Minute lecture - Optimisation of PV installations for partial shadowing
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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 Minute lecture - Optimisation of PV installations for partial shadowing Presentation Transcript

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