A Topological Structure of Vehicle-mounted Non-industrial Frequency Power Electronic Transformer

Abstract

A topology structure of a vehicle-mounted power electronic transformer, which is composed of three stages, that is, an input rectification stage, an intermediate frequency isolation stage, and an output stage; the input rectification stage adopts a bridge topology, and the intermediate frequency isolation stage is two bridge circuits connected in series Topological structure, the three-winding transformer used by the isolation transformer; the output stage uses a topology in which each module supplies power to the load independently; it can effectively reduce the volume and weight of the vehicle-mounted transformer, improve the efficiency of power transmission, and pass through the secondary side of the transformer The flexible adjustment of voltage, primary current and power can realize unit power factor operation on the grid side.

Description

technical field [0001] The invention relates to a topological structure of a power electronic transformer applied to an electric locomotive, and belongs to the application of the power electronic technology in the electric traction system. Background technique [0002] Since the traditional power transformer was invented, due to its simple manufacturing process and high reliability, it has become the basic component equipment of the power transmission and distribution system, and the number is huge. The locomotive on-board power frequency transformer is one of its application fields; but its shortcomings are also obvious. , the volume and weight are relatively large, the transformer insulating oil will bring environmental problems, and it is not easy to maintain; due to the nonlinear characteristics of ferromagnetic components, when the transformer core is magnetically saturated, it will cause the waveform distortion of the voltage and current in the system and generate harmo...

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Problems solved by technology

[0002] Since the traditional power transformer was invented, due to its simple manufacturing process and high reliability, it has become the basic component equipment of the power transmission and distribution system, and the number is huge. The locomotive on-board power frequency transformer is one of its application fields; but its shortcomings are also obvious. , the volume and weight are relatively large, the transformer insulating oil will bring environmental problems, and it is not easy to maintain; due to the nonlinear characteristics of ferromagnetic components, when the transformer core is magnetically saturated, it will cause the waveform distortion of the voltage and current in the system and generate harmonics Pollution; the voltage on the secondary side of the transformer cannot be kept constant, and when a fault occurs on the load side, the fault cannot be isolated, which leads to the expansion of the fault

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