Islanding detection criticality identification and control of coupled power system networks using nonlinear measures

Abstract

newlineDistributed Generation (DG), though offers many advantages in making modern power newlinesystems smart ones, unveils many technical problems in terms of its control and operation. newlineIslanding is one such problem which represents the loss of grid condition during which DG newlinecontinues to feed the load. In order to overcome the limitations of conventional islanding newlinedetection techniques, two novel passive methods based on Empirical Mode Decomposition newline(EMD) and Permutation Entropy (PE) of the signals at Point of Common Coupling (PCC) newlineare developed for the fast and efficient detection of islanding. The effectiveness of both the newlinemethods are tested in different power system models developed in MATLAB®/ newlineSimulink® and validated in IEEE bus systems. Simulation results demonstrate the newlineefficiency of the methods in differential identification of islanding from the non-islanding newlineones with very near zero Non-Detection Zone (NDZ) and no effect on power quality.A new Vulnerability Prediction Index (VPI) developed from the defining equations for real newlineand reactive power flows in AC networks for the prediction of instability aroused as a newlinepossible outcome of islanding in distribution network is proposed. Analysis of typical newlinenetwork configurations like three node and IEEE 14-bus test system using VPI newlinedemonstrates the fast and easy determination of criticality of network operation. The newlinedetermined critical components have to be isolated through controlled islanding for newlineavoiding cascade failures. A unified control strategy in the form of environmental coupling newlinewhich is based on dynamics of swing angles of different areas of networks is proposed for newlineperforming controlled islanding and resynchronization through the process of newlineantisynchronization and synchronization of the network components. newline