A Modular Current Limiting Circuit Breaker Power Module with Additional Diodes

Abstract

The invention provides a modularized current-limiting circuit breaker power module with additional diodes. The power module comprises power sub-modules connected with a reactor or a power resistor in parallel; after an anti-parallel circuit 1 and an anti-parallel circuit 2 of the power sub-modules are connected in series, the anti-parallel circuit 1 and the anti-parallel circuit 2 are connected with a damping circuit and a lightning arrester which are connected in parallel; the anti-parallel circuit 1 and the anti-parallel circuit 2 respectively comprise a device capable of being switched off and the additional diode, wherein each device is provided with an anti-parallel diode, and each additional diode is connected with the corresponding device which can be switched off and provided with the anti-parallel diode, and the cathode of the additional diode of the anti-parallel circuit 1 is connected with the cathode of the additional diode of the anti-parallel circuit 2; the additional diodes are additional diodes selected from standard recovery diodes or silicon carbide diodes. The current-limiting circuit breaker power module reduces the active power loss caused when a modularized solid current limiter normally runs and the weight of the modularized solid current limiter, and the size and the cost are reduced.

Description

[0001] Technical field: [0002] The invention relates to a short-circuit protection device for a power system, in particular to a modular current-limiting circuit breaker with additional diodes and its power module, belonging to the field of 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 ...

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, which leads to a very large steady-state loss of the system. Large is the biggest flaw of this fault current limiter

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