Direct-current circuit breaker and application method thereof

Abstract

The invention discloses a direct-current circuit breaker and an application method thereof. The direct-current circuit breaker comprises a plurality of through-flow units which are respectively arranged on a plurality of direct-current lines; the input ends of the plurality of first bridge arm switch units are respectively connected with a plurality of direct current lines in a one-to-one correspondence manner, the output ends of the plurality of first bridge arm switch units are connected with the input end of the current limiting unit, and the output end of the current limiting unit is respectively connected with the input end of the on-off unit and the input end of the energy absorption unit; the output end of the on-off unit and the output end of the energy absorption unit are connected with the first end of the blocking unit, the input ends of the multiple second bridge arm switch units are connected with the multiple direct-current lines in a one-to-one correspondence mode, the output ends of the multiple second bridge arm switch units are connected with the first end of the blocking unit, and the second end of the blocking unit is connected with a direct-current bus of the direct-current lines. According to the circuit breaker, all direct current systems share the direct current circuit breaker current limiting unit, the breaking unit and the energy absorption unit, the total size of the direct current circuit breaker in the multi-direct-current outgoing line converter station is reduced, and overall arrangement and design of the converter station are facilitated.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a DC circuit breaker and an application method thereof. Background technique [0002] High-voltage DC circuit breaker is one of the core equipment for multi-terminal and DC grid construction, and it is also an important equipment for flexible switching operation mode and breaking fault current of DC transmission system. Its technical economy directly affects the flexibility and extensiveness of DC power grid applications. [0003] At present, there are two main technical routes for high-voltage DC circuit breakers. One is a hybrid DC circuit breaker. The circuit breaker is normally operated by a mechanical switch to pass the current, and when a fault occurs, the auxiliary commutation branch is used to transfer the current to the power connected in parallel. In the electronics branch, the current is then broken by the power electronics. This type of circuit breaker has...

AI Technical Summary

Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a DC circuit breaker and its application method to solve the problem that existing hybrid DC circuit breakers or mechanical DC circuit breakers are difficult to meet the technical and economical requirements of large-scale DC power grid construction at the same time. Technical issues with double requirements

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