1 Department of Energy Technology, The Faculty of Engineering and Science, Aalborg University, VBN2 The Faculty of Engineering and Science (ENG), Aalborg University, VBN3 Electric Power Systems, The Faculty of Engineering and Science, Aalborg University, VBN4 Power Electronic Systems, The Faculty of Engineering and Science, Aalborg University, VBN5 Department of Electrical Engineering Shanghai Maritime University
Thanks to the fast responses of the inner voltage and current control loops, the dynamic behaviors of parallel voltage-controlled Distributed Generation (DG) inverters not only relies on the stability of load sharing among them, but subjects to the interactions between the voltage control loops of the inverters and the remaining system dynamics. This paper addresses the later interactions and the consequent resonances through the frequency-domain analysis of the inverters output impedances and the remaining equivalent network impedance. Furthermore, impacts of the virtual output impedance loop and the voltage feedforward loop in the current controller are evaluated based on such an impedance interactions analysis. Simulation results are presented to confirm the validity of the theoretical analysis.
Ieee Applied Power Electronics Conference and Exhibition (apec), 2013, p. 2977-2983
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I E E E Applied Power Electronics Conference and Exposition. Conference Proceedings
IEEE Applied Power Electronics Conference and Exposition, APEC 2013