期刊
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
卷 66, 期 3, 页码 2444-2453出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2018.2829666
关键词
Fault tolerance; ground faults; half-bridge modular multilevel converter; high-voltage direct-current systems; station internal fault
资金
- People Programme (Marie Curie Actions) of the EU FP7 Programme (FP7/2007-2013) through the project Multi-terminal DC grid for offshore wind (MEDOW) [317221]
- EU FP7 Programme through the project Beyond State of the art Technologies for re-Powering AC corridors & multi-Terminal HVdc Systems (BEST PATHS) [612748]
- EPSRC [EP/E036503/1] Funding Source: UKRI
Although the probability of occurrence of station internal ac grounding faults in modular multilevel converter (MMC)-based high-voltage direct-current systems is low, they may lead to severe consequences that should be considered when designing protection systems. This paper analyzes the characteristics of valve-side single-phase-to-ground (SPG) faults in three configurations of MMC systems. Fault responses for symmetrical monopole MMCs are first studied. Upper arm overvoltages and ac-side nonzero-crossing currents arising from SPG faults in asymmetrical and bipolar configurations are then investigated. DC grounding using an LR parallel circuit is employed to create current zero-crossings, which will enable the operation of grid-side ac circuit breakers. The theoretical analysis is verified through simulations performed in PSCAD/EMTDC, with simulation results and the theoretical analysis showing a good agreement. The studies in this paper will be valuable for the design of protection systems for station internal ac grounding faults.
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