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This paper addresses harmonic magnification due to resonance circuitsresulting from interaction between uncertain grid impedance and converter. Thesource of harmonic may be either the grid or inverter. It is demonstrated thatunknown and unpredictable grid impedance may result in variable resonancefrequency, which challenges robust design of LCL filter of inverter.

Impact of Grid Impedance Variations on Harmonic Emission of Grid-Connected Inverters