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Ground fault protection for DC bus using controlled power sequencing

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3 Author(s)
Cairoli, P. ; Electr. Eng., Univ. of South Carolina, Columbia, SC, USA ; Kondratiev, I. ; Dougal, R.

We present a new approach to protect a multi-branch medium-voltage DC bus from ground faults. Behavior analysis of a DC distribution scheme shows that it is possible to quickly de-energize the DC bus by controlling the main converter, open a contactor to remove the faulted line, then re-energize the system. This strategy reduces the out-of-service time and avoids the use of mechanical circuit breakers and their arc-eliminating equipments. The fast response time allows unfaulted loads to ride through the process with minimal local energy storage. Our research shows that it is possible to de-energize, reconfigure, and re-energize a typical industrial DC bus 10-20 times faster than methods traditionally applied in AC circuits, and that only 470 ¿Farad of bus capacitance is needed for unfaulted circuits to ride-through the process uninterrupted.

Published in:

IEEE SoutheastCon 2010 (SoutheastCon), Proceedings of the

Date of Conference:

18-21 March 2010