Open AccessResonance frequency‐based protection scheme for ultra‐high‐voltage direct‐current transmission lines
Author(s) -
Yang Yayu,
Tai Ningling,
Fan Chunju,
Yang Lian,
Chen Shi
Publication year - 2018
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.2017.0488
Subject(s) - electrical impedance , fault (geology) , voltage , transmission line , line (geometry) , sensitivity (control systems) , electric power transmission , control theory (sociology) , scheme (mathematics) , computer science , resonance (particle physics) , electronic engineering , engineering , electrical engineering , physics , mathematics , artificial intelligence , mathematical analysis , geometry , control (management) , particle physics , seismology , geology
Direct‐current (DC) line faults are a major issue in ultra‐high‐voltage direct‐current systems due to the complex and wicked environment. Thus, reliably detecting and isolating the DC line faults are not a trivial engineering task. This study proposes a DC line protection scheme based on resonance frequency. The scheme mainly consists of a fault discrimination criterion and a faulty pole selection criterion. The fault discrimination criterion is based on the phase of the resonance frequency impedance, and it is deployed to differentiate the faults on the protected DC line from the external faults. The faulty pole selection criterion is based on the ratio of the resonance frequency currents, and it is employed to select the faulty pole. The sensitivity analysis demonstrates that the performance of the proposed protection is promising. The simulations carried out in PSCAD/EMTDC under various conditions verify the feasibility and validity of the proposed protection scheme.