Wavelet-alienation coefficient based protection of distribution system

Growth enhances the complexity in control of distribution networks which are progressing towards the vision of smart grids. Inclusion of non-conventional resource power generators affects in magnitude and flow directions of faults in the distribution system there by posing challenges towards protection of distribution system.. A wavelet and alienation coefficients based algorithm described in this paper for electrical distribution network protection which is also connected with wind farm. The algorithm takes the current samples at selected nodes of the wind farm connected distribution system. From the collected samples of the current signals approximation coefficients are extracted using wavelet technique. A moving half cycle window is used to obtain alienation coefficients of the current signals which were approximated by wavelet technique. Using the WT (Wavelet transform) decomposition on the currents measured at selected nodes approximation coefficients are computed, which are used for acquiring the alienation coefficients to fault classification and identification. MATLAB Simulink is used for simulation of modified IEEE 13 bus test feeder system.Effectiveness of proposed technique examine for all possible shunt faults at every bus of test feeder system. Also the effect of wind speed variations and location of wind farm connection conditions are tested to evaluate the reliability of the technique.