Summary
Currently, the high-voltage multi-terminal DC (MTDC) grids face two major challenges. First, fast rise rate and lack of zero-crossing point in DC-side fault currents render AC circuit breakers inoperable. Second, DC line currents are passively determined by terminal DC voltages and line resistances, which inherently limits the capability of changing individual line currents for essential grid services such as power flow management and overloading prevention. To address these two limitations, DC circuit breakers (DCCBs) and DC power flow controllers (DCPFCs) have been developed. The conventional DCCBs are two-port devices installed in series with
Read more Read lessDC lines at their terminals in an MTDC converter substation, so that any fault current flowing through the line can be rapidly cleared. Additionally, a DCPFC can be installed at line terminals to adjust terminal voltages and power exchanges among adjacent lines. As a result, for a substation that connects to multiple lines, it needs to host multiple DCCBs and a DCPFC, which significantly increases the cost and footprint of both the substation and the MTDC grid. To this end, this work proposes an integrated equipment combining multiple DCCBs and a DCPFC, called the interline multiport DCCB with DCPFC, which can reduce the number of components and enhance the economic feasibility of MTDC networks. This paper presents the topology, operation principles, and component selection procedures of the proposed equipment, and compares it with the state-of-the-art technologies. Electromagnetic transient (EMT) simulation results validate the fault interruption and power flow control performance of the interline multiport DCCB with PFC.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | B4_11857_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Canada |
| Study committees | |
| File size | 695 KB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
ZHANG Zhi Jin {Justin} - The University of British Columbia, Canada; FERDOUS Maliha - The University of British Columbia, Canada; YANG Qichen - University of Central Florida, USA; SAEEDIFARD Maryam - Georgia Institute of Technology, USA
Keywords
Multi-terminal DC (MTDC), high-voltage DC (HVDC), DC circuit breaker (DCCB), DC power flow controller (DCPFC), multiport, interline
