Simplified multi-pulse rectifier based on double-switch power electronic phase-shifting transformer

Abstract

The invention discloses a simplified multi-pulse rectifier based on a double-switch power electronic phase-shifting transformer, and belongs to the technical field of power electronics. The simplifiedmulti-pulse rectifier solves the problem that an existing isolation type phase-shifting transformer is large in size / weight, meanwhile, the pulse number of the rectifier is multiplied in a simple mode, input current harmonic waves are effectively restrained, and continuous adjustment of the output voltage of the rectifier is achieved. The simplified multi-pulse rectifier comprises a first group of rectifier bridges with clamping circuits, a second group of rectifier bridges with clamping circuits, a phase-shifting transformer, a first group of three-phase rectifier bridges, a second group ofthree-phase rectifier bridges, a balance reactor with a secondary winding, a single-phase rectification circuit, a post-stage filter circuit and a control circuit, wherein a turn ratio of a primary side winding to the secondary side winding of the balance reactor with the secondary side winding is 0.246, and at the moment, the balance reactor with the secondary side winding and the single-phase rectification circuit form a pulse multiplication balance reactor which is used for realizing the pulse number multiplication of the rectifier. The simplified multi-pulse rectifier is mainly used for converting three-phase alternating current into direct current.

Description

technical field [0001] The invention belongs to the technical field of power electronics. Background technique [0002] The 12-pulse rectifier has the advantages of simple structure, high reliability, low cost, and low EMI. It is often used in high-power industrial occasions such as urban rail power supply, electrolytic plating, metal smelting, and ship shore power. Although the 12-pulse rectifier can eliminate the 5th, 7th, 17th and 19th harmonics in the input line current, the THD of the input current is still high, and often cannot meet the harmonic standards such as IEEE-519 and IEC-16. Due to the limitation of the structure of the conventional 12-pulse rectifier, the output voltage cannot be adjusted, which limits the further application of the 12-pulse rectifier. In addition, the existing conventional phase-shifting transformers work in the power frequency state. The volume and weight of the phase-shifting transformers are large, and they need to occupy a large instal...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of large volume / weight of the existing isolated phase-shifting transformer, multiply the pulse number of the rectifier in a simple way, effectively suppress the input current harmonics, and realize the continuous adjustment of the output voltage of the rectifier, The invention provides a simplified multi-pulse rectifier based on a double-switch power electronic phase-shifting transformer

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