Impedance Modeling for Three-Phase Inverters with Double Synchronous Reference Frame Current Controller in the Presence of Imbalance
Lucia Beloqui Larumbe (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Zian Qin (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Lu Wang (TU Delft - Electrical Engineering, Mathematics and Computer Science)
Pavol Bauer (TU Delft - Electrical Engineering, Mathematics and Computer Science)
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Abstract
This article presents a small-signal model for power-electronics converters that use a typical control structure in wind energy applications: the double synchronous reference frame current control. The article considers the presence of unbalanced currents and voltages, and analyzes their impact on the frequency couplings of the converter. In addition, it is revealed that, in the presence of negative-sequence voltage synchronization, the converter presents an additional coupling at -2f_1-f_p.