Journal
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
Volume 110, Issue -, Pages 136-143Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijepes.2019.02.048
Keywords
Multi-terminal high voltage direct current (MTDC) grid; Hybrid DC circuit breaker (HDCCB); Fault property identification (FPI); Overhead (OH) line; Fault location
Categories
Funding
- National Natural Science Foundation of China [51677109]
- Science and Technology Project of State Grid Corporation of China [5204BB1600CS]
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In order to ensure that the healthy lines continue to operate after the line fault, the multi-terminal high voltage direct current (MTDC) grid based on half-bridge modular multilevel converter (HB-MMC) prefers to isolate the fault line using DC circuit breakers (DCCBs). Since most of overhead (OH) line faults are instantaneous faults, after the fault line is isolated, usually the DCCB will reclose with a certain delay to improve system stability. For fear of reclosing to permanent fault, this paper proposes a fault property identification (FPI) method suitable for MTDC grids with hybrid DCCBs (HDCCBs), which can distinguish between instantaneous and permanent faults. The method is based on the characteristic signal injected by the HDCCB with the auxiliary circuit. Besides, once a permanent fault has been determined, the method can also locate the fault position accurately. The effectiveness of the proposed FPI method is verified by extensive simulations in PSCAD/EMTDC platform.
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