Abstract
Voltage sag is one of the most serious dynamic power quality problems which influences normal and safe operation of many electric equipments. In order to measure characteristic parameters (magnitude, duration and phase-angle jump) of voltage sag accurately, a method of voltage sag detection based on dq transform and mathematical morphology filter is present. Firstly, a fictitious three-phase system is created from a reference single-phase voltage by a 60°delay. And then the abc three-phase voltages are transformed into the dq conversion of instantaneous voltages. The direct current components of dq instantaneous voltages are picked up by mathematical morphology filter. Subsequently the magnitude, duration and phase-angle jump of voltage sag are calculated. Compared with the conventional low pass filter and average voltage method, the simulation results verify that the mathematical morphology filter method has shorter response time and slightly higher detection accuracy.
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