DC power systems have been investigated for transmission and distribution systems due to the advantages such as improved efficiency, reliability, and simpler configuration, as well as increasing DC-based distributed generation, energy storage, and loads. Along with comparatively short operating history and insufficient guidelines and standards, one of the current challenges is system protection techniques to deal with the highly dynamic and nonzero crossing nature of DC power. In this chapter, various coordinated protection schemes and applications for DC power systems have been reviewed in conjunction with the analysis of DC fault currents dynamics and topological bus configurations.

Chapter Contents:

• 4.1 Introduction
• 4.2 Faults in DC power systems
• 4.2.1 Fault types and behavior
• 4.2.2 Fault current analysis
• 4.2.3 Faults in various bus configurations
• 4.2.3.1 Point-to-point
• 4.2.3.2 Multiterminal
• 4.3 Coordinated protection techniques
• 4.3.1 AC side protection
• 4.3.1.1 Fault detection
• 4.3.1.2 Protection by AC circuit breakers
• 4.3.2 DC side protection
• 4.3.2.1 Fault detection
• 4.3.2.2 Postfault processes
• 4.3.3 Applications
• 4.3.3.1 High-voltage DC transmission
• 4.3.3.2 Shipboard power system
• 4.3.3.3 Traction power systems
• 4.3.3.4 Photovoltaic park
• 4.3.3.5 Data centers
• 4.3.3.6 Aircraft power systems
• 4.4 Summary
• Acknowledgment
• References

Inspec keywords: power system faults; power system protection; DC power transmission; distributed power generation

Other keywords: transmission systems; coordinated protection schemes; distribution systems; loads; DC power systems; system protection; topological bus configurations; reliability; energy storage; DC-based distributed generation; DC fault currents dynamics; DC microgrids; efficiency

Subjects: Power system protection; Power systems; d.c. transmission; Distributed power generation