TY - JOUR
T1 - Fast Fault Protection Based on Direction of Fault Current for the High-Surety Power-Supply System
AU - Li, Haijin
AU - Chen, Min
AU - Yang, Boping
AU - Blaabjerg, Frede
AU - Xu, Dehong
PY - 2019/6
Y1 - 2019/6
N2 - The high-surety power-supply system, super uninterruptable power supply (Super-UPS), is an evolution of the traditional uninterruptible power supply. It consists of multiple sources, multiple energy storages, and redundant power converters to improve the reliability of the power-supply system significantly. In this paper, a fast fault-protection scheme based on direction of fault current without the assistance of communication for Super-UPS is presented. It achieves fast and selective fault detection and ensures the uninterruptible load power when short-circuit faults occur. The directional fault-current detection and the coordination between the circuit breakers and converters are investigated. The protection threshold settings are also discussed. In addition, an improved fault-current measurement method, which can suppress the influence of stray inductance of the solid-state circuit breaker, is presented to guarantee an accurate operation of the protection scheme for rapidly rising fault current. Finally, the proposed protection scheme and the improved fault-current measurement method for Super-UPS are verified by experiments.
AB - The high-surety power-supply system, super uninterruptable power supply (Super-UPS), is an evolution of the traditional uninterruptible power supply. It consists of multiple sources, multiple energy storages, and redundant power converters to improve the reliability of the power-supply system significantly. In this paper, a fast fault-protection scheme based on direction of fault current without the assistance of communication for Super-UPS is presented. It achieves fast and selective fault detection and ensures the uninterruptible load power when short-circuit faults occur. The directional fault-current detection and the coordination between the circuit breakers and converters are investigated. The protection threshold settings are also discussed. In addition, an improved fault-current measurement method, which can suppress the influence of stray inductance of the solid-state circuit breaker, is presented to guarantee an accurate operation of the protection scheme for rapidly rising fault current. Finally, the proposed protection scheme and the improved fault-current measurement method for Super-UPS are verified by experiments.
KW - Directional protection
KW - high-surety power supply
KW - short-circuit fault protection
KW - solid-state circuit breaker (SSCB)
KW - uninterruptable power supply (UPS)
UR - http://www.scopus.com/inward/record.url?scp=85053630901&partnerID=8YFLogxK
U2 - 10.1109/TPEL.2018.2870982
DO - 10.1109/TPEL.2018.2870982
M3 - Journal article
AN - SCOPUS:85053630901
SN - 0885-8993
VL - 34
SP - 5787
EP - 5802
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 6
M1 - 8467349
ER -