Current limiting and capacitor commutated hybrid DC circuit breaker
DOI：10.7667/PSPC171834
Key Words:multi-terminal DC system  HVDC transmission  overhead line  fault limitation  HVDC circuit breaker
Author NameAffiliationE-mail
WANG Jiangtian NARI-Relays Electric Co., Ltd., Nanjing 211102, China  
WANG Xingguo State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China wangxingguo@epri.sgcc 
MA Jing State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China  
ZHOU Zexin State Key Laboratory of Power Grid Safety and Energy Conservation, China Electric Power Research Institute, Beijing 100192, China  
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Abstract:With MMC-HVDC technology gradually expanding to overhead line transmission occasions, the rapid identification and isolation of fault lines is particularly important. Compared with the cable line, the overhead line transmission is prone to happening short circuit, flashover and other transient faults, and corresponding measures must be taken to isolate the fault line to avoid system outage immediately. DC circuit breaker has captured great attention from the community at home and abroad as the core equipment of isolating fault circuit. A new type of hybrid DC circuit breaker topology is proposed based on the existing DC circuit breaker technical scheme. The circuit breaker can effectively restrain the amplitude of short circuit current through the current limiting inductance, and avoid the synchronous driving and voltage sharing of large orders of IGBT series by means of capacitive buffer action. A model of four-terminal double bipolar HVDC grid is built on the PSCAD/EMTDC, and the simulation results show that the DC circuit breaker can meet the demand of fast resection of the fault line. This work is supported by Science and Technology of State Grid Corporation of China (No. JBB17201600241) “Study on AC Power Grid Protection Influenced by ±500 kV Flexible DC Power Grid”.
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