Fin inal Presentation: Fall 2016 Team 1716: Smart Ocean WEC Jeffrey Brennan, Christopher Stella, Peter McBride, Islam Bilalovski Faculty Advisor: Peng Zhang Graduate Advisor: Taofeek Orekan
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Introduction ● New form of renewable energy ● Sea waves have highest energy density (30 kW/m 2 ) compared to other renewable sources ● Abundant supply ● 70% of the world is ocean ● Major cities located near water ● Charge AUV’s Stationary view of point absorber
Working Principles ● Faraday’s Law ● Induced current from magnetic field [http://www.livescience.com/53509-faradays-law-induction.html] Cross sectional view of linear generator
Visual Representation
System Overview
Circuit Overview ● Original proposed circuit
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Previous Design ● Lack of control ● Small range of motion ● Rotor is rubber ● Rubber is an insulator ● Single phase Coil 3.0 on test rig
3-Phase Generation ● Linearizing a rotational generator ● Bnet = [1.5Bm(sin(wt))] - [1.5Bm(cos(wt))] ● Phase sequence as follows: a, b’, c, a’, b, c’ [1] [2]
3-Phase Generation: Rotor ● Three Phase Configuration ● Metal Core ● Vertically Aligned Coils
3-Phase Generation: General Formulae [3] [3]
3-Phase Generation: Power Formulae
3 Phase: Phase Voltage ● Expected Voltage Generation: ● Magnetic Field Intensity: 11380 (A/m) ● Flux Density: .0143 T ● Pull Force: 218.5 lb. ● Distance from magnets: 4 ”
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
3-Phase Rectifier • Full Bridge Rectifier • Converts generated AC to DC • Used to feed buck boost circuit
Power Electronics Reconfiguration ● Buck boost ● Reduce input voltage to usable levels ● Boost low voltages to 12V
Buck Boost: Design ● Continuous Conduction Mode (CCM) - current in the inductor never goes to zero between switching cycles R = 25 ohms L = 1.1 uH C = 0.667 uF
Buck Boost: MATLAB Simulation
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Added Control if (Vout >= 12.0) { error = ● Microcontroller Vout-12.0; ● Atmega 168PA-PU } else ● PI Controller { ● 12V reference for corrections error = 12.0-Vout; ● Bluetooth Receiver } ● ZS-040 printString(error);
Hazard Protection ● Severe Weather Setting ● Waterproofing [http://fineartamerica.com/featured/inner-glow-of-ocean-waves-anne-macdonald.html]
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Physical Testing ● Test Rig Rebuilt: 12/2/16 ● Results inconsistent with prior data
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Axial Diametric Custom Magnets ● 4” Diameter ● .5” Height [http://www.kjmagnetics.com/contest.asp] ● Diametric Poles ● 218.5 lb. Pull Force [https://www.kjmagnetics.com/proddetail.asp?prod=DZ08-N52]
New Batteries ● 14.8V – Li Ion ● 5.2 Ah ● .88 lbs. ● $74.99 [http://www.all-battery.com/Li-Ion18650148V5200mAhBatteryPackwithPCB.aspx]
Item Quantity Cost ($) Total ($) Budget PCB 3 50 150 Li Battery 2 75.00 150.00 Magnets 4 300.00 300.00 .67 uH 1 .40 .40 Capacitor 1.1 uH 1 1.10 1.10 Inductor 25 Ohm 1 .50 .50 Resistor Schottky 4 .40 1.60 Diode MOSFET 1 1.60 1.60 Rotor 1 200.00 200.00 Inherited X X X Total Cost $805.20
Outline ● Introduction ● Three Phase Power ● Power Electronics ● Added Control ● Physical Testing ● Materials/Budget ● Timeline
Timeline
Works Cited [1] Electric Machinery Fundamentals Fifth Edition [2] https://en.wikipedia.org/wiki/Linear_motor [3]http://ir.library.oregonstate.edu/xmlui/bitstream/handle/1957/5921/Novel+Control+of+a+Permanent+Magnet+Linear+Gener ator+for+Ocean+Wave+Energy+Applications.pdf;jsessionid=334C946642E6CD3DA1B41D55CE4691FE?sequence=1
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