Abstract
This paper includes the theoretical analysis and experimental validation of a control strategy for the direct power and current control of grid-connected inverters. The studied control strategy allows for constant active and reactive power delivery during unsymmetrical faults and with supply voltage distortion, without the use of a PLL or FLL. It has been proven that only positive sequence current harmonics are necessary to deliver constant P and Q during unbalanced grid faults. The resulting stationary frame control has been experimentally validated during unbalanced voltage sags and swells.
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