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S-Transform Based Detection of Multiple and Multistage Power Quality Disturbances

Power quality (PQ) disturbance issues have been increased because of several power converters utilized in the interfacing of renewable energy sources with the grid. Meanwhile, these PQ disturbances needs to be detected with an effective signal processing technique. PQ disturbances such as harmonics which persist in the power system network mostly, when multiply with the single stage PQ disturbances results into multiple PQ disturbances. On the contrary, one PQ disturbance followed by another PQ disturbance before the restoration of former disturbance depicts the case of multistage PQ disturbance. Several versions of S-Transform have been presented in this paper to control the gaussian window width by optimal tuning of window parameters. This paper proposes standard S-Transform based analysis of multiple and multistage PQ disturbances. For the simulation purpose, the synthetic data of these disturbances are generated based on IEEE-1159 standard in MATLAB environment. Effective results have been attained using the proposed algorithm.