Ultra fast pilot protection of a looped distribution system

The distribution system considered in this work is the FREEDM* loop. The loop is divided into different zones for protection. A fast pilot protection scheme is proposed for this looped system. The scheme makes time synchronized measurements of line currents, converts them to digital word. Time synchronization is added using a GPS. This time-synchronized digital word is transmitted to a computer, which executes a protection strategy for differential protection as primary and overcurrent protection as backup based on the requirements of the FREEDM system. A trip signal generated by this strategy is sent to the breaker to trip the line to complete the experimental setup. Since the protection algorithm is based on digital signals, this scheme is much faster than a conventional differential pilot protection algorithm.

[1]  S. Schaffer.  Specifying current limiting fuses to protect molded case circuit breakers , 1989, Conference Record of the IEEE Industry Applications Society Annual Meeting,.

[2]  Hong Ong,et al.  Communication performance over a gigabit Ethernet network , 2000, Conference Proceedings of the 2000 IEEE International Performance, Computing, and Communications Conference (Cat. No.00CH37086).

[3]  Gerald T. Heydt,et al.  Test bed evaluation of future power distribution systems with renewable resources , 2009, 41st North American Power Symposium.

[4]  Mladen A. Vouk,et al.  A performance evaluation of emerging Ethernet technologies: switched/high-speed/full-duplex Ethernet and Ethernet LAN emulation over ATM , 1996, Proceedings of SOUTHEASTCON '96.

[5]  C. Schwaegerl,et al.  Ancillary services for renewable integration , 2009, 2009 CIGRE/IEEE PES Joint Symposium Integration of Wide-Scale Renewable Resources Into the Power Delivery System.

[6]  Wael William Diab,et al.  Ethernet in the First Mile , 2005 .

[7]  Yueming Lu,et al.  An Enhanced IEEE 1588 Time Synchronization for Asymmetric Communication Link in Packet Transport Network , 2010, IEEE Communications Letters.

[8]  James S. Thorp,et al.  IEEE Standard for Synchrophasors for Power Systems , 1998 .

[9]  Chris Edrington,et al.  Development of solid-state fault isolation devices for future power electronics-based distribution systems , 2011, 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC).