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

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...

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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 PWM rectification stage and the correction coefficient of the inverter stage are corrected so that the dual-stage matrix converter can be applied to the intermediate frequency of the aircraft.

[0004] At present, there is no literature report on the correction of the calculation time of the duty cycle of the PWM rectifier stage and the correction coefficient of the inverter stage at home and abroad.

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