ALGORITHM FOR PROTECTION OF DISTRIBUTION SYSTEM WITH DISTRIBUTED GENERATION

Abstract

The injection from small or medium sized distributed generation units introduces various technical issues for the control and protection of the system, when operated in parallel with grid supply. Amongst these need is there to protect the system from islanding, caused by the loss of the utility grid supply. Failure to trip islanded generator can lead to problems such as out of phase reclosing, threats to personnel safety, damage of network instruments and degradation of power quality. In this work a new scheme for islanding detection of distribution network with Distributed Generation (DC) is proposed, using a Support Vector Machine (SVM) classifier. After generating test data (Voltage and Current) using PSCAD/ EMTDC simulation package, a decision of islanding or non islanding condition is carried out using SVM classifier. The proposed scheme is tested on islanding and various non islanding conditions like faults on the adjacent feeder, sudden change of load, capacitor switching, normal condition etc. and is capable to provide effective discrimination between islanding situation and non-islanding conditions by giving accuracy of the order of 99.52%.