This study presents a systematic approach to monitor sustained oscillations in real-time power systems. In general, monitoring of sustained oscillation means detection of oscillating frequency, its time range, type, and source of sustained oscillation. The basic steps adopted in paper include double-stage mode decomposition (DSMD), spectral and statistical analysis. The DSMD follows decomposition of signals by using improved complete ensemble empirical mode decomposition with adaptive noise followed by further decomposition by using variational mode decomposition to obtain rich dominant mode. It is shown that decomposed mode obtained by DSMD carries monotonic frequency component. The proposed approach is validated on simulated signals and real-time phasor measurement unit signals. The frequency and time duration of interarea and forced oscillations are distinctly detected. Also, the source of forced oscillations is identified in study. The proposed approach is more effective and accurate in wide-area monitoring than the other spectral-based methods for oscillation analysis in phasor measurement unit signals.
This paper is devoted to the study of intuitionistic fuzzy topological spaces. In this paper an intuitionistic fuzzy regular weakly generalized closed set and intuitionistic fuzzy regular weakly generalized open set are introduced. Some of its properties are studied. Also we have provided some applications of intuitionistic fuzzy weakly generalized closed set namely intuitionistic fuzzy rw T 1/2 space and intuitionistic fuzzy rwg T 1/2 space.
KeywordsIntuitionistic fuzzy topology, Intuitionistic fuzzy regular weakly generalized closed set, Intuitionistic fuzzy regular weakly generalized open set, Intuitionistic fuzzy rw T 1/2 space and Intuitionistic fuzzy rwg T 1/2 space.
Many analytical models have been developed for addressing the Vender selection for companies. There are a list of vendor for selecting materials. It is very difficult to select a genuine vendor. Since the selection of a vendor is influenced by several parameters which are in linguistic. Form also, therefore to quantity the linguistic variables fuzzy logic and set theory is used. The fuzzy set theory helps in vagueness of the system a fuzzy decision approach is developed where are resourcing of vendors to select suitable vendor for materials is made.
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