Novel circuit topological structure of high-power four-quadrant rectifier

Abstract

The invention discloses a circuit topological structure of a high-power four-quadrant rectifier, comprising a three-phase connecting wire led from a high-voltage terminal, and a transformer T, wherein the three-phase connecting wire is connected with a primary coil of the transformer T; a secondary coil of the transformer T is connected with a bridge rectifier circuit consisting of rectifier cabinets CU1 and CU2 through a lead wire; a bridge arm of the bridge rectifier circuit is respectively connected with circulation reactors L1, L2, L3 and L4 in series; both output ends of the bridge rectifier circuit are respectively connected with a disconnecter in series through a lead wire and then respectively switched into both ends of superconductive load SC; and a bypass cabinet BP is connected between both output ends of the bridge rectifier circuit in parallel. In the circuit structure, a back-to-back mode of a thyristor is changed into a bridge back-to-back mode, and the possibility of false triggering is greatly reduced. The peak value of short-circuit current can be greatly reduced even if short trouble of false triggering happened. The invention greatly improves the safety and the reliability of the operation of the rectifier.

Description

technical field [0001] The invention relates to a circuit topology structure of a high-power four-quadrant rectifier. Background technique [0002] In many cases, four-quadrant rectifiers are thyristors "back to back". The disadvantage of this structure is that when the thyristors of the positive bridge bear the reverse voltage, the thyristors of the reverse bridge just bear the forward voltage, and it is easy to cause a short-circuit fault triggered by mistake. [0003] Once the false trigger short-circuit fault of the bridge arm occurs, the AC side of the rectifier is alternately in the process of two-phase and three-phase short-circuit, resulting in a fault short-circuit current with a large peak value. If the fast fuse cannot act immediately, it may cause the entire bridge arm to catch fire, or even burn the entire power supply. Contents of the invention [0004] The purpose of the present invention is to provide a circuit topology of a high-power four-quadrant recti...

AI Technical Summary

Problems solved by technology

The disadvantage of this structure is that when the thyristor of the positive bridge bears the reverse voltage, the thyristor of the reverse bridge just bears the forward voltage, and it is easy to cause a short-circuit fault triggered by mistake

[0003] Once the false trigger short-circuit fault of the bridge arm occurs, the AC side of the rectifier will be in the alternate process of two-phase and three-phase short-circuit, resulting in a large peak fault short-circuit current

If the fast fuse cannot act immediately, it may cause the entire bridge arm to catch fire, or even burn the entire power supply

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