Power electronic rectification transformer

Abstract

The invention provides a power electronic rectification transformer. An input is a three-phase or single-phase alternating current, and an output is a direct current. Each phase on the input side is formed by connecting a plurality of same power units in series, so that the requirement of different voltage levels can be met; and the output side is a three-phase or single-phase parallel output of all modules. Each power unit consists of four parts, namely a full control rectification circuit of an input level, a middle inversion circuit, a high-frequency transformer and a non-control rectification circuit of an output level. The power electronic rectification transformer can replace the conventional rectification transformer and the backward stage rectification device, has the characteristics of improving the quality of the power of electric distribution network, along with low cost, and can be widely used in fields of electrochemical electrolysis, traction, transmission, electroplating, charging, excitation, static electricity dust removal and the like.

Description

technical field [0001] The invention relates to a power electronic rectifier transformer, which belongs to the application of power electronics in power systems. Background technique [0002] Rectifier transformers are widely used in electrochemical electrolysis, traction, transmission, electroplating, charging, excitation, electrostatic dust removal and other fields, and are also key equipment in many industrial productions. [0003] The traditional rectifier transformer is the power transformer of the rectifier equipment. The characteristic of the rectifier is that the primary side inputs AC, and the secondary side outputs DC after rectifying the original. Most of the rectified DC power supplies used in industry are obtained from the AC grid through rectifier transformers and rectifier equipment. Since the rectifier transformer winding current is non-sinusoidal and contains many high-order harmonics, in order to reduce the harmonic pollution to the grid and improve the p...

AI Technical Summary

Problems solved by technology

Since the rectification variable winding current is non-sinusoidal and contains many high-order harmonics, in order to reduce the harmonic pollution to the power grid and improve the power factor, the pulse number of the rectification equipment must be increased, and the corresponding rectification transformer design also becomes complicated

If an ordinary rectifier transformer is used, it is necessary to invest in a power quality control device, which increases the cost of the rectifier transformer

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