Implementing the virtual output impedance concept in a three phase system utilising cascaded PI controllers in the dq rotating reference frame for microgrid inverter control

摘要

This paper extends research on single phase microgrids [1] to implement a Virtual Output Impedance (VOI) in a three phase system utilising cascaded PI voltage and current control in the Rotating Reference Frame (RRF). The paper proposes two methods for the selection of VOI values; a selection surface and a summation approach. SABER simulations and dSPACE hardware results are provided for a two inverter microgrid to validate the control scheme and selection techniques.