AC-DC-AC auxiliary converter of motor train unit and working process of AC-DC-AC auxiliary converter

Abstract

The invention relates to an AC-DC-AC auxiliary converter of a motor train unit and a working process of the AC-DC-AC auxiliary converter. The auxiliary converter comprises a controller, a pre-charge circuit, a boosting transformer, an input filter circuit, a rectifier circuit, a discharge circuit, an inverter module, an output filter module and an output contactor, wherein the pre-charge circuit, the boosting transformer, the input filter circuit, the rectifier circuit, the discharge circuit, the inverter module, the output filter module and the output contactor are connected with the controller; when the auxiliary converter is started, the pre-charge circuit is charged; when charging voltage reaches a certain level, the pre-charge circuit is disconnected and the auxiliary converter works without resistance; when the auxiliary converter works normally, the auxiliary converter inputs three-phase AC and boosts the three-phase AC through the boosting transformer TR1; when input voltage is over a zero point, a PWM rectifier is started, output voltage reaches stable DC voltage through a unipolar four-quadrant double closed-loop control algorithm of the PWM rectifier; rated three-phase AC voltage is output through a voltage space vector SVPWM control mode of the inverter; and a load is provided with electricity through the output filter circuit and the output contactor. By the auxiliary converter and the working process thereof, the power supply reliability of the auxiliary converter can be improved.

Description

technical field [0001] The invention relates to the technical field of converters, in particular to an AC-DC-AC auxiliary converter for an EMU and its working process. Background technique [0002] The auxiliary converters of domestic EMUs have a variety of models. The auxiliary converter modules of most models share a DC link with the traction converter module. The auxiliary converter related equipment is installed in the traction converter without separate box, resulting in a complex structure of the converter, which is not conducive to later maintenance; some auxiliary converters of EMUs are divided into two types: single auxiliary converter and double auxiliary converter, of which two auxiliary converters need to be considered The parallel operation of the converters requires a relatively complicated control method; these models all adopt the DC-to-AC conversion mode, and are powered by the intermediate DC circuit of the traction converter. The power supply system is rel...

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Problems solved by technology

[0002] The auxiliary converters of domestic EMUs have a variety of models. The auxiliary converter modules of most models share a DC link with the traction converter module. The auxiliary converter related equipment is installed in the traction converter without separate box, resulting in a complex structure of the converter, which is not conducive to later maintenance; some auxiliary converters of EMUs are divided into two types: single auxilia...

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