Abstract
Due to the asymmetry of load, the ageing of transmission line, the asymmetry of power grid voltage and so on, grid-connected converter often appears grid voltage unbalance at the point of common coupling. Especially for some high-power grid-connected converter device, if the unbalanced conditions is ignored, it will produce non-characteristic harmonics, three-phase grid current unbalance and so on that will affect the stable operation of grid-connected converter, even ruin it. Therefore, it is necessary to study the control of grid-connected converter under unbalanced grid voltage. In view of the advantages of model predictive control in high-power converter, the control of grid-connected converter under unbalanced grid voltage based on finite control set model predictive control is studied. The goal is to control the three-phase grid current balance and enhance the stability operation of the grid-connected converter under unbalanced grid voltage. The grid-connected converter is modelled in two-phase stationary ( αβ ) coordinate system, and the model predictive control of grid-connected converter is deduced under unbalanced grid voltage. Based on the theoretical analysis, the simulation results show the effectiveness of the proposed control strategy.
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