METHOD AND DEVICE FOR ESTIMATING POWER AND/OR CURRENT OF INVERTER
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United States of America Patent
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Jul 16, 2015
app pub date -
Dec 16, 2014
filing date -
Jan 16, 2014
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Abstract
An exemplary device and method for estimating an active and/or reactive component of output power of a three-level inverter having a DC link divided into two halves by a neutral point. The device having control unit for determining a voltage ripple at the neutral point, determining a magnitude of a third harmonic component of the voltage ripple in a rotating coordinate system that rotates synchronously with an output voltage of the inverter, and calculating a component of an output current or power in the rotating coordinate system on the basis of the magnitude of the third harmonic component.
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