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Indexed by:会议论文

Date of Publication:2018-01-01

Included Journals:CPCI-S

Volume:1

Page Number:247-250

Key Words:HVDC circuit breakers; serial technology; vacuum interrupters; SF6 interrupters

Abstract:The HVDC circuit breaker is a key component of the multi-terminal DC (MTDC) transmission system. The paper proposes a novel Hybrid HVDC CB with the vacuum interrupter (VI) and SF6 interrupter (GI) in series. The artificial current zero method is used to produce current zero while the follow current loop is firstly introduced in order to achieve the "voltage-zero" for the main mechanical switch so that the dynamic electric recovery strength (DDRS) will be improved. The follow current loop is composed of the high voltage thyristors and current limiting element. The mathematic description of the "voltage-zero" and the synergy of the dynamic voltage distribution are obtained. The simulation model of the novel HVDC CB is set up according to the continuous transition model and the modified Mayr arc model with respect to the vacuum arc and SF6 arc respectively. The influence of the parameters of the current-limiting resistors and reactors in the follow current loop as well as the parameters of the oscillation circuit on the "voltage-zero" and the inverted transient recovery voltage (TRV) is gained. This paper provides a new method to improve the breaking capacity of the HVDC CB and supplies the reference for design of the HVDC CB.