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The massive integration of decentralized energy resources (DERs) poses a big challenge on the grid management. The resulting problems often require advanced power electronics based solutions like active filters or STATCOMs or even more futuristic system level solutions like smart transformers. The interaction of all the mentioned systems through grid connected converters originate stability problems. The identification of the system impedance or directly of the possible resonance and the consequent implementation of flexible and tunable damping solutions like notch filters, is discussed in this paper with reference to an already present measurement campaign. The results of an already developed 1 MVA power converter are shown. Meanwhile, a project is carrying to realize a multi megawatt medium voltage grid impedance analyzer. In this paper different scenarios are analyzed in simulation and experimentally.

Wide frequency range medium-voltage grid impedance analysis by current injection of a multi-MW power converter

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