Control method and apparatus of AC-DC series resonance matrix converter

Abstract

The invention relates to the matrix converter control technology and the high-frequency alternating-current link technology, particularly to a control method and apparatus of an AC-DC series resonance matrix converter for a high-voltage direct-current load. According to the method, a control strategy of switching of an excitation voltage from a low-wire voltage to a high-wire voltage and then to 0 voltage is used in the half period of a high-frequency current, thereby realizing three-voltage instantaneous composition; and thus the equivalent excitation voltage adjustment is realized and the average value of each phase of input wire current is in direct proportion to a phase voltage, and a high power fact and a low harmonic current are realized only by a small filtering inductance value. The provided method and the apparatus have the following beneficial effect: voltage-stabilizing outputting-based AC-DC series resonance matrix converter controlling with characteristics of high efficiency, high power factor, and low-harmonic and low-peak value current. And the method and the apparatus is especially suitable for the AC-DC series resonance matrix converter.

Description

technical field [0001] The invention relates to matrix converter control technology and high-frequency AC connection technology, in particular to a control method and device for an AC-DC series resonant matrix converter for high-voltage direct current loads. Background technique [0002] High voltage DC power supplies are widely used in continuous wave and long pulse modulator high power microwave systems. In order to meet the military needs of future high-tech warfare, high-power microwave systems are developing in the direction of high power, miniaturization, and light weight, which requires their power supplies to have higher power density, efficiency, and power factor. At present, the commonly used power supply generally adopts DC-Link technology with an intermediate DC energy storage link. The existence of the intermediate energy storage link will inevitably increase the volume and weight of the power supply system and reduce the power density of the power supply; in ad...

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Problems solved by technology

These modulation algorithms are relatively complex, with a large amount of calculation, and more importantly, they cannot be applied to high-frequency (tens of kHz) output occasions.

The current commutation strategies of matrix converters are mainly divided into voltage-type and current-type commutation strategies. In order to achieve reliable commutation input, a large inductance must be connected in series to prevent input short-circuit, and a clamp circuit must be used to prevent output from being open. These methods also Unsuitable for current topological circuits operating at high frequencies

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