Feedforward control method for intermediate-frequency lower twin-stage matrix converter

A matrix converter and feedforward control technology, which is applied in the direction of converting AC power input into AC power output, output power conversion devices, electrical components, etc. Correction coefficient correction, PWM cycle limit, can not be greatly improved and other issues

Inactive Publication Date: 2011-01-19
BEIHANG UNIV
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Problems solved by technology

However, based on the calculation of 400 Hz to the 50 Hz frequency of the ground power grid, the frequency of the aircraft power supply is increased by about 8 times, and the PWM cycle is limited by the power switching device, so it cannot be greatly increased. In this way, the input voltage in the PWM cycle cannot be considered as a constant value. The calculation time of the duty cycle of the

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  • Feedforward control method for intermediate-frequency lower twin-stage matrix converter
  • Feedforward control method for intermediate-frequency lower twin-stage matrix converter
  • Feedforward control method for intermediate-frequency lower twin-stage matrix converter

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Embodiment Construction

[0040] Such as figure 2 As shown, the dual-stage matrix converter consists of 18 power switches. Six bidirectional switches in the rectification stage form a three-phase rectifier bridge. Usually, each bidirectional switch is composed of two insulated gate bipolar transistors (IGBT) in reverse series. The inverter stage consists of 6 IGBTs to form a three-phase inverter bridge, which is exactly the same as the traditional three-phase inverter bridge topology, and the mature space vector modulation algorithm can be used to control the inverter stage.

[0041] The control of the dual-stage matrix converter in the present invention finally needs to obtain the duty cycle of the rectification stage and the inverter stage, and the duty cycle of the rectification stage switch after eliminating the common mode error before correction is d 1 , the corrected rectifier stage switching duty cycle is d 2 , the duty cycle of the two switches of the inverter stage is d 3 and d 4 .

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Abstract

The invention relates to a feedforward control method for an intermediate-frequency lower twin-stage matrix converter, comprising the following steps: sampling the three-phase input voltage of a twin-stage matrix converter by a sampling circuit, calculating out a rectifier-stage switch duty ratio 1 by a common-mode error elimination method, looking up a table to obtain a three-phase input voltage phase 1 before calibration, carrying out feedforward calibration to obtain a three-phase input voltage phase 2 after calibration, and looking up the table to obtain a rectifier-stage switch duty ratio 2 after calibration; carrying out feedforward calibration according to the three-phase input voltage phase 2 after calibration to obtain a contravariant-stage primary three-phase input voltage corrected phase 3 after calibration and a contravariant-stage secondary three-phase input voltage corrected phase 4 after calibration, looking up the table to obtain a contravariant-stage primary correction factor 1 and a contravariant-stage secondary correction factor 2, and calculating out a contravariant-stage switch duty ratio; and controlling the 18 power switches of the twin-stage matrix converter according to the rectifier-stage switch duty ratio 2 and the contravariant-stage switch duty ratio.

Description

technical field [0001] The invention relates to a feedforward compensation control method for pulse width modulation of a two-stage matrix converter under an intermediate frequency power supply, which is suitable for the control of a two-stage matrix converter under an aviation intermediate frequency power supply. Background technique [0002] The two-stage matrix converter not only has the advantages of conventional matrix converters, such as sinusoidal input current, controllable power factor, compact size (no large capacitors on the DC side with limited working life), and bidirectional energy flow, but also can realize zero-current switching of the rectification stage , to reduce the number of power devices under certain conditions. The above-mentioned advantages of the two-stage matrix converter just meet the high requirements of aviation equipment on volume, weight, life and harmonic quality, and it is an ideal choice for aviation power converters. [0003] The rated f...

Claims

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Application Information

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IPC IPC(8): H02M5/458
Inventor 肖鲲王莉娜
Owner BEIHANG UNIV
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