Islanding Detection Based on Rate of Change of Frequency over Active Power and PQ Load Insertion for Synchronous Distributed Generation

The interconnection of distributed generation (DG) into the utility network can create possible islanding formations. The islanding can give negative impacts on the utility personnel safety and the public. Therefore, an islanding detection technique is significantly important to detect islanding and disconnect the DG from the utility network as quickly as possible. Among the available islanding detection techniques, the hybrid technique of islanding detection was proposed in this study by combining two techniques: (1) the rate of change of frequency over active power (df/dP) and (2) PQ load insertion. A simulation study was also carried out on a distribution test system connected with a synchronous generator to evaluate the proposed technique using the PSCAD software. Then, various case studies were conducted, and the results validate that the proposed technique was able to detect islanding effectively and accurately.