Which risk increases when a photovoltaic array microinverter circuit output impedance poorly matches grid impedance?

💡 Explanation

Harmonic current injection increases due to impedance mismatches causing resonance forming harmonics in the circuit, which stresses the grid. This occurs because grid impedance interacts with the microinverter output impedance, therefore causing harmonic current distortion, rather than predictable voltage sags due to a short-circuit.

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