Journal
IEEE TRANSACTIONS ON POWER DELIVERY
Volume 35, Issue 1, Pages 386-395Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPWRD.2019.2932989
Keywords
Modular multilevel converters (MMC); fault location scheme; multi-terminal HVDC system; simplified transmission line representation
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Funding
- National Key R&D Program of China [2018YFB0904600]
- National Natural Science Foundation of China [51607065]
- Fundamental Research Funds for the Central Universities [2017MS002]
- European Union's Horizon 2020 Research and Innovation Programme under the Marie Sklodowska-Curie Grant [765585]
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Accurately determining the location of DC pole-to-pole short-circuit faults in modular multilevel converter (MMC) based multi-terminal HVDC (MTDC) systems is key issue in ensuring fast power recovery. This paper proposes an effective DC fault location scheme for the MMC-MTDC that uses an estimated R-L representation of the transmission lines. By using the measured voltage and current data from both ends of the faulted DC line, the proposed fault location formulas can calculate the location of the fault with high accuracy. The simplified R-L representation greatly reduces the computation burden of the fault detection algorithm. Electromagnetic transient (EMT) simulations of a four-terminal MMC-MTDC system on PSCAD/EMTDC are used to confirm the effectiveness of the proposed approach. The results verify that the proposed scheme is robust and almost not affected by the transmitted power or the fault resistance.
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