| Autor: |
Yujun Li, Li Yan, Huang Weihuang, Faxi Peng, Jiapeng Li, Shudan Wang, Yonghui Liu, Cao Runbin |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
2021 31st Australasian Universities Power Engineering Conference (AUPEC). |
| DOI: |
10.1109/aupec52110.2021.9597709 |
| Popis: |
Fast detection and isolation of the fault line within the “capacitor discharging stage” after direct current (DC) faults has become a major challenge for multi-terminal DC (MTDC) systems comprised of voltage source converters (VSCs). Existing protection schemes rely on tedious numerical simulations to determine the threshold value. To tackle that, this paper first defines a time-domain index for fault transient signals, namely, the transient variance. The equivalence between the transient value and the high-frequency energy is then demonstrated. Accordingly, a novel protection algorithm for MTDC systems is proposed, which utilizes the transient variance to extract high-frequency components of the measured current signal and is capable of identifying the fault line fast with no need of communication. Furthermore, the error between transient fault current with distributed parameters line model and that with the lumped parameters model has been assessed as well. Numerous simulations have been conducted in PSCAD/EMTDC, which attest that the proposed algorithm can exhibit good performance under various fault locations with the proper selection of time window length. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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