Multi-system converter device

Abstract

The invention discloses a multi-system converter device. The multi-system converter device comprises an alternating current precharge unit and a direct current precharge unit. The input end of the alternating current precharge unit and the input end of the direct current precharge unit are both connected with an overhead line system. The output end of the alternating current precharge unit is connected with a PWM rectifier module. The PWM rectifier module and the direct current precharge unit are both connected with a middle direct current loop. The middle direct current loop is connected with a power supply device through a VVVF inversion module. The alternating current precharge unit and the direct current precharge unit are both connected with a change-over switch. The alternating current precharge unit, the direct current precharge unit, the change-over switch, the PWM rectifier module and the VVVF inversion module are all connected with a drive control unit. Under the traction condition, the multi-system converter device conducts dispatching operation like traction through a traction power supply system; under the braking condition, the multi-system converter device enables regenerative braking energy of a traction motor to be stored and reused through power grid feedback.

Description

technical field [0001] The invention relates to rail transit power supply equipment, in particular to a multi-stream system converter device. Background technique [0002] The market for foreign locomotives is vast. With the liberalization of railway freight in countries such as Europe and Africa, many operators use new transit transport connections with the best cost. The locomotives required for this must meet the different requirements of various countries and obtain the approval of these countries. approve. For this reason, the operation department put forward the requirements of standardization, standardization, generalization and serialization of locomotives, and developed a multi-stream system traction converter device suitable for the European market and the African market. The characteristic of this multi-stream system converter device is that it can adapt to The differences in power supply systems between different regions and countries have broad room for develop...

AI Technical Summary

Problems solved by technology

However, this solution adopts a DC drive system, and its performance in all aspects is far inferior to that of an AC drive system. It cannot be compared with an AC drive system and cannot meet the normal operating requirements of various grid voltage systems.

[0006] The current AC drive locomotives, bullet trains and urban rail vehicles can only operate under one grid voltage system, that is, 25kV / 50Hz or DC1500V / 750V. In China, some cities are now trying trunk railways and urban rail railways. The current train traction converters cannot meet the application requirements. However, in countries and regions such as Europe and South Africa, due to historical reasons, the power supply system is relatively complicated, and the existing traction converters cannot meet the multi-voltage requirements. This requires the development of a traction converter device suitable for power supply in multiple voltage systems. This converter device can automatically switch the main circuit and functions under different voltage systems to meet the application of multi-current system vehicles. need

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