Three-phase-single-phase power transformation device and rail transit power supply

Abstract

The invention discloses a three-phase-single-phase power transformation device and a rail transit power supply. The three-phase-single-phase power transformation device comprises a phase-shifting transformer and a plurality of power units, a primary side of the phase-shifting transformer is connected to an external power grid, a single phase iron core column of a secondary side of the phase-shifting transformer comprises N secondary side secondary windings with different phases, and electrical angles of the secondary side secondary windings on the single phase iron core column can form an arithmetic progression with a tolerance of 60/N degrees; the secondary side secondary winding is electrically connected with the corresponding power unit; and the output ends of the power units corresponding to the secondary side secondary windings on the single phase iron core column are connected in series. The phase-shifting transformer is utilized, a certain phase difference is manufactured between secondary windings of the secondary side of the phase-shifting transformer, harmonic current generated by operation of power electronic devices in a power unit in a power grid can be eliminated, the total harmonic content of converted voltage and current is far smaller than that required by the national standard, the power factor is high, and the conversion efficiency is high. And the quality of the network side power supply is greatly improved.

Description

technical field [0001] The invention relates to the field of AC power transformation, in particular to a three-phase-single-phase power transformation device and a rail transit power supply. Background technique [0002] With the continuous development of my country's infrastructure construction and the gradual increase in energy use occasions, the power supply system has become more and more complex. In many fields, there is an increasing need for stable three-phase to single-phase power supplies. [0003] However, the three-phase to single-phase power conversion device in the prior art is generally a power conversion device with a transformer as the main body. In the process of converting three-phase to single-phase, there is usually an unbalanced output single-phase voltage, which causes The power factor of the power grid is low, and the total harmonic content of the converted voltage and current is too high. In other words, the conversion quality is poor. [0004] There...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a three-phase-single-phase power conversion device and a rail transit power supply to solve the problem of high harmonic content of the converted voltage and current caused by the unbalanced voltage of the three-phase to single-phase conversion in the prior art, and the poor quality of the power supply The problem

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