GRID-CONNECTED POWER CONVERSION CIRCUITRY AND POWER CONVERSION METHOD THEREOF
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United States of America Patent
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Issued Date -
Jan 19, 2012
app pub date -
Sep 9, 2010
filing date -
Jul 16, 2010
priority date (Note) -
Abandoned
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Abstract
A grid-connected power conversion circuitry and a power conversion method thereof are disclosed. A DC-DC converter converts a renewable energy into a stable and constant DC power. A DC-AC inverter inverts the DC power into an AC power. The duty cycle of the DC-DC converter is adjusted based on a feedback signal related to the DC power, thereby stabilizing the output of the DC-DC converter. The duty cycle of the DC-AC inverter is adjusted based on a feedback signal related to the AC power as well as the phase angle of grid power that is in turn detected by a phase angle processor. Consequently, the AC power can be synchronized with the grid power in frequency. Therefore, the grid system provides auxiliary power when the renewable energy is insufficient, and the AC power output by the DC-AC inverter is synchronized with the grid power in frequency.
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