Versatile transformers for traction drive systems

Abstract

The invention discloses a multifunctional transformer used in a traction transmission system, comprising: a high-voltage level component connected to the traction network; the high-voltage level component is formed by cascading n levels of the same bridge-type power sub-modules; stage components, including more than one high-frequency modulation circuit and more than one high-frequency transformer, the high-frequency modulation circuit modulates the DC voltage transformed by the high-voltage stage component into a high-frequency square wave voltage, and then the high-frequency transformer is coupled to the secondary side The two windings are sent to the output-stage components; the output-stage components, including the high-frequency H-bridge rectifier circuit, restore the high-frequency square wave coupled through the high-frequency transformer into a high-quality DC voltage output for the traction inverter, auxiliary An inverter provides energy. The invention can reduce the weight of the train, reduce the volume of the train, improve the running performance of the vehicle and the capacity of the railway, and improve the power quality and utilization rate of the power grid.

Description

technical field [0001] The invention mainly relates to the technical field of locomotive traction, in particular to a multifunctional transformer suitable for traction transmission systems of electric locomotives and EMUs. Background technique [0002] In traction transmission systems such as electric locomotives and EMUs, the main traction transformer is a single-phase power frequency transformer with a single primary side and multiple secondary sides. The volume and weight of the main transformer are huge, which has a certain impact on the space utilization and high-speed operation of the locomotive, especially the EMU. At the same time, when the train is braking, it will generate a large amount of braking energy. If the braking energy is not used effectively, not only will the energy utilization rate of the traction network be low, but the braking energy will also increase the voltage of the traction network abnormally. result in damage to the equipment. When the train ...

AI Technical Summary

Problems solved by technology

[0006] (1) The volume and weight are large, which affects the passenger capacity and high-speed performance of the train, especially on EMUs with dispersed power. The limitation of installation space makes the impact of transformer volume and weight particularly prominent;

[0007] (2) The output voltage of the power frequency transformer will change with the change of the load, and the drop of the output voltage will bring difficulty to the transmission control;

In this way, the train will have a speed loss;

[0009] (4) Power frequency transformers need to use cooling oil, which is easy to cause pollution to the environment

[0010] (5) When the train is braking, it will generate a lot of feedback energy. If the braking energy is not effectively used, not only will the energy utilization rate of the traction network be low, but the braking energy will also increase the voltage of the traction network abnormally. , resulting in equipment damage

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