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Modularized H-bridge cascade multilevel mutual-balance power electronic transformer

A technology of power electronics and transformers, applied in the field of transformers, can solve the problem of not having three-phase electric energy automatic mutual balance, etc., and achieve the effect of convenient three-phase independent control, realizing modular production, and reducing the number of components used.

Inactive Publication Date: 2014-07-30
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some current power electronic transformer technologies do not have the ability to automatically balance three-phase electric energy, and need to be controlled separately to solve the problem.

Method used

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  • Modularized H-bridge cascade multilevel mutual-balance power electronic transformer
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  • Modularized H-bridge cascade multilevel mutual-balance power electronic transformer

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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0038] Such as Figure 1-Figure 3 , the present invention provides a modular H-bridge cascaded multi-level mutual balanced power electronic transformer, the power electronic transformer includes an AC / DC rectifier, a DC / AC converter, a high-frequency transformer, and an AC / DC converter , a low-voltage level DC bus parallel module and a DC / AC inverter; the power frequency AC input signal is converted into a first DC voltage signal by the AC / DC rectifier, and the DC / AC converter converts the first DC voltage The signal is modulated into a high-frequency AC square-wave signal, and the high-frequency AC square-wave signal passes through the high-frequency transformer to realize voltage level conversion and electromagnetic isolation, and the AC / DC converter converts the high-frequency AC output from the high-frequency transformer to The square wave signal is conv...

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PUM

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Abstract

The invention provides a modularized H-bridge cascade multilevel mutual-balance power electronic transformer. Power electronic devices are formed on the basis of IGBTs, the power electronic transformer can achieve four-quadrant controlled operation through an effective control strategy, two-way power flow control can be performed, a H-bridge cascade multilevel modularized structure is adopted for a main circuit, large-scale modularized production is facilitated, actual high-voltage class application can be performed, the harmonic content of output voltage is lower, the switching frequency of the power electronic devices is low, loss is lower, and the voltage-sharing problem is avoided. The system structure of the modularized H-bridge cascade multilevel mutual-balance power electronic transformer is in an AC / DC / AC mode, the high-voltage stage, the isolation stage and the low-voltage stage are achieved, and while the voltage transformation function, the isolation function, the energy transmission function and the like of a conventional transformer are completed, the power flow control and the function of control over the quality of electric energy can be completed.

Description

technical field [0001] The invention relates to a transformer, in particular to a modularized H-bridge cascaded multi-level mutual balanced power electronic transformer. Background technique [0002] Power electronic transformer is also called solid-state transformer or flexible transformer. It is a new type of transformer based on power electronic conversion technology and electromagnetic induction technology. It completely changes the system structure of traditional transformers. On the basis of basic functions such as electrical isolation and energy transfer, it can also realize many additional functions such as bidirectional power flow control and power quality control. It is the key equipment for the construction of the next generation of smart grid. The flexible control of the power electronic transformer can be realized by using the fully-controlled composite power electronic device Insulated Gate Bipolar Transistor (IGBT), so that it can operate in four quadrants. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/458H02M7/797
Inventor 段青盛万兴孟晓丽史常凯马春艳
Owner STATE GRID CORP OF CHINA
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