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Abstract Large fault currents in a synchronous-based distributed generator (SBDG) can cause serious damage to the core and windings of the generator. This paper proposes an adaptive grounding scheme to limit the ground fault currents to a safe level. To do so, a high impedance grounding configuration is designed to operate during the grid-connected mode to minimize damage to the generator during ground faults. An electronic switching mechanism is provided to identify the islanded mode of operation. This switching operation strategy will modify the grounding system to the low-impedance configuration during the islanded-mode of operation of the SBDG to ensure the steadfast operation of the overcurrent protection (OCP) relays to prevent the nuisance tripping by the protective devices. Furthermore, the schematic diagram of the proposed grounding configuration has been presented and discussed to ensure the safe decay of the generator field current during ground faults in the genera ....
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