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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Problems solved by technology

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 limit the peak value of the short-circuit current, so that the existing circuit breaker can Normal breaking, to effectively protect the safety of various electrical and electronic equipment, minimize the scope of faults, and ensure the uninterrupted power supply of the power system

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