Mining for similarities in time series data using wavelet-based feature vectors and neural networks
Engineering Applications of Artificial Intelligence
Expert Systems with Applications: An International Journal
Classification of power system disturbances using support vector machines
Expert Systems with Applications: An International Journal
IEEE Transactions on Neural Networks
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This paper presents a time-time transform (TT-transform) variant for classification of non-stationary power signal disturbance patterns. The TT-transform variant is derived from the well known S-transform and employs a new window function whose width is inversely proportional to the frequency raised to a constant power with values within 0 and 1. Features are derived from the TT-transform result of the power signal patterns. These features are used for automatic recognition of types of disturbances with the help of kernel based support vector machine (SVM) based clustering. Further, the clustering performance of the TT-SVM based pattern recognizer is improved by a modified immune optimization algorithm. Several test cases are provided to demonstrate the improvement in classification accuracy while resulting in significant reduction of support vectors.