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Title
Japanese: 
English:A concept of multi-circuit HVDC transmission system for selective fault clearing without DC circuit breakers 
Author
Japanese: 佐野 憲一朗.  
English: Kenichiro Sano.  
Language English 
Journal/Book name
Japanese: 
English:International Conference on Smart Grids and Energy Systems (SGES 2020) 
Volume, Number, Page        
Published date Nov. 2020 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English:International Conference on Smart Grids and Energy Systems (SGES 2020) 
Conference site
Japanese: 
English: 
Abstract This paper proposes a multi-circuit high voltage dc (HVDC) transmission system for realizing fault-tolerant HVDC grid without dc circuit breakers. The proposed system consists of multiple dc lines connected in parallel by fault-blocking diodes. When a fault occurs in one of the dc lines, the system clears the faulted dc line using an ac circuit breaker and the diode. Thus, the proposed system realizes the selective fault clearing without dc circuit breakers, whereas the existing HVDC grids usually require dc circuit breakers. In addition, the power plants connected to the faulted line can immediately restart their operation by changing their connection to the other non-faulted dc line. Therefore, all the power plants in the proposed system can continue their operation under a single dc fault, which corresponds to the N-1 criteria of the existing ac grid. Simulation results verify that all the power plants in the proposed system can continue or restart their operation after a fault in the dc line.

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