A thyristor-based DC circuit breaker topology with bidirectional blocking function

Abstract

A thyristor-based bidirectional DC circuit breaker topology with bidirectional blocking function, comprising a main branch module (1), a thyristor capacitor branch module (2), a first diode group (3) and a second diode Composed of tube groups (4); the first lead-out terminal of the main branch module (1) is connected to the anode of the first diode group (3), and its connection point is used as the first lead-out terminal of the DC circuit breaker topology ( 5); the second lead-out terminal of the main branch module (1) is connected to the anode of the second diode group (4), and its connection point is used as the second lead-out terminal (6) of the DC circuit breaker topology; the second The cathode of a diode group (3) is connected to the cathode of the second diode group (4), and is connected to the connection point (7) with the first lead-out terminal of the thyristor capacitor branch module (2); the thyristor capacitor The second lead-out terminal of the branch module (2) serves as the third lead-out terminal (8) of the DC circuit 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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