A control method for ac-dc series resonant matrix converter

A matrix converter, AC-DC technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of complex modulation algorithm, large amount of calculation, and inapplicability

Active Publication Date: 2016-04-13
SOUTHWEST JIAOTONG UNIV +3
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • A control method for ac-dc series resonant matrix converter
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  • A control method for ac-dc series resonant matrix converter

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Embodiment

[0135] Taking the control device directly obtained according to the control method of the present invention as an example, the application mode of the present invention is further described, as follows: Figure 7 As shown, this example includes a series resonant circuit, a three-phase power supply 2, a filter 3, a switch matrix 1, a series resonant circuit, a high-frequency transformer, a silicon stack 17, and an output filter circuit 18; the control system is composed of a signal filter 4, an overpass Zero comparison circuit 5, grid voltage detection circuit 15, grid fault detection circuit 12, load voltage acquisition circuit 11, switch matrix drive circuit 16, overcurrent detection circuit 13, overtemperature detection circuit 14 and a controller with FPGA as the control core 6-10; inside the controller is composed of a phase detection unit 6 , a switch selection module 7 , a sequence generation unit 8 , a control parameter calculation unit 9 and a closed-loop control unit 1...

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Abstract

The invention relates to a matrix converter control technology and a high-frequency alternating-current link technology, in particular to a control method for an AC-DC series resonance matrix converter used for a high-voltage direct-current load. According to the method, in half a period of high-frequency currents, the control strategy that the excitation voltage is used for being switched into the low-line voltage from the high-line voltage and then switched into the 0 voltage is adopted, instantaneous composition of the three voltages is achieved, adjusting of the equivalent excitation voltage is achieved, meanwhile, the average value of each phase of input line currents is proportional to the phase voltage, and the high power factors and the low-harmonic currents are achieved as long as the small filter inductance value is needed. The control method has the advantage that control over the voltage-stabilized-output AC-DC series resonance matrix converter with the features of high efficiency, the high power factors and the low-harmonic low-peak currents can be achieved.

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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/12
Inventor 李伟刘庆想张政权
Owner SOUTHWEST JIAOTONG UNIV
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