Loss of Utility Detection and Seamless Operation of Distributed Generation System

In this article, a protection method for photovoltaic distributed generation (DG) system to fend off from islanding condition caused by the loss of the utility grid has been proposed along with a control scheme. The proposed islanding protection scheme is developed with a parametric time-frequency analysis technique for detection and an optimal probabilistic neural network for classification of events. Along with the islanding protection, a nested loop robust control scheme has been proposed for the seamless operation of the DG system during different uncertainty scenarios. The proposed system with islanding protection and robust control scheme has been implemented in MATLAB/SIMULINK environment. The practical feasibility of the proposed method is verified with an experimental setup and dSPACE control kit. For demonstrating the superiority of the proposed islanding protection method and robust control scheme for the DG system, a discussion of the results is presented.