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Unintentional islanding protection of distributed generation is a key function for standards compliance. For those distributed generations that use an inverter as grid interface, the function can be implemented as part of the inverter control. Existing anti-islanding schemes used in inverters have power quality and non-detection zone issues. This paper proposes a new family of schemes that have negligible power quality degradation and no non-detection zone. Design guidelines based on frequency-domain analysis is also provided. Finally, both simulation and experimental results validate the proposed schemes. 1.0-7803-8399-0/04/$20.00 8 2 W IEEE.