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Field programmable gate array hysteresis control of parallel connected inverters

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Author
Lund, John J.
Date
2006-06
Advisor
Ashton, Robert
Second Reader
Yun Xiaoping
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Abstract
This thesis presents the use of a Field Programmable Gate Array (FPGA) to control two Commercial-Off-The-Shelf (COTS) Power Electronic Building Blocks (PEBB) configured to produce a three-phase low distortion sine wave output. The next generation warship is expected to contain more electric loads that require quality variable frequency output. A typical propulsion motor in the 40MW range will probably require the current Total Harmonic Distortion to be less than 3% (MIL-STD-1399). However, high power low distortion inverters usually have associated high cost and weight penalties. This thesis presents a parallel hybrid converter which demonstrates the use of a high power low fidelity bulk inverter with a low power high fidelity active filter. The high power low fidelity output is sourced using a six-step inverter which produces the entire fundamental current. The low power hysteresis controlled active filter section produces only cancelling harmonic current. The paralleled result is a pristine output sine wave with a 1% current Total Harmonic Distortion (THD). This solution should offer the Navy a high fidelity high power inverter without the cost and weight penalties.
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http://hdl.handle.net/10945/2826
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