Several different approaches for the detection of voltage dips in electic power systems have been proposed in the literature to overcome the limits of the procedure proposed by the International Standard, based on the voltage root mean square. In this paper the most promising of these approaches are compared, by computer simulations, in terms of both statistical performance and response time, which is a critical issue for the development of real-time compensation systems
An alternative detection algorithm, based on the Generalized Likelihood Ratio Test (GLRT), is proposed for the detection of voltage dips in power systems. The proposed method is compared to the classical approaches based on the voltage root mean square. It is shown, by computer simulations, that the GLRT may provide competitive performance, in terms of capability of correctly detecting the dip starting instant.
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