Abstract
This paper presents demonstration of a protection scheme integrated into marine DC power distribution networks to investigate the coordination between each protection action. The integrated protection scheme is based on three different time-frame protection actions: fast action - bus separation by a solid-state bus-tie switch, medium action - feeder protection by high-speed fuses, and slow action - power supply protection by generator deexcitation. As the backup protection of the power supply protection, AC fuses are installed between generators and rectifiers. To coordinate each protection action, the influences of the inductance in the bus-tie switch and the DC-link capacitance are investigated by DC short-circuit tests with the different inductance and capacitance values. The protection scheme, coordinated by the above investigation, is verified by system-level short-circuit tests for bus and feeder faults. To validate the protection scheme for various fault conditions, low- and high-impedance fault currents are analytically calculated for the bus faults and simulated for the feeder faults. Time-current curve analyses show that the coordinated protection scheme can effectively protect marine two-bus DC power distribution networks with correct operations of the protection measures and enough time margins between the different actions.
Highlights
T HE marine sector has endeavoured to mitigate its impact on global warming, targeting to cut down energy consumption by 30% by 2025 from the level in 2004 [1]
Complete lab-scaled twobus DC power distribution networks (PDNs) are implemented with the integrated threelevel protection
This paper has presented coordination and verification of the protection scheme based on the three-level protection
Summary
T HE marine sector has endeavoured to mitigate its impact on global warming, targeting to cut down energy consumption by 30% by 2025 from the level in 2004 [1]. Slow action (the third level) - power supply protection by generator deexcitation, fold-back protection control, high-speed fuses, or SSCBs (up to several seconds). It should be mentioned that most of the works for marine LVDC PDNs have been conducted by industrial manufacturers They have published limited information on their solutions to protect their knowledge from being used by others, especially in the technical background of the system protection as it is one of the key technologies. Complete lab-scaled twobus DC PDNs are implemented with the integrated threelevel protection (fast action - bus separation by a SSBTS, medium action - feeder protection by high-speed fuses, slow action - power supply protection by generator deexcitation, and backup protection by AC fuses).
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