Abstract
AbstractPhotovoltaic (PV) power fluctuation, voltage unbalance, voltage harmonic distortion, and harmonic current sharing are primary concerns of power quality problems in PV based distributed generators (DGs) in an isolated microgrid system. For resolving these issues, this paper proposes a model predictive control (MPC) methodology for the battery management system (BMS) to smooth the PV power fluctuation, maintain the stable DC-link voltage, and manage the power balance within the microgrid. In addition to DG control, autonomous control strategy for parallel inverters is also developed to ensure the stable output AC voltage and proper load sharing. Specifically, prediction based voltage unbalance and harmonic compensation (VUHC) controller are proposed in the secondary level of hierarchical control to enhance the power quality in microgrids. The proposed compensation method reduces circulating currents among the parallel-connected inverters and provides quality power to loads. The effectiveness of this power control strategy is carried out by simulation under mismatched distribution feeder with nonlinear/unbalanced load conditions.KeywordsDistributed generatorEnergy storageMicrogridModel predictive controlPower quality and sharing
Published Version
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