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Control method of single-phase power electronic transformer

A technology of power electronics and control methods, which is applied in the direction of electrical components, output power conversion devices, AC power input conversion to DC power output, etc., to achieve the effect of reducing structural complexity

Active Publication Date: 2020-06-26
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the technical problem of how to improve the reliability and power conversion efficiency of power electronic transformers

Method used

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  • Control method of single-phase power electronic transformer
  • Control method of single-phase power electronic transformer
  • Control method of single-phase power electronic transformer

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Embodiment Construction

[0047] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention.

[0048] See attached figure 1 , figure 1 The main structure of a single-phase power electronic transformer in this embodiment is shown as an example. Such asfigure 1 As shown, the single-phase power electronic transformer in this embodiment mainly includes a first electric energy conversion circuit, a second electric energy conversion circuit and a high frequency transformer.

[0049] Specifically, the high frequency transformer in this embodiment mainly includes a first high voltage winding, a second high voltage winding and a low voltage winding. The negative terminal of the first high voltage winding ( figure 1 The winding terminal T2 sh...

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Abstract

The invention relates to the technical field of power electronics, in particular to a single-phase power electronic transformer and a control method thereof, aiming at solving the technical problem ofhow to improve the reliability and the electric energy conversion efficiency of the power electronic transformer. For this purpose, in the single-phase power electronic transformer provided by the invention, a first converter circuit is respectively connected with a first high-voltage winding and a single-phase high-voltage alternating current power supply, a second converter circuit is respectively connected with a second high-voltage winding and a single-phase high-voltage alternating current power supply, and a second electric energy conversion circuit is connected with a low-voltage winding. Based on the above structure, the output voltage of the first converter circuit and the second converter circuit is controlled by using the AC output voltage reference value of the high-frequencysquare wave signal with opposite voltage polarity at any time, so that the current of the single-phase high-voltage AC power supply is a low-frequency sinusoidal current, and the harmonic content is low. At the same time, because the high-voltage winding side of the high-frequency transformer is continuously subjected to the high-frequency square-wave voltage, the high-voltage side and the low-voltage side of the single-phase power electronic transformer can be electrically isolated by the high-frequency transformer.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a control method for a single-phase power electronic transformer. Background technique [0002] Power electronic transformer (power electronic transformer, PET) is a new type of intelligence that combines power electronic conversion technology and power conversion technology based on the principle of electromagnetic induction to transform the power of one power characteristic into the power of another power characteristic. transformer. Compared with traditional industrial frequency transformers, power electronic transformers not only have multiple functions such as reactive power compensation, harmonic compensation and electrical isolation, but also can provide DC ports of different voltage levels to meet the requirements of DC power grids or AC-DC hybrid power grids. equipment needs. [0003] Currently, power electronic transformers suitable for voltage levels above ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217H02M5/12
CPCH02M5/12H02M7/217
Inventor 李子欣李耀华高范强徐飞赵聪王平
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI