senior design ii mid-semester presentation. single phase inverter team members team leader...
TRANSCRIPT
![Page 1: Senior Design II Mid-Semester Presentation. Single Phase Inverter Team Members Team Leader Electrical Engineer Control System Design Power Electronics](https://reader035.vdocuments.net/reader035/viewer/2022062301/5697bf9f1a28abf838c94a91/html5/thumbnails/1.jpg)
A COMPACT 400W SINGLE PHASE INVERTER
Senior Design II
Mid-Semester Presentation
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Single Phase Inverter Team Members
Team LeaderElectrical Engineer
• Control System Design• Power Electronics• Programming• Website
Electrical Engineer
• Output Filter Design• Hardware Implementation• Power Electronics
Electrical Engineer
• Output Filter Design• Programming• Enclosure• Website
Electrical Engineer
• Hardware Implementation• Enclosure• Control System Design
Christopher Burge
Michael Robertson
Johnny Reed
Bret Hariel
Faculty Advisor: Dr. Masoud Karimi
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Outline
Problem Solution Technical Constraints Practical Constraints System Overview Design Refinements Testing Plan Packaging Timeline Questions
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Example of an inverter used to connect a distributed resources to a load
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Problem
Adaptability of system components to change in distributed resource system parameters
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Solution
An inverter which is capable of accepting variable DC inputs
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Technical Constraints Name Description
Voltage Regulation
The voltage must stay within a 10% range centered on 120V.
Efficiency This device must have an efficiency greater than 95%
Total Harmonic Distortion
The THD must be less than 5%
Power Rating The device must be able to deliver 400W
Input Voltage Range
The device must be able to output a voltage of 120V with an input range from 200 to 300VDC
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Practical Constraints
Type Name Description
Environmental Enclosure The inverter enclosure must be weather proof from sun and rain.
Manufacturability Size The inverter must be compact and weight less than 25lbs.
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System Overview
DC Source
Output Filter Load
Voltage Sensor
Microcontroller
Power Electronic
Circuit
Control to Power Isolated
Interface
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Design Refinement
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Improvements
Voltage Sensing Circuit DC Source Replacement
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DC Source Replacement
Buck Converter VLA106-24151 DC/DC 24V to15V UA78L00 15V to 5V DC Regulator TLE2426 to obtain -15V DC
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Buck Converter Purpose:
To supply power to all the elements that are not in the power electronic circuit
Challenge:
How to supply power to the MOSFET of the buck converter on start up
Solution:
Put a passive component circuit in parallel with the buck converter to supply microcontroller power
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Schematic of Buck Converter
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Additional DC/DC Regulators
Purpose:
To supply all power from a single source
VLA106-24151 DC/DC 24V to15V UA78L00 15V to 5V DC Regulator TLE2426 to obtain -15V DC
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Voltage Sensor Circuit (old)
Problem
High power loss in the voltage divider and additional voltage buses
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Voltage Sensor Circuit (new)
Solution
A sensor network that requires less power and a less diversity of voltage buses
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Product Testing
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Power Quality, Voltage Regulation, and Efficiency
Power Quality:
The THD must be less than 5%
Voltage Regulation:
The device must be able to output a voltage of 120V with a no more than a 10% deviance regardless of the load within our operating range
Efficiency:
This device must have an efficiency greater than 95%
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Power Quality, Voltage Regulation, and Efficiency
Power Quality:
Using the Fluke 43B Power Quality Analyzer we will measure the total harmonic distortion
Voltage Regulation:
Using the Agilent DSOX302A4 Oscilloscope we will monitor the output voltage and compare it to a central tendency value of 120V
Efficiency:
Using the Fluke 43B Power Quality Analyzer we will measure the output power and compare it to the input power of the Sorensen XHR 600-1.7 DC source.
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Voltage Regulation Load Expected
Output VoltageExpected THD
R = 600 120.35V 1.24%
R = 200 120.33V 1.43%
R = 150 120.35V 1.01%
R = 100 120.55V 1.93%
R = 250 120.28V 0.87%
R = 100, L = 250µ 120.54V 1.94%
R = 100, L = 500µ 120.54V 1.94%
R = 100, L = 1m 120.73V 2.83%
R = 100, C = 5µ 120.37V 1.29%
R = 100, C = 10µ 120.40V 0.5%
R = 100, C = 20µ 120.50V 1.54%
R = 100, C = 10µ, L = 500µ 117.88V 0.7%
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Variable DC InputThe output voltage must stay within a 10% range centered on 120V.
Test Conditions:
Test 1: Vary the input power of the Sorensen XHR
600-1.7 DC source from 200V to 300V
Test 2: Vary the input power of the Sorensen XHR
600-1.7 DC source from 300V to 200V
Results: Output remains within voltage regulation
constraint
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Max Power Rating
The device must be able to deliver 400W
Test Conditions:
Three 100Ω power resistors placed in parallel to give a total of 33Ω to draw 400W to the load
Results: Pass Fail
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PCB&
Packaging
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PCB
PCB Design Software Options:Cadence OrcadEagle
PCB Design Choice: Eagle 5.11 Professional
Customizable libraries and ease of making parts
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PCB Schematic
Microcontroller
Interface Circuit
Power Electronic CircuitDC Source
Voltage Sensor
Load
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PCB Layout
6”
10”
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Enclosure Requirements
ManufacturabilityMust exceed 10”x 8”x 4”Must weigh less than 15lbs
EnvironmentalMust be NEMA 3R
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Enclosure Options
12”x 10”x 5” 13.45”x 11.83”x 6.31”
8.25lbs $180
6lbs$86 [1] [2]
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Timeline
January February March April
Voltage Feedback
Design Refinement
PCB Design
PCB Implementation
Enclosure
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References[1] L-com Global Connectivity. 12X10X Inch 120 VAC Vented Weatherproof Enclosure. Available: http://www.l-com.com/item.aspx?id=31421
[2] Automation Direct. Premier (6in. X 6in. to 16in. X 14in.). Available: http://www.automationdirect.com/adc/Shopping/Catalog/Enclosures/Non-Metal_%28NEMA_4X_-a-_3R%29/Premier_%286_in._X_6_in._to_16_in._X_14_in.%29
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A COMPACT 400W SINGLE PHASE INVERTER
Senior Design II
Mid-Semester Presentation
Questions?