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Serially connected 24 pulse rectifier using DC side voltage injection method

A DC side voltage and pulse wave rectification technology, applied in the direction of converting AC power input into DC power output, irreversible AC power input into DC power output, electrical components, etc., to reduce harmonic content, easy to implement, design The effect of simple method

Inactive Publication Date: 2018-10-09
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to improve the harmonic suppression ability of existing high-power rectifiers, and to provide a series-type 24-pulse rectifier using DC side voltage injection method

Method used

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  • Serially connected 24 pulse rectifier using DC side voltage injection method
  • Serially connected 24 pulse rectifier using DC side voltage injection method
  • Serially connected 24 pulse rectifier using DC side voltage injection method

Examples

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Embodiment 1

[0021] Embodiment one: if figure 1 As shown, a series-type 24-pulse rectifier using the DC side voltage injection method involved in this embodiment includes an input inductor, an isolation transformer, a first group of three-phase full-bridge rectifier circuits, a second group of three-phase full-bridge rectifier circuits circuit, output capacitor, load, injection transformer and single-phase full-wave rectification circuit, input inductance and three-phase AC voltage u sa , u sb , u sc Connected in series, the rectifier is equivalent to a current source converter; the input terminal of the isolation transformer is connected to the right side of the input inductor, the primary winding of the isolation transformer is connected in delta, and the two secondary windings of the isolation transformer are connected in delta and star respectively. connection, the two secondary windings of the isolation transformer output two sets of three-phase voltages with a phase difference of 3...

Embodiment 2

[0022] Embodiment two: if figure 1 As shown, in the series-type 24-pulse rectifier using DC side voltage injection method involved in this embodiment, the input inductance includes three inductances L of the same size s , the three inductances and the three-phase AC voltage u sa , u sb , u scConnected in series, the rectifier is equivalent to a current source converter; the output capacitor is composed of two identical large capacitors connected in series, and the load voltage ripple is small, which is equivalent to a constant voltage load.

Embodiment 3

[0023] Embodiment three: as figure 1 and 2 As shown, the present embodiment involves a series-type 24-pulse rectifier using the DC side voltage injection method. The isolation transformer is composed of the first stem, the second stem, and the third stem and has a symmetrical structure. Each There are three windings on the core column, one primary winding and two secondary windings, and the turn ratio of the three windings is Winding a, winding b, and winding c are the primary windings of the isolation transformer, which are connected in a delta connection; winding a1, winding b1, and winding c1 are secondary windings connected in a delta connection; Side winding; winding a, winding a1 and winding a2 are located on the same core column, winding b, winding b1 and winding b2 are located on the same core column, winding c, winding c1 and winding c2 are located on the same core column.

[0024] The isolation transformer consists of three core legs, each with three windings, one...

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Abstract

The invention provides a serially connected 24 pulse rectifier and method using a DC side voltage injection method, and belongs to the technical field of the power electronics. On the basis of the 12pulse rectifier, a harmonic injection circuit is added in the 24 pulse rectifier, the harmonic injection circuit is composed of an injection transformer and a one-phase full-wave rectifying circuit; the primary side of the injection transformer is connected between the midpoints of two groups of three-phase full-bridge rectifying circuits and the midpoint of an output capacitor, the secondary sidecarries a center tap and is connected with the one-phase full-wave rectifying circuit. Since the phase difference between the output currents of two groups of three-phase full-bridge rectifying circuits is 30 DEG; the harmonic injection circuit has two working modes in each power cycle, two modes are analyzed to determine that the turn ratio of the injection transformer is equal to 1.57 when thetotal harmonic distortion rate is minimum. The serially connected 24 pulse rectifier provided by the invention is suitable for the high-voltage large-power rectifying occasion with high electric energy quality requirement.

Description

technical field [0001] The invention relates to a series-type 24-pulse rectifier using a DC side voltage injection method, belonging to the technical field of power electronics. Background technique [0002] In the high-power rectification technology, the uncontrolled multi-pulse rectifier has been widely used because of its simple structure, low difficulty in realization, and strong system robustness. However, due to the strong nonlinearity of the rectifier diode in the rectifier, the problem of harmonic suppression is also prominent. Therefore, how to improve the harmonic suppression capability of the multi-pulse rectifier circuit has become an important topic in the research of power electronics technology. [0003] The 12-pulse rectifier is a rectifier commonly used in high-power applications. Parallel 12-pulse rectifiers have the problem of current imbalance. Although the autotransformer can improve the current unbalance problem to a certain extent, its winding struc...

Claims

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Application Information

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IPC IPC(8): H02M7/10H02M1/14
CPCH02M1/14H02M7/103
Inventor 孟凡刚王琳高蕾孙正鼐
Owner HARBIN INST OF TECH AT WEIHAI
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