Optimisation of PV installations for partial shadowing Micro-inverters and decentralised DC-DC optimisation boxes Leonardo...
Problems with a conventional configuration  <ul><li>PV panels are connected in a string to a central inverter </li></ul><u...
Problems with a conventional configuration  Partial shadowing of panel 4 causes a production loss in all panels of the str...
Two possible solutions <ul><li>Decentralised micro-inverters </li></ul><ul><li>or </li></ul><ul><li>Decentralised DC-DC op...
1. Micro-inverters (1) <ul><li>No central inverter, but a micro-inverter for each PV panel </li></ul><ul><li>Micro-inverte...
1. Micro-inverters (2) Each PV panel has its own inverter (fitted at the back of the panels) The output of each PV panel c...
2.  DC-DC optimisation boxes <ul><li>Each PV panel has its own optimisation box </li></ul><ul><li>The boxes maximise the e...
Benefits of the two systems <ul><li>The output of each panel is optimised individually </li></ul><ul><li>Shadowing on one ...
Disadvantages of the two systems <ul><li>The cost is higher than in a conventional system with one central inverter </li><...
Micro-inverters versus DC-DC optimisation boxes <ul><li>Micro-inverters </li></ul><ul><li>Output 230 VAC </li></ul><ul><li...
A  few links <ul><li>Enphase website:  www.enphaseenergy.com </li></ul><ul><li>Enphase training video:  video </li></ul><u...
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Minute lecture - Optimisation of PV installations for partial shadowing

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Minute lecture - Optimisation of PV installations for partial shadowing

  1. 1. Optimisation of PV installations for partial shadowing Micro-inverters and decentralised DC-DC optimisation boxes Leonardo ENERGY www.leonardo-energy.org Guy Kasier E&D Systems January 2011
  2. 2. Problems with a conventional configuration <ul><li>PV panels are connected in a string to a central inverter </li></ul><ul><li>When there is shadowing on one panel (e.g. from a chimney or tree) the production of the entire string falls </li></ul><ul><li>The generating capacity is not fully utilised </li></ul>Leonardo ENERGY www.leonardo-energy.org
  3. 3. Problems with a conventional configuration Partial shadowing of panel 4 causes a production loss in all panels of the string Leonardo ENERGY www.leonardo-energy.org
  4. 4. Two possible solutions <ul><li>Decentralised micro-inverters </li></ul><ul><li>or </li></ul><ul><li>Decentralised DC-DC optimisation boxes </li></ul>Leonardo ENERGY www.leonardo-energy.org
  5. 5. 1. Micro-inverters (1) <ul><li>No central inverter, but a micro-inverter for each PV panel </li></ul><ul><li>Micro-inverters convert the DC from a PV panel into 230 VAC </li></ul><ul><li>The outputs are connected together in parallel and fed to the distribution board via a cable </li></ul>Leonardo ENERGY www.leonardo-energy.org
  6. 6. 1. Micro-inverters (2) Each PV panel has its own inverter (fitted at the back of the panels) The output of each PV panel can be monitored via a website Leonardo ENERGY www.leonardo-energy.org
  7. 7. 2. DC-DC optimisation boxes <ul><li>Each PV panel has its own optimisation box </li></ul><ul><li>The boxes maximise the energy output for each PV panel and ensure a fixed DC string voltage </li></ul><ul><li>The boxes are connected together in series, and to a central inverter </li></ul><ul><li>The output of each PV panel can be monitored via a web page or smartphone </li></ul>Leonardo ENERGY www.leonardo-energy.org
  8. 8. Benefits of the two systems <ul><li>The output of each panel is optimised individually </li></ul><ul><li>Shadowing on one or more panels has no effect on the generation of the other panels </li></ul><ul><li>Total generation can thus rise by 5% to 25% </li></ul><ul><li>Generation can be monitored from a web page. A poorly operating panel, inverter or optimisation box can thus be detected quickly </li></ul><ul><li>Inverters and optimisation boxes can be replaced individually in the event of any faults. </li></ul>Leonardo ENERGY www.leonardo-energy.org
  9. 9. Disadvantages of the two systems <ul><li>The cost is higher than in a conventional system with one central inverter </li></ul><ul><li>The total installation time is somewhat longer </li></ul><ul><li>In the event of a fault in a micro-inverter or DC-DC optimisation box, the roof has to be accessed for maintenance </li></ul>Leonardo ENERGY www.leonardo-energy.org
  10. 10. Micro-inverters versus DC-DC optimisation boxes <ul><li>Micro-inverters </li></ul><ul><li>Output 230 VAC </li></ul><ul><li>No central inverter required </li></ul><ul><li>Parallel connection </li></ul><ul><li>Monitoring via web page </li></ul><ul><li>DC-DC optimisation boxes </li></ul><ul><li>Output DC voltage </li></ul><ul><li>Central inverter required </li></ul><ul><li>Serial connection </li></ul><ul><li>Monitoring via web page and smartphone </li></ul>Both systems ensure a higher output in the event of partial shadowing of the PV panels. Leonardo ENERGY www.leonardo-energy.org
  11. 11. A few links <ul><li>Enphase website: www.enphaseenergy.com </li></ul><ul><li>Enphase training video: video </li></ul><ul><li>Solaredge website: www.solaredge.com </li></ul><ul><li>Solaredge training video: video page </li></ul><ul><li>Pros and cons of solar panel micro-inverters: video </li></ul>Leonardo ENERGY www.leonardo-energy.org

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