Research on Islanding Operation Detection Method for Distributed Generation Based on Reactive Power Disturbance
Distributed power generations may experience faults leading to breaker tripping and a switch from grid-connected to island operation,losing frequency and voltage support from the large grid,which can endanger local equipment.While many algorithms exist for detecting island operation,the increasing number of grid-connected inverters and significant changes in electrical parameters at common coupling points reduce detection accuracy.This paper proposes a method that actively injects reactive power into the power outer loop of grid-connected in-verters,with the reactive power exhibiting regular fluctuations.If the distributed generation becomes islanded,changes in frequency and amplitude at the common coupling point will correspond to the injected reactive power,enabling rapid identification of the power operational state.Simulation results confirm that this algorithm offers high accuracy and fast detection speed.
island operationdistributed generationsreactive power disturbancefrequency offset
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