PULSE WIDTH MODULATED CONTROL FOR HYBRID INVERTERS
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United States of America Patent
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Issued Date -
Aug 30, 2012
app pub date -
Sep 15, 2011
filing date -
Feb 28, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A single-phase hybrid multilevel inverter is described that combines a 3-level leg and a 2-level leg to reduce the number of overall switching devices for a 5-level inverter. The 2-level inverter leg switches at a fundamental frequency and the 3-level flying capacitor leg uses PWM modulation to switch resulting in a low THD output voltage spectrum. The control method developed for the single-phase inverter is used to build a three-phase inverter comprised of three single-phase hybrid inverters in order to achieve a line-to-neutral voltage having five levels and a line-to-line voltage having nine levels.
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