Basic Topology, Modeling and Evaluation of a T-Type Hybrid DC Breaker for HVDC Grid

Hybrid circuit breaker (HCB) has shown good performance for interrupting dc fault current. However, a massive number of IGBTs in series is needed. These will lead to high costs and significant difficulty in balancing IGBT dynamic voltage. This paper proposes a bidirectional hybrid circuit breaker ba...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2021-10, Vol.36 (5), p.2995-3004
Main Authors: Zhu, Jin, Guo, Xingming, Yin, Jingyuan, Huo, Qunhai, Wei, Tongzhen
Format: Article
Language:English
Subjects:
Bridges
Capacitors
Circuit breakers
Circuit faults
Circuits
Converters
dc grid
Fault currents
H-bridge
Hybrid circuits
Hybrid systems
Insulated gate bipolar transistors
Integrated circuit modeling
MMC
Modular systems
T-type HCB
Topology
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Summary:Hybrid circuit breaker (HCB) has shown good performance for interrupting dc fault current. However, a massive number of IGBTs in series is needed. These will lead to high costs and significant difficulty in balancing IGBT dynamic voltage. This paper proposes a bidirectional hybrid circuit breaker based on a cascaded half-bridge submodule structure to reduce the overall costs and implementation difficulty of HCB. The number of IGBTs is reduced by 50%, and the operating speed is fast enough. A model of a four-terminal modular multilevel converter (MMC) system with a proposed hybrid circuit breaker in different stages is developed to describe the fault blocking process more clearly. The performance of the proposed HCB is validated and compared with other HCB structure through both theoretical derivation and time-domain simulation.
ISSN:0885-8977
1937-4208
DOI:10.1109/TPWRD.2020.3031671