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Carrier modulation method of two-stage matrix converter

A matrix converter and carrier modulation technology, applied in the direction of converting AC power input to AC power output, output power conversion devices, electrical components, etc., can solve problems such as narrow pulse output waveforms, distortion, etc.

Active Publication Date: 2013-12-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

[0028] The technical problem to be solved by the present invention is to provide a carrier modulation method for a dual-stage matrix converter, which solves the problems of the modulation method in the prior art producing rectification-level narrow pulses and output waveform distortion under unbalanced input conditions

Method used

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  • Carrier modulation method of two-stage matrix converter
  • Carrier modulation method of two-stage matrix converter
  • Carrier modulation method of two-stage matrix converter

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Embodiment approach

[0064] Embodiments of the present invention include the following steps:

[0065] (1) Rectification stage modulation signal and switch signal generation:

[0066] At the initial moment of each sampling modulation cycle, the three-phase input voltage value is detected:

[0067] u in =(u A ,u B ,u C ) T (5.1)

[0068] The two-phase input voltage u in the α-β coordinate system is obtained by Clark transformation iα , u iβ , whose expression is:

[0069] u iα u iβ = 2 3 1 - 1 2 - 1 2 ...

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Abstract

The invention discloses a carrier modulation method of a two-stage matrix converter. The carrier modulation method includes that an application control system samples network voltage, duty ratios of an effective current vector and a zero vector are calculated according to a relative position angle of a rectifier-stage input current space vector, and modulation signals of a rectifier stage are calculated according to the duty ratios of the effective current vector and the zero vector; an equivalent average value of direct-current bus voltage in a modulation period is calculated, and modulation signals of an inverter stage are calculated by combining the duty ratio of the effective current vector and the duty ratio of the zero vector; control signals of a rectifier-stage power switch and an inverter-stage power switch of the two-stage matrix converter are generated according to the modulation signals of the rectifier stage and the inverter stage. Carrier modulation is performed on the basis of the current space vector, so that generation of narrow pulses is inhibited, unbalancing of input voltage is inhibited, modulation process of the two-stage matrix converter is simplified, and the carrier modulation method has good application prospect and practical value.

Description

technical field [0001] The invention belongs to the technical field of AC power conversion devices, and in particular relates to a carrier modulation method of a two-stage matrix converter in the field of three-phase AC frequency conversion. Background technique [0002] The main power circuit topology of the two-stage matrix converter is as follows: figure 1 shown. It is formed by cascading rectification stages composed of 6 groups of bidirectional power switches and inverter stages composed of 6 groups of unidirectional power switches. Among them, SX represents the power switch connecting phase X to the positive pole P of the DC bus, and SX` represents the power switch connecting phase X to the negative pole N of the DC bus. X can be the three phases A, B, and C at the input end, or U, V, W three-phase. The input terminals of the dual-stage matrix converter are A, B, and C, which are generally connected to the three-phase power grid, and the output terminals are U, V, a...

Claims

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Application Information

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IPC IPC(8): H02M5/458
Inventor 黄海涛周波秦显慧刘晓宇雷家兴
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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