Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
705608 | Electric Power Systems Research | 1960 | 9 Pages |
This paper presents a novel graphical approach to adjust and evaluate frequency-based relays employed in anti-islanding protection schemes of distributed synchronous generators, in order to meet the anti-islanding and abnormal frequency variation requirements, simultaneously. The proposed method defines a region in the power mismatch space, inside which the relay non-detection zone should be located, if the above-mentioned requirements must be met. Such region is called power imbalance application region. Results show that this method can help protection engineers to adjust frequency-based relays to improve the anti-islanding capability and to minimize false operation occurrences, keeping the abnormal frequency variation utility requirements satisfied. Moreover, the proposed method can be employed to coordinate different types of frequency-based relays, aiming at improving overall performance of the distributed generator frequency protection scheme.
• We present a new method to set anti-islanding relays of distributed generators. • Standard frequency and rate of change of frequency relays are employed. • Generator frequency-based protection performance is significantly improved. • Two different frequency-based relays can be efficiently coordinated. • Anti-islanding and abnormal frequency variation requirements can be met simultaneously.