Converter, safety protection method thereof and hard crowbar circuit

Abstract

The invention discloses a converter, a safety protection method thereof and a hard crowbar circuit. The method is applied to a control unit of the converter. The hard crowbar circuit is connected between a positive direct-current bus and a negative direct-current bus of the converter; the hard crowbar circuit comprises a choking coil and N crowbar units which are connected in series, and the hard crowbar circuit and a middle backflow supporting capacitor in the converter form an energy absorption loop; and each crowbar unit comprises a controllable switching device of which the control end is connected with the control unit. The safety protection method comprises the following steps: receiving a state detection signal for the converter; judging whether an IGBT single tube failure fault or a bridge arm cut-through fault occurs in the converter according to the state detection signal; if yes, sending a starting signal to each controllable switching device in the hard crowbar circuit, so that safety protection is carried out on the converter based on the energy absorption loop; and if not, maintaining the turn-off state of each controllable switching device. Safety protection can be carried out on the converter in time, and further deterioration of faults and influence on other elements are avoided.

Description

technical field [0001] The present application relates to the technical field of electric power transmission, in particular to a converter, a safety protection method thereof and a hard crowbar circuit. Background technique [0002] The traction converters of modern rail vehicles are generally based on IGBT power integration modules as the core components for realizing electric energy conversion, including the core components in rectifiers and inverters. [0003] As far as the application situation is concerned, while the IGBT power integrated module brings convenience in terms of simplification and integration, it also exposes some problems. For example, a single tube failure short circuit often occurs during the use of the IGBT, causing the IGBT bridge arm to break through. , which in turn leads to the bursting of the IGBT components. When the impact energy released by the explosion is severe, the cabinet door of the converter will be deformed, causing large economic losse...

AI Technical Summary

Problems solved by technology

[0003] As far as the application situation is concerned, while the IGBT power integrated module brings convenience in terms of simplification and integration, it also exposes some problems. For example, a single tube failure short circuit often occurs during the use of the IGBT, causing the IGBT bridge arm to break through. , which in turn leads to the bursting of the IGBT components. When the impact energy released by the explosion is severe, it will cause the deformation of the converter cabinet door, resulting in large economic losses and relatively bad effects, affecting the normal operation of the vehicle.

[0004] In this regard, most of the existing technologies only use safety explosion-proof devices to provide a discharge path for the airflow after the module explodes. This is a countermeasure taken after a failure, which cannot improve the safety performance of the module itself, nor can it reduce the explosion rate of the module. The device loss caused by the explosion of the module; and the position of the explosion of the module is not fixed, which leads to the inaccurate positioning of the safety explosion-proof device and affects the actual use effect

Images