Apparatus and method for controlling overcurrent of grid-connected inverter due to abnormal grid voltage
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United States of America Patent
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Jul 18, 2017
Grant Date -
May 5, 2016
app pub date -
Jun 20, 2014
filing date -
Jun 26, 2013
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Abstract
An apparatus for controlling overcurrent of a grid-connected inverter due to an abnormal grid voltage includes a grid voltage sensor configured to sense a grid voltage according to an output current of the grid-connected inverter, a voltage variation calculator configured to calculate a D-axis voltage and a Q-axis voltage of the grid voltage to obtain variation values of the D-axis voltage and the Q-axis voltage, and an output current controller configured to determine whether at least one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds a set value of the grid voltage variation, and decrease the output current by a predetermined value when one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds the set value of the grid voltage variation.
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