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A STUDY OF COMPARATIVE FAULT ANALYSIS & FAULT TIME IN A UPFC INTEGRATED WIND FARM

This paper discusses the study of fault analysis and fault time in a Unified Power Flow Controller (UPFC) integrated wind farm. Here wind farm is included in UPFC compensated transmission line. The fault detection analysis & fault time is computed using the DWT (Discrete wavelet transform) approach. The importance of using the DWT approach is that it can detect the fault at any variation of the line parameter with less time and accurately. The fault time using this scheme remains within 20msec. Thus it is effective, economic as it involves less carrier communication link. The scheme works when the line is faulty and it extracts the phase current from the current transformer placed at both sending and receiving the end of the transmission line. The most versatile signal processing of DWT algorithm is used here to obtain the spectral energy (SE) of each phase at sending and receiving the end of the line. Then the differential spectral energy (DSE) is computed with the difference of SE evaluated at each end of the line. The DSE value of each phase is the major factor for deciding the existence of shunt fault pattern . The simulation result shows the performance of the scheme with varying wind speed. The simulation results are compared to the conventional scheme to justify the accuracy of the proposed scheme. Different parameter variations are considered such as repeated phase fault in case of double circuit line of circuit-1 & circuit-2, UPFC and wind speed variation, fault resistance of the line.