A new adaptive wide area protection algorithm for distribution networks with distributed generation

This paper presents a new adaptive wide area protection (WAP) system consisting of a communication based algorithm that can detect the fault on any of the buses or feeders connecting the buses. This scheme utilizes an adaptive topology based on discrete wavelet transform (DWT) for all currents passing through the interconnected system. The algorithm utilizes the spectral energy of detail 3 coefficients in order to locate the fault and hence issue a trip decision for the faulted part. The system under study is a 9 bus interconnected distribution power system with two integrated distributed generators (DGs) that are wind farms located at two different buses in the system. The proposed protection scheme is used to avoid the impacts of integrating DGs into distribution power systems on the traditional protection schemes used for interconnected systems. The wind farms are accurately simulated using PSCAD software in which all the interconnected system is simulated. The proposed protection algorithm is modelled using MATLAB