Control of Active and Reactive Power Ripple to Mitigate Unbalanced Grid Voltages


Managing power delivery from distributed generation systems is challenging when the grid voltages are unbalanced, since the negative sequence voltage causes power oscillations at twice the basic grid frequency. Current regulation using sequence parts will be used to manage these real and reactive power oscillations, and therefore facilitate mitigate the unbalanced network voltages. This paper presents a consolidated management scheme using double sequence frame current regulators which will readily change between eliminating real or reactive power oscillations created by unbalanced grid voltages, or alternatively can merely balance the three-phase currents. The mitigation influence of these alternative control strategies on unbalanced grid voltages is then experimentally examined for a distribution feeder with a resistive and/or reactive series impedance.

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