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Maximum Power Point Tracking System for Solar Racing Team

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... Design Tests for Prototype April 15, 2011 PCB Re-Design April 20, 2011 Final Build April 22, 2011 Final Design Tests April 25, ... – PowerPoint PPT presentation

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Title: Maximum Power Point Tracking System for Solar Racing Team


1
Maximum Power Point Tracking System for Solar
Racing Team
  • Andrew Matteson
  • Ingrid Rodriguez
  • Travis Seagert
  • Giancarlo Valentin

March 14, 2011
GT Solar Jackets
School of Electrical and Computer Engineering
Georgia Institute of Technology
2
Project Overview
  • Customized smart switching power system to charge
    car batteries with solar energy
  • Intended for use by the Solar Jackets in the
    World Solar Challenge 2011
  • Estimated material cost 194 per unit

3
Prior Work Fall 2010
  • Initial design adaptable to varying sunlight
    variations
  • Designed for different battery and array
    specifications
  • Contained one power switching circuit per board

4
Design Objectives Spring 2011
  • Minimized PCB layout area
  • Efficiency gt 90
  • Implement RS-485 communication interface
  • Comply with solar challenge regulations

5
Design Overview
6
Maximum Power Extraction
Maximum Power Point P IV
Solar Cell I-V Characteristic
7
Smart Power Switching Circuit
8
PO Tradeoffs
  • Advantages
  • Simple to implement
  • Popular algorithm open-source code available
  • Highly adaptive
  • Disadvantages
  • Inevitable oscillation around the maximum power
    point
  • May interpret local maximum as the absolute
    maximum

9
RS-485 Protocol Implementation
  • This standard defines a physical layer
  • The protocol will be defined by the team
  • This standard will be responsible for
    communication between other electrical systems in
    the car

10
Operational Safety Precautions
  • Gradual shutdown by intentionally deviating from
    maximum power point
  • Maximum voltage
  • Input 18V
  • Output 105V
  • Maximum current
  • Input 8.5A
  • Output 3.5A

11
Safety Precautions Fuses and Connectors
  • Over-current/voltage protection
  • Automotive fuse at input
  • Cylindrical fuse at output
  • Touch-safe connectors

Courtesy of Fall 2010 Solar Power Array
Management Group.
12
Safety Precautions Zener Diodes
The Zener diodes provide paths for current to
flow in the event of an abrupt
disconnection.
13
Efficiency Synchronous Rectifier
  • Circuit efficiency can be improved by replacing
    standard components with more efficient
    alternatives
  • The standard diode can be replaced by a
    synchronous rectifier
  • The current design will accommodate both
    alternatives in the following way

Losses I2RDS(ON) Losses VFI
14
Design Challenges and Tradeoffs Georgia Tech PCB
Machine
  • Dimensions (10.5 in x 7.5 in )
  • This constraint dictates how many MPPT circuits
    can fit onto a single board (currently two)
  • Using a different machine would introduce
    significant additional costs.

15
Design Challenges and Tradeoffs Bounding
Simulation Parameters
  • Exhaustive circuit simulations cannot be
    performed for the full range of variable
    parameters
  • As a result, the circuits values are only
    approximations of the ideal optimal components

16
Product Delivery
  • Scheduled delivery for Monday April 25, 2011
  • Fully tested reproducible boards
  • Preprogrammed with microcontroller code
  • Include mechanical switches for easy control

17
Future Work Schedule
  • March 18, 2011 First Prototype
  • April 01, 2011 Design Tests for Prototype
  • April 15, 2011 PCB Re-Design
  • April 20, 2011 Final Build
  • April 22, 2011 Final Design Tests
  • April 25, 2011 Deliver Completed Board

18
RS-485 Demonstration
19
Questions
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