Final Year Project Progress Presentation

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Final Year Project Progress Presentation

• Shane McMorrow

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Provisional System

• 72 cell solar panel (Isc 5.57A, Voc 50.9V, Pmax
  210W )
• Buck Converter with 7 ohm load (Provisional)

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Simulating Solar Panel

• In order to implement MPPT , the internal
  resistance of the solar panel had to calculated
• The internal resistance of a solar panel varies
  for different light levels and temperature
• An accurate simulation of a solar panel is needed
  to calculate its variable internal resistance

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Solar Panel Calculation Equations
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Plots
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Power Plots
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Variation of Internal Resistance
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Calculating Lmin/Lc
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Inductance Characteristics
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Variable Inductance for Solar Power Applications

• A SAG inductor should provide the best match the
  L-I characteristics for the varying power supply

http//www.nuigalway.ie/power_electronics/news/sag
_inductor.html
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Variable Inductance for Solar Power Applications

• Progress
• Research
• Buck Converters
• SAG inductor characteristics.
• Impedance matching using duty cycle for Buck
  Converters
• Simulations
• PV solar panel plots have been created using
  Matlab
• Pspice simulations of solar cells have been
  created
• Initial L-I characteristics have been created
  using Matlab

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Pspice Solar Cell simulation

• The student version of Pspice orCad only allows
  64 nodes, therefore a PV solar panel cant be
  simulated by connecting the cells in series
• Can still be used to simulate the Buck converter
  though

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To do

• Confirm initial figures calculated
• Use figures to design SAG inductor
• Design and build buck converter and test
• I have decided initially to use a toothpic
  microcontroller to implement MPPT
• Learn how to program the toothpic and implement a
  MPPT algorithm