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Three-phase three-level rectifier based on three-winding isolation transformers

An isolation transformer and three-level rectification technology, which is applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as complex control, achieve zero-crossing distortion, and reduce the number of diodes , The effect of loss reduction

Active Publication Date: 2021-02-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the existing three-switch Sepic type three-phase three-level rectifier structure and complex control problems, the present invention provides a three-phase three-level rectifier based on a three-winding isolation transformer with simple structure and easy control

Method used

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  • Three-phase three-level rectifier based on three-winding isolation transformers
  • Three-phase three-level rectifier based on three-winding isolation transformers
  • Three-phase three-level rectifier based on three-winding isolation transformers

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: a three-phase three-level rectifier of a three-phase four-wire system, such as figure 1 shown, including three input filter inductors L a1 , L a2 , L a3 , three energy storage capacitors C 1 、C 2 、C 3 , Three three-winding isolation transformers T 1 , T 2 , T 3 , three sets of bidirectional switches (the first set of S a1 , S a2 ;Second group S b1 , S b2 ; The third group S c1 , S c2 ), six power diodes and two output filter capacitors C o1 、C o2 ;

[0021] Each phase of the input power supply is connected in series with an input filter inductor and a group of bidirectional switches in sequence, the ends of the three groups of bidirectional switches are connected together, the connection point is point O, and the neutral line of the three-phase input power supply is connected to point O;

[0022] Each energy storage capacitor is connected in series with the primary winding of a three-winding isolation transformer, and connected in parallel ...

Embodiment 2

[0048] Embodiment 2: a three-phase three-level rectifier of a three-phase three-wire system, such as figure 2 shown, including three input filter inductors L a1 , L a2 , L a3 , three energy storage capacitors C 1 、C 2 、C 3 , Three three-winding isolation transformers T 1 , T 2 , T 3 , three sets of bidirectional switches (the first set of S a1 , S a2 ;Second group S b1 , S b2 ; The third group S c1 , S c2 ), six power diodes and two output filter capacitors C o1 、C o2 ;

[0049] Each phase of the input power supply is respectively connected in series with an input filter inductor and a group of bidirectional switches, and the ends of the three groups of bidirectional switches are connected together;

[0050] Each energy storage capacitor is connected in series with the primary winding of a three-winding isolation transformer, and connected in parallel with a group of bidirectional switches after being connected in series;

[0051] The secondary side of each t...

Embodiment 3

[0141]Embodiment 3: This embodiment is a circuit diagram of a three-phase three-level rectifier based on a three-winding isolation transformer based on an improved three-phase three-wire system based on embodiment 2, as shown in Figure 12 shown.

[0142] Taking the single-phase model as an example, such as Figure 13 As shown, the influence of the coupled inductance on the circuit will be analyzed in detail. Due to the three-phase power balance, for each phase, its load resistance is 3R L , that is, the output current is i o / 3. L a1 and L b1 The self-inductance of the coupled inductors are L 1 , L 2 , the mutual inductance is M(L 1 >M,L 2 >M). Considering that there is a freewheeling phase on the input side in each switching cycle, the energy storage capacitor voltage u C1 vs. input voltage e A equal, i.e. u C1 =e A . The extremely small excitation current of the transformer is ignored in the analysis.

[0143] bi-directional switch (S a1 , S a2 ) is turned...

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Abstract

The invention discloses a three-phase three-level rectifier based on three-winding isolation transformers, aims to solve the problems of complexity of the structure and control of an existing three-switch Sepic type three-phase three-level rectifier, and belongs to the field of three-level rectifier topology. The three-phase three-level rectifier based on the three-winding isolation transformers of the invention is applied to an aviation power supply and comprises three input filter inductors a, three energy storage capacitors, three three-winding isolation transformers, three groups of bidirectional switches, six power diodes and two output filter capacitors. According to the three-phase three-level rectifier of the invention, a better power factor correction effect function can be realized by means of a simple circuit structure and control, the output lower limit of the output voltage is effectively reduced, and the introduction of the three-winding isolation transformer effectivelyreduces the voltage stress of a switching tube in the circuit. When the input current crosses zero, the problem of reverse sudden change of the current does not exist; meanwhile, when the input voltage crosses zero, the voltages at the two ends of each energy storage capacitor are negative, and even if the input voltage does not exceed the voltage of the energy storage capacitors, charging of theinput filter inductors is not affected.

Description

technical field [0001] The invention relates to a novel three-phase three-level rectifier based on a three-winding isolation transformer, belonging to the field of three-level rectifier topology. Background technique [0002] Multilevel rectifiers show excellent application prospects due to their advantages such as less current harmonic content and lower voltage stress on switching devices. Among them, the VIENNA rectifier, as a relatively typical three-level topology, has a simple circuit structure and has been widely used in the field of high-voltage, high-power power factor correction. [0003] In order to ensure the normal operation of the VIENNA rectifier, its output voltage is required to be greater than twice the maximum input voltage, so that the VIENNA rectifier can be used in occasions where the output voltage adjustment range is wide (such as aviation power supply with three-phase input of 115V / 400Hz and output of 270V constant voltage) Voltage level requirements...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor 丁明远贲洪奇孙凯赵志强
Owner HARBIN INST OF TECH
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