A DC circuit breaker topology with bidirectional blocking function

Abstract

A direct current breaker topology with a bidirectional blocking function is disclosed. The direct current breaker topology comprises a main loop module (1), a fault current blocking module (2), a first diode group (3) and a second diode group (4); the first leading-out terminal of the main loop module (1) is connected with the positive electrode of the first diode group (3), and the connecting point between the first leading-out terminal of the main loop module and the positive electrode of the first diode group is used as the first leading-out terminal (5) of the direct current breaker topology; the second leading-out terminal of the main loop module (1) is connected with the positive electrode of the second diode group (4), and the connecting point between the second leading-out terminal of the main loop module and the positive electrode of the second diode group is used as the second leading-out terminal (6) of the direct current breaker topology; the negative electrode of the first diode group (3) is connected with the negative electrode of the second diode group (4); and the second leading-out terminal of the fault current blocking module (2) is used as the third leading-out terminal (8) of the direct current breaker topology.

Description

technical field [0001] The invention relates to a DC circuit breaker topology. Background technique [0002] Fast DC circuit breaker is one of the key equipment to ensure the stable, safe and reliable operation of DC power transmission and distribution system and DC grid system. Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system like the AC system. Therefore, the breaking of the DC current has always been a problem worth studying. topic. [0003] At present, there are usually two ways to break DC current. The first is a pure power electronic circuit breaker, such as the patent CN102870181A applied by ABB Company, which can turn off power electronic devices with high power and directly break DC current. Although the solid-state circuit breaker manufactured by this principle can meet the requirements of the multi-terminal flexible DC system i...

AI Technical Summary

Problems solved by technology

Different from the AC system, the current of the DC system does not have a natural zero-crossing point, so the natural zero-crossing point of the current cannot be used in the DC system like the AC system. Therefore, the breaking of the DC current has always been a problem worth studying. Subject

The hybrid circuit breaker manufactured by using this principle has special requirements for mechanical switches, and it is difficult to meet the requirements of the DC transmission system in terms of breaking time.

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