Open AccessSimulation study on commutation failure control and recovery of UHVDC with hierarchical connection mode
Author(s) -
Sichao Wang,
Jinyu Wen,
Dongshan He,
Xin Geng
Publication year - 2019
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1303/1/012086
Subject(s) - commutation , fault (geology) , hierarchy , transmission system , transmission (telecommunications) , process (computing) , reliability (semiconductor) , control theory (sociology) , voltage , computer science , engineering , reliability engineering , control (management) , electrical engineering , power (physics) , law , physics , quantum mechanics , artificial intelligence , seismology , geology , political science , operating system
UHVDC transmission projects with hierarchical receivers are connected in series on the DC side. When a single voltage level of AC system fails, commutation failure may occur in both hierarchies of DC system, and the impact will be more serious when the electrical connection is strong. In the process of fault recovery, inappropriate control strategy will also lead to successive commutation failures. In this paper, a commutation failure control and recovery strategy based on real-time fault detection and determination is proposed. In view of the instantaneous faults of AC system, the starting time is determined according to the predicted results of commutation failure, so as to reduce the starting times and prevent the continuous commutation failure in the recovery process. When the single-hierarchy AC system is permanently severely faulted, the fault hierarchy is isolated and the non-fault layer operates normally. The PSCAD/EMTDC simulation model of an UHVDC transmission project is built. Instantaneous and permanent faults are set up to simulate. It is verified that the proposed strategy can effectively reduce the number of successive commutation failures and improve transmission reliability.