Analysis of the equivalent fault characteristics of DC system and its impact on distance protection based on power-frequency variation.

Autor:	Cai, Dongxiao, Li, Haifeng, Zhu, Xinchi
Předmět:	HIGH-voltage direct current transmission ELECTRIC faults ELECTRIC impedance SIMULATION methods & models ELECTRIC immittance
Zdroj:	Journal of Engineering; Apr2019, Vol. 2019 Issue 4, p1275-1279, 5p
Abstrakt:	Here, the response characteristics of high-voltage DC (HVDC) control system are studied in the case that fault occurs in the sending-end AC system. Then the characteristics of DC system which is equivalent to power-frequency variation impedance in the fault super-imposed network are analysed by mathematical derivation and verified by simulations on PSCAD/EMTDC. The result shows that the equivalent power-frequency variation impedance of HVDC system is affected by the rated capacity and the parameters of HVDC control system. The power-frequency variation impedance becomes capacitive under certain fault conditions, which reduces the zone of distance protection based on power-frequency variation and even leads to the operation failure. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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