Abstract：Voltage sag problems affect the quality of power grid seriously, for solutions to these problems have not been able to take into account the timeliness and accuracy at the same time. This paper focuses on single-phase circuit instantaneous voltage dq0 detection changed method of voltage sags detection method based on the PSCAD, on this basis, transformed and delayed the coordinate by 60°, presents a new single-phase dq coordinate transformation assay. Finally, the advantages of method for the detection of three-phase power system simulation PSCAD single-phase fault this condition were analyzed, through comparing the Fast Fourier、single-phase dq coordinate transformation assay and the new single-phase dq coordinate transformation assay for detecting Voltage Sags. It provides a new way for voltage sags detection method.
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2016, Vol. 17 
