Abstract
Virtual synchronous generator (VSG) control has attracted significant research interest for its ability to provide inertial support for distributed generation (DG)-based microgrids. However, VSG control cannot ensure proportional reactive and harmonic power sharing among DG units when the line impedances are mismatched. To address this problem, an adaptive virtual impedance regulation (AVIR) strategy is proposed in this paper. In this method, a fixed virtual inductance is introduced to generate the reactive power reference, and then it is removed to recover output voltage. After that, the virtual inductance is regulated adaptively according to the error between instantaneous reactive power and its reference. When the AVIR process completes, equivalent impedance mismatches at fundamental and harmonic frequencies are reduced. The reactive and harmonic powers sharing accuracy can be improved with a relatively small virtual inductance, good voltage quality is maintained. The small-signal model of paralleled DG units is built for stability analysis, based on which, the key regulator parameters are selected. Simulation and experimental results are presented to verify the effectiveness of the proposed strategy.© 2017 Elsevier Inc. All rights reserved.
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