Structural device for cascaded type cophase power supply converter

Abstract

The invention relates to a structural device for a cascaded type cophase power supply converter. The device comprises power units which can be connected in series and in parallel, multiple columns of cabinet bodies which are formed by connecting power unit single cabinets and a container for containing the cabinet bodies. According to the structural device for the cascaded type cophase power supply converter, the whole structural design and connections aiming at the power units are optimized in the structural device, and by means of the efficient series-wound and shunt-wound design and the symmetric design of the electrical structure, back-to-back power units are formed, so that the functions of a high-voltage cophase power supply system are achieved in structure, and the technical effects that electrical sectioning is canceled, the safety and the comfort of a train are improved, and damage of an idle current and a harmonic current to the system is reduced are achieved.

Description

technical field [0001] The invention belongs to the technical field of rail transit power electronics, and in particular relates to a converter structure device used in a railway cascaded in-phase power supply system. Background technique [0002] At present, the traction power supply system of my country's electrified railway adopts the power frequency single-phase AC power supply mode. Therefore, compared with the three-phase power system, the electrified railway traction power supply system is a special system with single-phase grounding. Due to the structural asymmetry, the electrified railway traction power supply system has large harmonic content, prominent negative sequence and reactive power. There are three major power quality problems, and the mutual independence and random fluctuation of electric locomotives as single-phase loads make these problems more prominent. In order to improve the power quality of the power system, it is proposed to increase the power sup...

AI Technical Summary

Problems solved by technology

Due to drastic changes in traction and operation, overcompensation of reactive power at light loads and undercompensation of reactive power at heavy loads are caused, resulting in low power factors such as traction power supply

[0004] At present, there is no domestic manufacturer making high-voltage in-phase power supply converter devices with this topology structure. For the previous in-phase power supply converter structure devices on the market, because the internal structure is not welded with angle steel frames, it is used between insulating profiles. Screw connection, the disadvantage of this is that the overall strength is not high. When delivering the goods, the power unit and the cabinet need to be shipped separately. When the site arrives, put the power units into the cabinet one by one, and make various connection lines on site. On-site construction The amount is quite large, and self-test connection is required after completion

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