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POLAJŽER, B.
METHODS FOR VOLTAGE SAG SOURCE DETECTION
KOMUNALNA ENERGETIKA / POWER ENGINERING, 18
This paper describes and evaluates methods for voltage sag source detection. These methods are based on different criteria, i.e. disturbance energy, current change, and incremental impedance. Extensive simulation tests are performed, whereas the methods for voltage sag source detection are also tested through laboratory measurements, and field data. Based on the analysis of the obtained results, an evaluation of the discussed methods is performed. It is found that in the cases of symmetrical voltage sags, all methods give satisfactory results. However, in the cases of asymmetrical voltage sags, which are the most frequent ones, the effectiveness of almost all methods is insufficient. Furthermore, using positive-sequence components for voltages and currents, the effectiveness of all the discussed methods is considerably increased.
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