Solar array design
This presentation is the property of its rightful owner.
Sponsored Links
1 / 22

Solar array design PowerPoint PPT Presentation


  • 83 Views
  • Uploaded on
  • Presentation posted in: General

Solar array design. Life in the Atacama Design Review December 19, 2003 J. Teza Carnegie Mellon University. Solar Panel - requirements. Provide energy through day of mission (full sun) plus charge battery for night operation Light weight Robust Low wind profile Easily removable

Download Presentation

Solar array design

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Solar array design

Solar array design

Life in the Atacama Design ReviewDecember 19, 2003

J. TezaCarnegie Mellon University

Carnegie Mellon


Solar panel requirements

Solar Panel - requirements

  • Provide energy through day of mission (full sun) plus charge battery for night operation

  • Light weight

  • Robust

  • Low wind profile

  • Easily removable

    • Transportation, safety, access

  • Minimum shadowing

Carnegie Mellon


Solar panel design

Solar Panel - design

  • Emcore ATJ cells

    • Efficiency > 23%

  • Panel area: less than 2.5 m2

  • Modular

    • Ease of assembly / disassembly

    • Simplify design and fabrication

    • Spares

  • Orientation

    • Fixed – simplicity, can’t demonstrate gain of pointed panel offsets complexity and losses of actuation

    • Horizontal – simplicity, symmetry, lower wind profile

  • Can this design provide sufficient power?

Carnegie Mellon


Simulation

Simulation

  • Schedule load over typical mission day

  • Simulate insolation for location and time

    • Matlab simulation of sun position, airmass attenuation, integrated over wavelength

    • Compared insolation against SBDART and Atacama 03 field data (error < 6% for insolation > 300 W/m2)

    • Model system energy

      • cell efficiency (empirical)

      • panel area

      • MPPT efficiency

Carnegie Mellon


Simulation activity schedule

Simulation – activity schedule

Carnegie Mellon


Simulation atacama 2 m 2 panel

Simulation – Atacama – 2 m2 panel

Date: 9/1/04

Date: 9/30/04

Insolation vs. time

Panel Power vs. time

Battery Energy vs. time

Carnegie Mellon


Simulation atacama 2 5 m 2 panel

Simulation – Atacama – 2.5 m2 panel

Date: 9/1/04

Date: 9/30/04

Insolation vs time

Panel Power vs time

Battery Energy vs time

Carnegie Mellon


Simulation atacama results

Simulation – Atacama - Results

Load energy / day : 2794 Wh

Carnegie Mellon


Solar panel configurations

Solar panel – configurations

Carnegie Mellon


Solar panel design strawman

Solar panel – design strawman

  • 6 modules

    • 160 cells / module

    • dimensions: 58 cm x 85 cm

    • 20 cells per string yielding 46 volts at MPP

    • 8 cells parallel yield 2.8 A Iscmax at 1000 W/m2

  • Panel

    • effective area 2.5 m2

    • geometric area 2.62 m2

  • Power from panel

    • 1000 W/m2 and 23.4% efficiency

    • 97.5 W / module

    • 585 W total

  • Weight estimate: 8 kg total

    • (including cell encapsulation, lamination and wiring)

  • Carnegie Mellon


    Solar panel issues

    Solar panel – issues

    • Schedule

      • design finalization

      • diode procurement

      • fabrication

    • Spares

    • Testing

      • Pittsburgh sun in spring insufficient

      • Arizona testing before shipment limited

    Carnegie Mellon


    Solar power trackers

    Solar – power trackers

    • Purpose

      • Electrically couple solar array to battery / DC bus

      • Operate at or near maximum power point of solar array

    • Vendors

      • Brusa / Solectria – analog, complex, geared for lead acid

      • AERL – buck converter with temperature dependent model of panel IV characteristic (not a true MPPT), simple

      • Biel – digital controlled, efficient, solar race technology

      • Others – typically not suitable for this application

        • Consumer; designed for lead acid (Morningstar)

          • Reliability, do not support Li technologies, not flexible

        • Industrial; designed for lead acid (Trace)

          • Over built - do not support Li technologies

    Carnegie Mellon


    Solar power point tracker biel mppt

    Solar power point tracker – Biel MPPT

    • Biel School of Engineering and Science (Switzerland)

    • NG Maximum Power Point Tracker

      • Boost converter

      • Tracks maximum power point

      • Power capacity 800 W

      • Can bus interface

    • Issues – reliability, support, programming

    • Cost $780

    Carnegie Mellon


    Action items

    Action items

    • Solar array

      • Finalize design

      • Procure bypass diodes

      • Fabrication detailing

    • Power tracker

      • Finalize solar panels and power system parameters

      • Procure

    Carnegie Mellon


    Solar power point tracker biel mppt1

    Solar power point tracker – Biel MPPT

    Carnegie Mellon


    Solar power point tracker biel mppt2

    Solar power point tracker – Biel MPPT

    Carnegie Mellon


    Insolation atacama 03 field data

    Insolation – Atacama 03 field data

    Carnegie Mellon


    Insolation atacama 03 field data1

    Insolation – Atacama 03 field data

    Carnegie Mellon


    Insolation atacama 03 field data2

    Insolation – Atacama 03 field data

    Carnegie Mellon


    Insolation atacama 03 field data summary

    Insolation – Atacama 03 field data - summary

    • Average available energy per day: 6335 Wh/m2/day

    • Std dev: 212 Wh/m2/day

    Carnegie Mellon


    Solar panel cell response

    Solar panel – cell response

    Carnegie Mellon


    Solar panel cells

    Solar panel – Cells

    • InGaP/GaAs/Ge cell with Si bypass diode

    • Cell dimensions: 4 cm x 6.9 cm (nominal)

    • Cell area, effective : 26.6 cm2

    • Cell area, geometric: 27.3 cm2

    Carnegie Mellon


  • Login