Abstract Hybrid DC circuit breaker (HDCCB) is the primary scheme for DC grid fault isolation. However, the existing HDCCB has the problem of high energy absorption and insufficient fault isolation speed. In view of the above problems, A fast fault isolation method for DC transmission lines based on distributed energy dissipation was proposed, which is based on the topology of traditional HDCCB, and add a bypass energy dissipation branch (energy dissipation branch 2). In this method, a small part of energy can be dissipated quickly by the energy dissipation branch of DCCB (energy dissipation branch 1) to realize DC fault isolation firstly, and then the residual energy of DC reactor and the DC line can be dissipated by the bypass energy dissipation branch. The scheme can greatly shorten the fault isolation time, thus reducing the energy fed into the DC power grid by power supply, and effectively reduce the total energy consumption level in single fault isolation. At the same time, the distributed energy dissipation structure can significantly reduce the level of energy absorption and the parallel branches of metal oxide varistor (MOV), and contribute to dynamic current sharing. In this paper, the working principle and control strategy of the scheme were analyzed in detail, and compared with the existing schemes in economy and technology. Finally, the feasibility and effectiveness of the scheme were validated by the simulation.
Sima Wenxia,Zhao Junning,Yang Ming等. A Fast Fault Isolation Method for DC Transmission Lines Based on Distributed Energy Dissipation[J]. Transactions of China Electrotechnical Society, 2022, 37(zk1): 126-133.
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2022, Vol. 37 
