This paper presents a small-signal model for power electronics converters that use a typical control structure in wind energy applications: the double Synchronous Reference Frame (SRF) current control. The paper 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 -2f1-fp.
- Double Synchronous Reference frame
- smallsignal modelling
- impedance modelling
- frequency coupling
- phase locked loop (PLL)