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A Hybrid Commutation Method Applicable to the Rectification Stage of Two-Stage Matrix Converter

A technology of matrix converter and rectification stage, which is applied in the direction of conversion equipment for intermediate conversion to DC conversion, can solve problems such as failure, achieve safe and reliable commutation, eliminate overcurrent/voltage peaks, excellent grid-side performance and transmission performance effect

Inactive Publication Date: 2017-01-11
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a hybrid commutation method suitable for the rectification stage of a two-stage matrix converter, which can effectively solve the problem of commutation failure, thereby eliminating overcurrent / voltage spikes and improving system reliability

Method used

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  • A Hybrid Commutation Method Applicable to the Rectification Stage of Two-Stage Matrix Converter
  • A Hybrid Commutation Method Applicable to the Rectification Stage of Two-Stage Matrix Converter
  • A Hybrid Commutation Method Applicable to the Rectification Stage of Two-Stage Matrix Converter

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Embodiment Construction

[0030] The present invention will be described in detail below in combination with specific implementation methods and accompanying drawings.

[0031] The hybrid commutation method is suitable for the rectification stage of the two-stage matrix converter. The modulation strategy of the rectification stage adopts the X-type sector division method, which divides a period into 6 sectors (Ⅰ), and then uses the amplitude of each sector The boundary where the two-phase voltages of the same polarity are equal is subdivided into 2 sectors (II), which are divided into 12 sectors in total; judge whether the pulse generated by modulation is greater than the four-step commutation time, if greater, it is a wide pulse, otherwise it is For narrow pulses (Ⅲ), four-step commutation (IV) is implemented at wide pulses, and zero-current commutation (Ⅴ) is used at narrow pulses, specifically as Figure 4 shown.

[0032] The four-step commutation at the wide pulse includes three situations: the hi...

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Abstract

The invention discloses a mixing type current converting method suitable for a two-stage matrix converter rectification stage. An X-type sector dividing method is adopted in the rectification stage modulation strategy, one period is divided into six sectors, each sector is subdivided into two sectors with the position where two-phase voltages have the same amplitude and polarity as a boundary, and totally twelve sectors are formed; whether a pulse generated in a modulation mode is larger than four-step current converting time or not is judged, if yes, the pulse is a broad pulse, and if not, the pulse is a narrow pulse, four-step current converting is carried out on the wide pulse, and zero-current conversion is adopted on the narrow pulse; a simple zero-current converting method for adjusting inversion stage modulation waves according to the rectification stage switch duty ratio is also provided. According to the method, over-current / over-voltage peak caused by conversion failure is effectively eliminated while the superior network side performance and the superior transmission performance are achieved, safe and reliable current conversion is achieved, system reliability is improved, and a basis is provided for further engineering application of a two-stage matrix converter.

Description

technical field [0001] The invention belongs to the technical field of power electronics and relates to a hybrid commutation method suitable for the rectification stage of a double-stage matrix converter. Background technique [0002] With the rapid development of microelectronics technology and power electronics technology, various power electronic converters have been more and more widely used in the construction of the national economy. Most of these power converters use uncontrollable diode rectifiers with energy storage capacitors. The mature promotion of this kind of converter has brought considerable benefits but also brought negative effects such as harmonic pollution, low power factor, and short life of DC filter capacitors. Therefore, the development of "green" converters has become the focus of research by many experts and scholars. [0003] "Green" converters should have the following characteristics: sinusoidal input and output characteristics; controllable inp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/44
Inventor 宋卫章贺瑾钟彦儒汪丽娟
Owner XIAN UNIV OF TECH
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