Fault tolerance design-based high-power power electronic transformer

A technology of power electronics and fault-tolerant design, which is applied in the direction of converting DC power input to DC power output, converting AC power input to AC power output, and adjusting electrical variables. It can solve problems such as fault tolerance and reliability are not very ideal, and achieve Improve the electrical environment of the power grid, solve the voltage sag/swell, and suppress the effects of harmonics

Inactive Publication Date: 2011-05-25
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current PET has not yet adopted a modular design, and its fault tolerance and reliability are not very ideal.

Method used

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  • Fault tolerance design-based high-power power electronic transformer
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  • Fault tolerance design-based high-power power electronic transformer

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 Shown is a structural diagram of a high-power power electronic transformer based on fault-tolerant design. Its three-phase structure is the same and independent, connected in a three-phase star structure, and connected in parallel after using a three-phase four-wire system output; each A three-stage structure is adopted on a single phase, that is, a high-voltage input stage, an isolation stage and a low-voltage output stage.

[0023] The high-voltage input module and the corresponding isolation module form an input module, and more than one input module and one low-voltage output module are connected to each single phase of the power electronic transformer, and the primary side of the input module is a high-voltage input module A circuit composed of the primary side circuit of the corresponding isolation module, the secondary side of the input ...

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Abstract

The invention discloses a fault tolerance design-based high-power power electronic transformer. The input end of the power electronic transformer adopts a three-phase star structure for access; each single phase of the input end of the power electronic transformer is connected with the input end of a high-voltage input module, the output end of the high-voltage input module is connected with the primary circuit of an insulation module corresponding to the high-voltage input module, and the secondary circuit of the isolation module is connected with the input end of a low-voltage output modulein the single phase; and the output ends of the low-voltage output modules in the single phases adopt three-phase four-wire output and are connected in parallel to be led out as the output end of thepower electronic transformer. The fault tolerance design-based high-power power electronic transformer can replace the conventional power electronic transformer to realize voltage transformation, energy transmission and electrical isolation, and can stabilize output voltage and solve voltage quality problems of wires, such as voltage dip, voltage rise, voltage flicker, overvoltage, undervoltage and the like, through corresponding control policies.

Description

technical field [0001] The invention relates to a power system, in particular to a high-power power electronic transformer based on fault-tolerant design. Background technique [0002] Transformer is an important basic component in power system distribution network. It is cheap, can run reliably for a long time, and has high efficiency in transmitting electric energy; but it also has many shortcomings, such as its large size, relatively heavy, and It is sensitive to harmonic pollution in the power grid and fluctuations in the load side, and lacks flexible automatic adjustment capabilities; in addition, the insulating oil in the transformer may also cause environmental pollution problems. [0003] For this reason, the concept of power electronic transformer (Power electronic transformer, referred to as PET) was proposed in the 1970s. PET uses power electronic commutation technology to realize voltage conversion and energy transfer; its outstanding feature is through the volta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/45H02M3/315
Inventor 赵剑锋季振东翟广平蒋本洲冯祖康于鹏孙毅超王梦蔚李修飞
Owner SOUTHEAST UNIV
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