A Modular Current Limiting Circuit Breaker Power Module

Abstract

The invention provides a modularized current-limiting breaker power module. The power module comprises a power sub-module connected with an electric reactor or a power resistor in parallel. The power sub-module comprises a first power sub-module, a second power sub-module and a lightning arrester, wherein the first power sub-module, the second power sub-module and the lightning arrester are connected in parallel. The first power sub-module and the second power sub-module comprise parallel circuits and series diodes connected with the parallel circuits in series. Each parallel circuit comprises a device capable of being turned off, an antiparallel diode and a damping circuit, wherein the antiparallel diode is connected with the device capable of being turned off in an antiparallel mode, and the damping circuit is connected with the antiparallel diode in parallel. The series diodes are any type of series diodes selected from standard recovery diodes or silicon carbide diodes. According to the modularized current-limiting breaker power module, active power loss generated when a modularized solid current-limiting device operates normally is reduced, the weight of the modularized solid current-limiting device is reduced, the size is reduced, and the cost is lowered.

Description

[0001] Technical field: [0002] The invention relates to a short-circuit protection device for an electric power system, in particular to a modular current-limiting circuit breaker and its power module, belonging to the field of electric power systems. [0003] Background technique: [0004] With the rapid development of the power grid, the successive investment of large power sources in load centers, and the interconnection of large regional power grids, excessive short-circuit current has gradually become one of the prominent problems. [0005] Short circuit current limiter (Short Circuit Current Limiter, SCCL) or fault current limiter (Fault Current limiter, FCL) provides a new idea and new method for solving the problem of short circuit current exceeding the standard. [0006] Accurate classification of fault current limiting techniques is difficult due to the wide variety of ways in which short circuit current limiters (SCCLs) or fault current limiters (FCLs) achieve curr...

AI Technical Summary

Problems solved by technology

[0014] Among the existing fault current limiters, the one that has the prospect of large-scale market application is the cascade connection of multiple identical power modules, and the power device used in each power module is a turn-off device with an anti-parallel diode; the anti-parallel diode and The turn-off devices are packaged together. When the system is running in a steady state, the line current flows through the turn-off devices and anti-parallel diodes in each power module. This results in a very large steady-state loss of the system. How to reduce the On the basis of steady-state losses, it is an urgent technical problem to ensure that the power electronic devices that can be turned off can withstand the reverse voltage drop

Images