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1KW Power Inverter 2005
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The Future Energy Challenge (FEC) 2005 invited undergraduate teams to design
and build a utility interactive inverter to compete against other teams from
around the world. This design report summarizes the University of Wisconsin FEC
(UWFEC) team’s efforts to achieve this goal. Different aspects of this project
allowed UWFEC members to improve valuable skills such as writing, presentation,
team work and lab skills through first hand experiences. The UWFEC team’s first
priority was a simple inverter design to focus on understanding and functionality.
Theoretical thermal analysis and computer simulations were used to verify the
design. Key features include small size, low cost, and convenience through
the use of surface mount devices, high frequency planar transformer and inductors,
single chip Programmable System on Chip (PSoC) and International Rectifier
Appliance Module (IRAM) devices.
The Project had the following requirements:
•The inverter must be efficient and comply with requirements for harmonic
control, interconnection, and safety standards.
•The inverter must be
capable to operate in typical voltage and frequencies, grid-connected or
stand-alone.
•Target hardware costs are US$200 for an inverter that can
operate from a dc input voltage varying from 30 volts to 60 volts, under
constrained input power varying from 250W to 1000W, to a single-phase utility
line 110/240V either 50Hz/60Hz, with efficiency of at least 90%.
Status
The project finished in the top 5 with special award:
+ Innovative Packaging - University of Wisconsin - Madison, USA (for $1,000)
The inverter in now being converted for use with the Corbin Sparrow project.
Technical Specifications
+ $120.75 production cost (100,000 unit volumes)
+ 30-60 vdc nominal input (solar, wind, fuel cell)
+ Grid intertied, IEEE 1547, IEEE 519 Compliant
or stand alone mode
+ 1kW @90% efficiency, 3kW peak power rating (for 20 cycles)
+ 110 V +15% -20%, @60 Hz ± 2%; 240 V +15% -20%,
@50 Hz ± 2%. If grid fails, disconnect and go to
250W emergency backup (120vac single phase)
+ 3kg mass, 7 liter volume (~7.5” cube)
+ Battery backup optional
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