Abstract
The use of overhead lines for power transmission in the future high-voltage and large-capacity voltage-source converter (VSC)-based direct current (DC) grid will significantly increase the probability of temporary faults. To eliminate potential adverse impacts such as erroneous protection, line-insulation failure, and even damage to power electronic devices resulting from a DC breaker reclosing operation with the traditional sequential auto-reclosing strategy, a novel sequential auto-reclosing strategy for hybrid HVDC breakers (HHBs) in VSC-based DC grids is proposed. This strategy is based on the step-by-step operation of the transfer branch in the HHB. As a result, du/dt resulting from the HHB reclosing operation is greatly reduced, and therefore those potential negative impacts can be eliminated. Several other advantages are also presented. The feasibility and validity of the proposed strategy are verified in a four-terminal annular VSC-based DC grid electromagnetic transient model.
Highlights
The voltage-source converter (VSC)-based direct current (DC) grid [1,2,3] has been anecdotally recognized as a feasible solution for optimal allocation, wide-area reciprocity, and flexible consumption of large-scale renewable energy [4, 5]
Temporary faults will be more likely because of the use of Overhead lines (OHLs) in unpredictable and harsh environments. Both fault isolation and system recovery are crucial problems [9,10,11] urgently to be solved in the construction of the high-voltage and largecapacity VSC-based DC grid
We call this the traditional sequential auto-reclosing strategy in this paper, and with its help, the fault current can be interrupted immediately if a permanent fault is detected. Potential negative impacts such as erroneous protection, line-insulation failure, and even damage to power electronic devices will occur when the fault is temporary. To eliminate these potential negative impacts in the system-recovery procedure, a novel sequential auto-reclosing strategy for hybrid HVDC breakers (HHBs) in VSC-based DC grids is proposed in this paper
Summary
The voltage-source converter (VSC)-based direct current (DC) grid [1,2,3] has been anecdotally recognized as a feasible solution for optimal allocation, wide-area reciprocity, and flexible consumption of large-scale renewable energy [4, 5]. Once a permanent fault is detected, all the fully-controlled fast-power electronic switches in the transfer branch will be immediately de-energized synchronously to interrupt the fault current. We call this the traditional sequential auto-reclosing strategy in this paper, and with its help, the fault current can be interrupted immediately if a permanent fault is detected. Potential negative impacts such as erroneous protection, line-insulation failure, and even damage to power electronic devices will occur when the fault is temporary To eliminate these potential negative impacts in the system-recovery procedure, a novel sequential auto-reclosing strategy for HHBs in VSC-based DC grids is proposed in this paper.
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