Fault Location Identification Using Hybrid Scheme in AC Microgrid

A protection methodology based on traveling wave using Discrete Wavelet Transform (DWT) in a multi-terminal radial microgrid (MG) network has been proposed in this paper. The proposed method utilizes a hybrid scheme, combination of super-imposed Root Mean Square (RMS) current method Discrete Wavelet Transform technique, to locate the fault in radial microgrid structure. This paper first uses superimposed current to detect and identify the fault section, then DWT to locate the fault, by capturing the traveling wave during fault. Further, the proposed scheme requires minimal number of Intelligent Electronic Devices (IEDs). This scheme is tested on IEEE 33 bus system in EMTDC/PSCAD for various test cases such as variations in fault resistance and inception angle for all types of faults in all different sections. Outcome of test results shows algorithm has less errors and the error values in fault location mainly depends on the DG location in the system