A set of formulas directly predict the performance of rate-of-change-of-frequcency (ROCOF) relays used to detect islanding of embedded synchronous generators. The formulas are analytically derived from the dynamic model of the generator and relay. Dynamic simulation results obtained using a representative distribution system confirm the validity and accuracy. The formulas presented are a useful tool for protection engineers; they can be used, for example, to assess the effectiveness of anti-islanding schemes based on ROCOF relays, or to assist the selection of relay settings, significantly reducing the number of repeated dynamic simulations necessary to carry out such studies.
Revised: November 2, 2006 |
Published: July 13, 2006
Citation
Vieira J.M., W. Freitas, Z. Huang, W. Xu, A. Morelato, and A. Morelato. 2006.Formulas for predicting the dynamic performance of ROCOF relays for embedded generation applications.IEE Proceedings. Generation, Transmission, and Distribution. 153, no. 4:399-406.PNNL-SA-52276.