Biwt blade induction wind turbine
This presentation is the property of its rightful owner.
Sponsored Links
1 / 42

BIWT :: Blade Induction Wind Turbine PowerPoint PPT Presentation


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

BIWT :: Blade Induction Wind Turbine. Team 25 (Steven Pitula , Scott Chen, Sangmin No). Presentation Outline. Introduction Features / Benefits System Overview Individual Part Description with Testing Verification Physical Turbine & Power Conversion System Battery Charging System

Download Presentation

BIWT :: Blade Induction Wind Turbine

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


Biwt blade induction wind turbine

BIWT :: Blade Induction Wind Turbine

Team 25 (Steven Pitula, Scott Chen, Sangmin No)


Presentation outline

Presentation Outline

  • Introduction

  • Features / Benefits

  • System Overview

  • Individual Part Description with Testing Verification

    • Physical Turbine & Power Conversion System

    • Battery Charging System

    • Tachometer & Braking System

  • Limitations / Improvements

  • Ethical Consideration

  • Q&A


Introduction

Introduction

  • BIWT provides eco-friend and efficient solution for current wind turbine manufacturer

  • The main goal of BIWT is to increase total power produced by wind turbines through the use of electromagnetic induction in the bladesand smart controlling system.


Features benefits

Features & Benefits

  • Features

    • Generating extra power in terms of electromagnetic induction

    • Power conversion

    • Smart Operation monitoring and controlling (rpm, power output, charging)

  • Benefits

    • Clean and renewable energy source

    • Value for money through efficient power generation

    • May be implementable on current wind turbines


System overview block diagram

System Overview – Block Diagram


System overview components

System Overview – Components

  • Physical Turbine & Power Conversion System

    • Induction blades, DC generator

    • Rectifier, Boost Converter

  • Battery Charging System

    • Charge controller

    • 6V/12V lead-acid battery for storage

  • Tachometer & Braking System

    • PIC16F877A

    • Tachometer


The turbine

The Turbine

  • Wood

  • PVC

  • Aluminum


Induction system

Induction System

Solenoid length = 4 inches

Magnet path = 12 inches

The solenoids are connected in

series and are positioned at the

ends of the blades


Solenoid testing

Solenoid Testing

  • 3Vpp up to 10 RPM

  • 3.5 Vpp from 10 to 30 RPM

  • Magnets do not move

  • above 30 RPM


Rectifier and filter

Rectifier and Filter

The full-wave rectifier is made

of 4 schottky diodes and the

filter is a 1mF capacitor


Rectifier filter testing

Rectifier/Filter Testing

Input = 3 Vpp20Hz

Output = 1.15 V 40Hz

Vdrop = 0.35V

Vripple = 4.9%


Boost converter

Boost Converter

  • 200uH inductor

  • 1mF capacitor

  • Schottky Diode

  • Transistor


555 timer

555 Timer


Boost converter testing

Boost Converter Testing

Efficiency: 15%


Efficiency losses

Efficiency Losses

Pac = Pbc * Erec * Eboost

Erec = 71%

Eboost = 15%

Etotal = 10.5%


Induction vs generator power

Induction vs. Generator Power


Battery charging system overview

Battery Charging System - Overview

  • Store the power output from wind turbine

  • Charge controller to choose right storage according to power output from the turbine

  • Charging controller to maximize charging efficiency and protect the battery and circuit

  • 3 charging methods

    • Below 13.5V : Charge 6V lead-acid battery

    • From 13.5V to 15.1V : Charge 12V lead-acid battery

    • Over 15.1V : Go to dummy load


Battery charging system storage

Battery Charging System – Storage

  • Battery Selection

    • 6V lead-acid battery from Power-Series : 7.0Ah

    • 12V lead-acid battery from Power-Series : 8.0Ah

  • Required Charging Current Calculation

    • 6V lead-acid battery

      : 7.0Ah / 10Hr battery charging time = 0.7 A required

      : 8.0Ah / 10Hr battery charging time = 0.8 A required


Battery charging system 1 st design

Battery Charging System – 1st Design

  • 1st Design

    • Charge 12V lead-acid battery

    • Use LM 317 voltage regulator

    • Assume rectified DC Voltage Input to the regulator

  • Reasons for Design Failure

    • Lower power output than we expected

      • Minimum 18V required for LM 317

      • Need to modify the circuit for charging 6V battery

    • Varying DC power output from wind turbine

      • Potentiometer


Battery charging system 1 st design schematics

Battery Charging System – 1st Design Schematics


Battery charging system 2 nd design

Battery Charging System – 2nd Design

  • 2nd Design

    • Multiple charging options

    • Use LTC 1042 monolithic CMOS window comparator

    • Assume rectified DC Voltage from the DC generator

  • Reason of Design Failure

    • Sudden change of turbine motor

      • Results change in power output

    • Testing


Battery charging system 2 nd design schematics

Battery Charging System – 2nd Design Schematics


Tachometer

Tachometer

  • Built in contactless tachometer

  • RPM = revolutions per minute

  • Design requirements:

    • 5% margin of error vslaser tachometer reading

    • LCD display

    • Controls braking system

  • Additional features:

    • Average RPM with user reset


Original schematic

Reference1

Original Schematic


Early design approach

Early Design Approach

  • RPM =

  • Reduce variables

  • Circuit Requirements

    • Accurate time detection

    • Accurate revolution detection

    • Large number division

  • TTL?

