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In this paper. a novel fast short circuit current detection technique is proposed for PV inverter based DGs. The proposed short circuit current detector is based on the evaluation of the slope (d dt) and magnitude of the PV inverter current. As soon as it detects a fault that is likely to cause the PV inverter short circuit current to exceed the rated current of the inverter. it can do either of the following depending upon the grid code being followed by the utility: i) disconnect the PV inverter from the grid so that it does not cause any adverse short circuit current injection into the grid. or ii) autonomously transform the PV inverter into a dynamic reactive power compensator STATCOM (termed PV-STATCOM) to provide grid voltage support. In this paper this voltage support is demonstrated for stabilizing a critical induction motor load.
