Abstract
Recently, in order to overcome the difficulties of interrupting fault currents in multi-terminal direct current systems (MTDC), studies combining a saturated iron-core type superconducting current limiter (SFCL) and a direct current circuit breaker (DCCB) have been conducted. However, the effect of inductance change of the SI-SFCL on the interrupting time of the DCCB during fault has not been studied yet. In this paper, the interrupting time delay caused by the dynamic behavior of the inductance change during the fault current blocking process of the SI-SFCL combined with a DCCB was analyzed through experiments and a new fault detection method considering this phenomenon was proposed. After designing and manufacturing the laboratory-scale SI-SFCL and DCCB, a fault current interrupting test was performed and the inductance change pattern of the SI-SFCL was analyzed. Based on the analysis results, a new fault detection technique was proposed to alleviate the interruption time delay that occurs when applying the combined protection system to a MTDC, and its effectiveness was verified through a simulation. These results will be useful for planning protection coordination strategies when introducing a SI-SFCL in combination with a DCCB in actual MTDC systems.
Highlights
High-voltage direct current (HVDC) systems are playing an increasingly important role in energy transmission due to their technological and economic advantages over high-voltage alternating current (HVAC) systems for long-distance and submarine transmission [1,2]
The interrupting time delay caused by the inductance change of the SI-SFCL in the combined protection system of a SI-SFCL and a direct current circuit breaker (DCCB) was analyzed by an experimental test and, based on the results, a suitable fault detection scheme was proposed to effectively apply the combined protection system to a multi-terminal direct current systems (MTDC) and its effectiveness was verified through a simulation
A protection system combining an SI-SFCL and a mechanical CB that can be applied to MTDC grid systems was constructed and the fault current limiting and interrupting characteristics were experimentally analyzed
Summary
High-voltage direct current (HVDC) systems are playing an increasingly important role in energy transmission due to their technological and economic advantages over high-voltage alternating current (HVAC) systems for long-distance and submarine transmission [1,2]. The interrupting time delay caused by the inductance change of the SI-SFCL in the combined protection system of a SI-SFCL and a DCCB was analyzed by an experimental test and, based on the results, a suitable fault detection scheme was proposed to effectively apply the combined protection system to a MTDC and its effectiveness was verified through a simulation. Solve this problem, an effective fault current operationtechnique time of theapplicable circuit breaker was delayed due to the increase rate of the fault current detection to a SI-SFCL was proposed, and it was confirmed through was reduced by the. To solve this problem, an effective fault current detection simulation that this problem was alleviated. Protection coordination strategy for DC systems to which a SI-SFCL is applied
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