Brake chopper power unit

Abstract

The present invention is a novel brake chopper power unit, including a radiator, a composite busbar and a brake chopper main circuit. The power unit adopts a laminated modular design. Each power device in the circuit is installed on the surface of the radiator, and each power device connects all components of the brake chopper main circuit through a composite busbar and inputs and outputs externally. The invention adopts a simplified main circuit and a convenient and flexible circuit connection technology to unify the components and facilitate the expansion of the power unit; adopts a modular design of a stacked structure, saves space, facilitates maintenance and replacement, and reduces maintenance costs; The main circuit electrical technology reduces the stray inductance of the main circuit loop, improves the reliability of the main circuit, and completely avoids the difficulty of detouring cables in a narrow space. The structure is compact, the volume is reduced, and the design cost is reduced.

Description

Technical field [0001] The invention relates to the field of electrical technology, in particular to a new type of braking chopper power unit. Background technique [0002] The main function of the subway traction system is to take power from the intermediate DC loop, and after inverting through the three-phase circuit composed of IGBTs on the traction inverter power unit, it supplies power to the train's traction motor, drives the subway vehicle to run, and at the same time uses braking and chopping The power unit solves the problem that the intermediate voltage is too high during the braking process or when the grid voltage fluctuates, which damages the IGBT devices. The subway traction system is the core of subway vehicles and the source of power for subway vehicles. Since the running time between subway stations is only a few minutes, this requires the entire subway traction system to respond quickly, start and stop quickly, and be stable. , Which puts forward higher require...

AI Technical Summary

Problems solved by technology

The disadvantages of this technology are: 1) the structure of the power circuit is complicated, and it is not conducive to maintenance and replacement when the power circuit fails; Low; the entire main circuit structure is bloated, the electrical clearance distance is required to be large, and the space occupied is large; 3) When the power increases, it is difficult or impossible to expand capacity

The main disadvantage of this technology is: although two sets of main circuits are installed on the same radiator, it does not adopt a completely simplified design, which is not convenient for replacement and storage of components, and the cost of the product is relatively high

The disadvantages of this technology are: the braking power unit and the chopper power unit work independently, occupy a large volume on the limited locomotive or subway space, are not easy to install, and the design cost is high

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