IGCT (Integrated Gate Commutated Thyristor) semiconductor switching device based short-circuit current limit method

Abstract

The invention relates to an IGCT semiconductor switching device based short-circuit current limit method. The method includes the steps of (1), environmental classification of short-circuit current occurrence; (2), short-circuit current contrast of an infinite power system and a limited power system; (3), construction of an IGCT short-circuit current based current limiting topology circuit; (4), specifically identifying of a current limiting process; (5), completely disconnecting of a circuit in short-circuit fault through a circuit breaker after the current limiting of the short-circuit current, and fault repair. The IGCT semiconductor switching device based short-circuit current limit method can provide protection faster than that of mechanical switches and faster re-starting, is high in working reliability and long in service life, and effectively limits the short-circuit current so as to solve the problem of excessive short-circuit capacity of an electricity system and reduce the short-circuit current design capacity standard of electrical equipment such as transformers and circuit breakers in a power grid, thereby bringing great economic benefits.

Description

technical field [0001] The invention belongs to the technical field of power system automation, in particular to a short-circuit current limiting method based on an IGCT semiconductor switching device. Background technique [0002] At present, circuit breakers are widely used in power systems to break the full amount of short-circuit current to protect the safe operation of the system, but the breaking capacity of existing circuit breakers can no longer meet the needs of the increase of short-circuit current in the system. For this reason, the method that has been adopted is to install fast fuses on the lines that may have huge short-circuit currents, but it destroys the selectivity of protection and reduces the automation level of system operation. This problem has not been effectively solved, so it is urgent to develop a grid current limiting device that can suppress the short-circuit current without destroying the original protection selectivity of the system, so as to li...

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