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Low currents and voltage levels in a microgrid system make the fault detection by the conventional methods, very difficult. Due to ground faults voltage level drops to a very low level and thus, it becomes even more difficult to detect in case of a microgrid system. In this paper, a method of fault location identification and discrimination of fault type has been proposed. IEEE standard 14 bus microgrid system has been considered for this purpose. Faults are made to occur in two specific load buses and the outgoing currents of two generator buses were analysed in different conditions. S-Transformation is performed on the generator bus outgoing currents and kurtosis of the S-Transformation matrices has been calculated. An algorithm has been proposed for the detection of fault type and location. It has also been verified with different unknown cases. The simulation is carried out on the IEEE standard 14 bus system using MATLAB. The method presented here may be useful for the design of better protection schemes for such systems.

S-Transform Based Kurtosis Analysis for Detection of LG and LL Faults in 14 Bus Microgrid System