Detection Method of Power Quality Disturbances Using Incomplete S-transform
Tan Hui-sheng · Gao dianya jishu · 2009
The detection methods of power quality based on S-transform usually adopt the feature vectors of S-transform module time-frequency matrix instead of all of the vectors.Accordingly,the computational procedure was analyzed,and the incomplete S-transform was proposed.Firstly,the FFT was performed and dynamics was utilized to describe the envelope of power spectrum so as to detect the valid frequency samples of FFT.Then the incomplete transform was specifically performed for these samples and the modules were calculated so as to get the feature vectors.Finally,these feature vectors were used to detect the power quality disturbance.The simulation results illustrate that the proposed method quickens the detection and is more suited for real time application.