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Cascaded power module redundancy fault-tolerant control method of power electronic transformer

A power module and power electronics technology, applied in the direction of adjusting electrical variables, control/regulating systems, output power conversion devices, etc., can solve problems such as complex control, and achieve simplified control algorithms, automatic voltage equalization, and smooth and fast switching process. Effect

Active Publication Date: 2018-01-05
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of complex redundant fault-tolerant operation control of the existing power electronic transformer cascaded power modules, and propose a redundant fault-tolerant control method for power electronic transformer cascaded power modules

Method used

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  • Cascaded power module redundancy fault-tolerant control method of power electronic transformer
  • Cascaded power module redundancy fault-tolerant control method of power electronic transformer
  • Cascaded power module redundancy fault-tolerant control method of power electronic transformer

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Embodiment Construction

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

[0022] Such as figure 1 As shown, the power electronic transformer single-phase circuit is taken as an example for illustration. The single-phase circuit of the power electronic transformer is formed by cascading N+m power modules, and the single-phase circuit can operate independently. Among them, N and m are both positive integers, N is the number of series-connected power modules required by the power electronic transformer without redundant modules, and m is the number of redundant power modules. Each power module includes an H bridge unit, a dual active bridge series resonant DC-DC converter, a bypass switch and a breaking switch. The dual active bridge series resonant DC-DC converter adopts an open-loop square wave voltage output control. In the manner that the DC energy storage capacitors on the secondary side are connected in paralle...

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Abstract

The invention discloses a cascaded power module redundancy fault-tolerant control method of a power electronic transformer. The method is suitable for a cascaded H bridge type power electronic transformer; when the cascaded power module is in fault, the fault power module is bypassed under the situation that the fault-tolerant running condition is satisfied, and a switch device trigger signal of the fault power module is redistributed to a redundancy module, so that the power electronic transformer is smooth in redundancy switching, and the non-intermittent and accuracy of the redundancy switching are realized.

Description

technical field [0001] The invention relates to a redundant fault-tolerant control method for power electronic transformer cascaded power modules. Background technique [0002] In addition to the voltage level conversion and electrical isolation functions of traditional transformers, power electronic transformers also have multiple functions such as power flow bidirectional control, power quality control, device self-protection and self-diagnosis, communication and information exchange, and have different voltage levels. AC and DC ports, suitable for flexible access to various types of distributed energy, energy storage and loads, and interconnection of AC / DC grids. It plays an irreplaceable important role in smart grid, energy Internet and future AC-DC interconnection grid, and is the core device for realizing power conversion and processing. [0003] As a kind of flexible power equipment used in power distribution system, the reliability of power electronic transformer eq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J9/06H02M3/338H02M3/335
Inventor 高范强李耀华李子欣王平徐飞马逊
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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