Open AccessAnalysis of the fault current limiting requirement and design of the bridge‐type FCL in the multi‐terminal DC grid
Author(s) -
He Jiawei,
Li Bin,
Li Ye
Publication year - 2018
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2017.0493
Subject(s) - fault current limiter , converters , grid , current limiting , fault (geology) , limiter , engineering , terminal (telecommunication) , computer science , electrical engineering , circuit breaker , electronic engineering , control theory (sociology) , current (fluid) , voltage , electric power system , power (physics) , telecommunications , physics , geometry , mathematics , quantum mechanics , control (management) , artificial intelligence , seismology , geology
In the multi‐terminal flexible dc grid, it is important for the healthy network to ride through the dc fault. The converters should operate continuously after dc faults, staying unblocked. But the existing selective protection and isolation method may fail to react swiftly enough, because the propagation speed of the dc fault current is extremely fast. This paper discussed the fault current limiting requirements and proposed a calculation method to determine the required dc reactor value, for the purpose of the converter continuous operation during dc faults. On this basis, the bridge‐type fault current limiter (FCL) was proposed for using in the dc grid, due to merits including minor negative influence on dc grid normal operation, fast response to dc faults and efficient coordination with the dc circuit breaker (DCCB). The parameter design principle of the bridge‐type FCL for dc grid was also discussed. Then the scaled‐down dc experiment test circuit was built to verify the working principle and performance of the bridge‐type FCL. Finally, the simulation cases based on the PSCAD/EMTDC were carried out to verify the feasibility of the theoretical calculation method and the superiority of the proposed bridge‐type FCL for using in the dc grid.