A modular multi-level dual-flow traction power supply and purification system

Abstract

A modularized multi-level dual-current traction power supply and purification system comprises an AC power supply system which comprises a traction power supply transformer for providing power to a T base power supply arm and an M base power supply arm; and DC power supply conversion devices, the number of which is two and are corresponding to the T base power supply arm and the M base power supply arm respectively, wherein a first AC-DC unit of each DC power supply conversion device adopts a module cascading structure, realizes high-voltage electricity taking from a contact grid, and converts the electrical power to a multi-level DC power; a DC-AC unit is used for converting a direct current on each direct current capacitor between the first AC-DC unit and the DC-AC unit into an alternating current; an isolation transformer realizes different-level isolation of the alternating currents obtained after conversion through a transformer; a second AC-DC unit is used for converting the AC power into the DC power; and a voltage combination unit is used for combining the DC voltages obtained after conversion. The modularized multi-level dual-current traction power supply and purification system has the advantages of simple structure and principle, high safety and reliability, and easy realization and popularization and the like.

Description

technical field [0001] The present invention mainly relates to the field of traction power supply systems, in particular to a modular multi-level dual-current traction power supply and purification system (Dual-Current Traction Power Supply, DCPY). Background technique [0002] At present, my country's locomotive traction power supply network adopts an AC power supply mechanism, while urban rail uses a DC power supply mechanism, because at present, locomotives and urban rail cannot run together due to the different ways of taking current. In order to make full use of the state-owned infrastructure, it becomes a need to realize that locomotives and urban rail can run on the same line through deployment. At the same time, in order to solve the problem of reactive power in the AC traction power supply network, reactive power compensation devices had to be invested, but now the AC locomotives are put on the line, and they are faced with the problems of large negative sequence cu...

AI Technical Summary

Problems solved by technology

At the same time, in order to solve the reactive power problem in the AC traction power supply network, a reactive power compensation device had to be invested, but now that the AC locomotive is put on the line, it is facing the problem of large negative sequence current and high harmonic content

In addition, because some areas are easy to freeze, especially the passenger dedicated line, it is necessary to use various methods such as machinery to melt the ice of the catenary.

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