  • Solution = embedded systems  microcontroller


Pic16f877a

PIC16F877A

  • 8 bit , 256 bytes EEPROM peripheral interface controller

  • MPLAB IDE / CCS compiler

  • Up to 20 MHz external CLK

  • Useful functions

    • CCP (capture and compare)

    • 3 timers (scalable)

    • Interrupt friendly


Timer1

Timer1

  • 16 bit register

  • Time = (# of counts)x(frequency of counts)

  • Time = 2^16 x increment frequency

  • setup_timer_1(T1_EXTERNAL | T1_DIV_BY_8);

    • Timer 1 increment frequency = 500 khz

  • Overflow

    • #int_timer1 : of_count = of_count + 1;

    • Extend timer1 by 16 bits

    • Total Time = [2^16x (overflow count) + (Timer1 count )] x increment freq

    • Time for overflow ~ .131 seconds


Ccp1 and rpm equations

CCP1 and RPM equations

  • Capture Timer 1 on interrupt from pin17

    • current_ccp = CCP_1;

    • setup_ccp1(CCP_CAPTURE_RE); // rising edge triggered

  • Allows us to measure time between interrupts

  • Sets sensor requirement: 1 low to high transition per revolution

  • RPM = 1/[(2^16 x overflow count + captured timer1 count)/60]

  • AVGRPM = (((x*AVGRPM) +RPM)/(x+1));

    x = x+1;

  • User push button  interrupt  reset x

  • CCP guide *(reference 3)


Lcd 16x2

LCD 16x2

  • LCM –SO SO1602D SR/A LUMEX (testing LCD)

  • HD 44780 controller LCD front panel

  • Parallel: 4 data inputs / 2 control lines from pic

  • Modified Flex_LCD driver *(reference 2)

  • 500 ms delay

  • Example print format:

    printf(lcd_putc,"\fRPM: %f\n",RPM);

    printf(lcd_putc,"AVG: %f\n",AVGRPM);


Braking system

Braking System

  • Old braking system: mechanical friction based

  • Maximum RPM set in code

  • When tachometer calculates RPM >= Maximum RPM:

    • Power mosfet IRL 520 is turned on, LED lights up

    • Generator terminals shorted

    • RPM decreases, held in brake mode for 3 seconds

    • RPM is cleared, brake is removed

    • Recheck RPM

    • Reapply brake or do nothing


Tachometer schematic

Tachometer Schematic


Tachometer fabrication and testing

Tachometer Fabrication and Testing

  • Modular approach

    • LCD constant  LCD variable  CCP  Timer1 

      RPM (fxn generator)  AVG RPM (fxn generator)  sensor 

      RPM and AVG RPM (sensor) = Final Product

  • LCD output test variables vs assembly debug

  • Over 11 code versions / 35 word pages of debugging procedures

  • Debugging procedure and documentation:

    • Problem/Symptom? Identify associated variables

    • Output to LCD + check

    • Solution? Modify code / recheck


Sensor design and testing

Sensor Design and Testing

  • Old design: reed relays

  • New design: optical sensor

  • TX / RX pair RX high impedance 1.5 M Ω

  • From testing: no voltage change (reflective tape)

    point TX directly at RX .04v voltage change

  • Use 110 lab optical sensor: OPB607a

  • Measurements 2mm away

  • Vambient: 4.63v Vblacktape: 4.81v Vreflectivetape: .84

  • PIC: detects high / low / high transition without debouncing


Key breakthroughs debugging

Key Breakthroughs Debugging

  • LCD variable output: simple counter with 2 variables

  • Symptom: counter would stop or reset, shifting breadboard

  • Possible causes: loose pin connections, bad hardware, bad code


Additional breakthrough debugging

Additional Breakthrough Debugging

  • AVG RPM function (with fxn generator)

  • AVG RPM = # of revolutions / [total elapsed time / 60s]

  • Symptom: AVG RPM not displaying correct value

    - display interrupt count (# of revolutions) and time count increments

    - set fxn generator to 1 hz (frequency of interrupt)

    - interrupt count fine , timer count is incrementing too slowly

    - possible cause : total time elapsed counter or algorithm issue

    - check code  problem: every CCP interrupt resets timer1, total time is innacurate

  • Solution: AVGRPM = (((x*AVGRPM) +RPM)/(x+1));

    x = x+1;

  • X will be reset by user push button


Testing and results

Testing and Results

  • Finished RPM detection Circuit (fxn generator input)

  • RPM = Frequency x 60


Testing and results1

Testing and Results

  • Final product testing:


Braking system test

Braking System Test

  • Maximum RPM set in code

  • Demo : 3000 rpm

  • Test: Max RPM set to 100

    • Source drain impedance switch off (20.18 Ω)

    • Source drain impedance switch on (.17 Ω)

    • Drive voltage increased till >100 RPM, LCD display 98 RPM

    • Brake applied for 3 seconds, RPM drop to 31, led on

    • Brake disengaged and re-engaged when drive voltage held constant


Limitations and improvements

Limitations and improvements

  • Generator

  • Coupling System

  • Solenoid System

  • Power Conversion

  • Charging Circuit


References

References

  • 1) http://electroschematics.com/451/digital-bike-tachometer/

  • 2) http://www.ccsinfo.com/forum/viewtopic.php?t=30964

  • 3) http://www.ccsinfo.com/forum/viewtopic.php?t=29963&highlight=ccp


Biwt blade induction wind turbine

Q&A


Biwt blade induction wind turbine

THE END

Thank You


  • Login