Abstract
The paper looks through the fault location algorithm of multi-terminal direct-current (MTDC) hybrid transmission systems based on line-commutated converter (LCC) and modular multi-level converter (MMC). Generally, it has two issues which required to be addressed: (1) the travelling wave (TW) fault location algorithm suitable for the multi-terminal transmission system; and (2) the method of acquiring or processing the TW signal. In this paper, a novel TW fault location algorithm suitable for the LCC-MMC-HVDC hybrid transmission system is researched based on the Hilbert-Huang transform (HHT). Firstly, the TW propagation process characteristic of hybrid LCC-MMC-MTDC transmission system is studied. Secondly, a novel TW fault location algorithm based on HHT is proposed. Eventually, a typical ±400 kV LCC-MMC-MTDC hybrid transmission system is established via PSCAD/EMTDC software for the case study to investigate the accuracy of the proposed algorithm. Afterwards, its robustness against fault location issue, fault resistance issue and fault type issue is also confirmed.
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