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High voltage, large powered convertor in type of transformer with no input/output based on cascade connection

An output transformer and cascade structure technology, applied in the direction of converting irreversible AC power input to DC power output, and converting irreversible DC power input to AC power output, etc., can solve the problem of increasing the size and cost of the converter, increasing the System complexity and other issues to achieve the effect of improving reliability, realizing power inversion, and easy structure and control

Inactive Publication Date: 2007-02-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of output and input transformers increases the size and cost of the converter and increases the complexity of the system

Method used

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  • High voltage, large powered convertor in type of transformer with no input/output based on cascade connection
  • High voltage, large powered convertor in type of transformer with no input/output based on cascade connection
  • High voltage, large powered convertor in type of transformer with no input/output based on cascade connection

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Embodiment Construction

[0017] Such as figure 1 As shown, the converter provided by the present invention can be a single-phase converter or a three-phase converter structurally. The single-phase converter 1 includes an input reactor L1, n rectification-inversion unit modules 2.1, 2.2...2.n and an output reactor L2, where n is the number of cascaded units, n≥1; the input reactor L1 It is connected with the input terminal AC5 of the first-stage rectification-inversion unit module 2.1, the other end of the input reactor L1 is the phase voltage input terminal AC1, the output terminal AC7 of the first-stage rectification-inversion unit module 2.1 is connected with the output reactor L2 connection, the other end of the output reactor L2 is the phase voltage output end AC3, and the input and output ends of the n-level rectification-inverting unit modules 2.1, 2.2...2.n are respectively connected in series in sequence. figure 1 Among them, AC2 is the other input terminal of the phase voltage, AC4 is the ot...

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Abstract

The converter is composed of input reactor, n modules of rectification-inversion unit, and output reactor. The input reactor is connected to the input end of module of rectification-inversion unit at first stage, output end of which is connected to the output reactor. Input, output ends of modules of rectification - inversion unit in n stages are connected in series in sequence. All modules of rectification -inversion unit are composed of full controlled H rectification bridge, DC capacitance, and full controlled H inversion bridge. The DC capacitance is connected to the output end of the H rectification bridge, and the input end of the H inversion bridge in parallel. Features are: no need of input and output transformer, using low voltage part to realize high voltage and large power, implementing bidirectional flow of power with no harmonic wave by using SPWM method to control switch tubes, modularized design and balanced control for each cascaded voltage and power.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a high-voltage high-power converter without input and output transformers based on a cascade structure. Background technique [0002] With the increasing development of power electronics industry, control, computer, etc., the application of power electronic devices in power systems is becoming more and more extensive. Although the advancement of semiconductor technology has greatly improved the withstand voltage level and capacity of switching devices, it is far from enough compared with the requirements of power systems. Therefore, it is very important how to obtain a high-voltage and high-power power electronic conversion device through a switching device with limited withstand voltage and capacity. [0003] Taking high-voltage frequency converter as an example, with the development of electric transmission technology, especially frequency conversion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M7/48
Inventor 毛承雄李国栋陆继明殷幼军王丹项小娟李时华
Owner HUAZHONG UNIV OF SCI & TECH
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