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Module combined multi-level converter

A combined, multi-level technology, applied in the field of multi-level conversion, can solve problems such as bulky volume and inability to achieve negative sequence current compensation, and achieve the effect of overcoming limitations

Inactive Publication Date: 2009-09-30
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the traditional cascaded multilevel converter is used in the AC-DC-AC power conversion system, the AC input side must use a bulky and complex multi-winding phase-shifting power frequency transformer, and it is used in the field of power quality improvement. Unable to realize negative sequence current compensation function

Method used

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  • Module combined multi-level converter

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Embodiment Construction

[0023] Embodiments of the present invention will be further described in conjunction with the accompanying drawings:

[0024] figure 1 It is a structural schematic diagram of a k-level three-phase module combined multilevel converter of the present invention, and the number of power units is n=k-2. The first AC connection terminal 11 of the first power unit U1 is sequentially connected in series with n third power units U 3 Constitutes the upper bridge arm of phase A, the second power unit U 2 The first AC connection terminal 21 of the n fourth power unit U is connected in series in sequence 4 The lower bridge arm of phase A is formed, the upper bridge arm of phase A and the lower bridge arm of phase A are connected through the first reactor 1 and the second reactor 2, and the connection between the first reactor 1 and the second reactor 2 The connection point is the AC output terminal U of the bridge arm of phase A; the first power unit U 1 The second AC connection termin...

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Abstract

The invention discloses a module combined multi-level converter, and belongs to the technical field of multi-level conversion. Three-phase alternating current wire connecting terminals of a first power unit (U1) are connected in series with n third power units (U3) (n is a positive integer, same below) in turn to form a three-phase upper bridge arm, three-phase alternating current wire connecting terminals of a second power unit (U2) are connected in series with n fourth power units (U4) in turn to form a three-phase lower bridge arm, the three-phase upper bridge arm is connected with the three-phase lower bridge arm through two electric reactors, and a connecting point between the two electric reactors is a three-phase alternating current output end. A direct current wire connecting terminal of the first power unit (U1) is connected with an anode (101) of a direct current bus, and a direct current wire connecting terminal of the second power unit (U2) is connected with a cathode (102) of the direct current bus. By increasing or reducing the number n of the power units of the upper bridge arm and the lower bridge arm, the level number of the converter can be changed. The module combined multi-level converter preserves the advantages of the conventional multi-level converter, overcomes the defects of the conventional multi-level converter, and can be applied to an energy conversion system of medium-high voltage high-power occasions.

Description

technical field [0001] The invention relates to a multilevel conversion technology, in particular to a module combined multilevel converter capable of realizing power conversion, rectification and inversion. Background technique [0002] Two-level converter circuits are widely used in various fields such as railways and industrial production. However, in high-voltage applications, due to the limitation of device withstand voltage, the common method is to connect to high-voltage power grids or loads through power frequency transformers, which is heavy and heavy. The commercial frequency transformer greatly increases the cost and volume of the power electronic conversion device, and limits the efficiency of the system. [0003] In recent years, the application of multilevel converters in high-voltage and high-power applications has received widespread attention. Compared with ordinary two-level circuits, multilevel converters have the following advantages: [0004] (1) The vo...

Claims

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Application Information

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IPC IPC(8): H02M7/42H02M7/515
Inventor 郑琼林杨晓峰贺明智游小杰林飞郝瑞祥黄先进孙湖张立伟王琛琛杨中平
Owner BEIJING JIAOTONG UNIV
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