A Topology of H‐Type High‐Voltage DC Circuit Breaker with Current‐Limiting Function and its Control Strategy.

A high‐voltage direct‐current circuit breaker is a key equipment to construct a flexible direct current transmission system. Most of the existing design schemes have some shortcomings such as slow fault‐breaking speed, poor current‐limiting effect, large capacity of the arrester, and long reclosing operation time. To solve the above problems, this paper proposes an H‐type high‐voltage direct current circuit breaker with a current‐limiting function. The current‐limiting inductance is put into operation by judging the fault condition. It has good current‐limiting ability in the process of fault‐breaking and can maintain the dynamic performance of the power grid in the normal operation of the system. It has the advantages of fast fault‐breaking speed, buffered energy consumption, early separation of fault points, and small capacity of the arrester. During reclosing operation, the transfer branch can be turned on at no‐voltage. The different working states in the process of fault‐breaking are analyzed theoretically based on the description of the topological structure and working principle. Finally, using the PSCAD/EMTDC simulation platform, the functional verification and system verification of fault‐breaking and the reclosing operation process is conducted. Compared with the typical scheme, the simulation analysis shows the effectiveness and applicability of the function of fast fault‐breaking and fault current‐limiting. © 2020 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC. [ABSTRACT FROM AUTHOR]