change

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