Open AccessCurrent differential protection principle of HVDC transmission system
Author(s) -
Gao Shuping,
Liu Qi,
Song Guobing
Publication year - 2017
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/iet-gtd.2016.1380
Subject(s) - fault (geology) , transmission line , transient (computer programming) , control theory (sociology) , electric power transmission , current (fluid) , differential protection , differential (mechanical device) , computer science , line (geometry) , reliability (semiconductor) , point (geometry) , transmission (telecommunications) , voltage , electronic engineering , engineering , electrical engineering , mathematics , telecommunications , physics , control (management) , artificial intelligence , aerospace engineering , transformer , power (physics) , geometry , quantum mechanics , seismology , geology , operating system
Traditional high‐voltage DC (HVDC) current differential protection has problems on identifying fault current and has long delay. In this study, a novel current differential protection principle for HVDC transmission lines is proposed. By the adoption of distributed parameter model, differential current criterion is formed at a selected point on the transmission line. When fault occurs on DC line, setting point differential current reaches a high value. When no fault occurs or fault occurs outside the DC line, setting point differential current reaches a small value. Comparing with the traditional current differential protection, the proposed principle eliminates the impact of distributed capacitive current and has no requirement of delay. Comparing with travelling wave protection, fault identification can be performed during both transient and steady states, and the proposed method has reasonable sampling frequency requirements and has high reliability. Simulation analysis shows that the proposed principle identifies faults reliably and rapidly. The proposed principle is theoretically novel and practically applicable.