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Control method for matrix transforming machine and its device

A technology of a matrix converter and a control method, which is applied to the conversion device of output power, the conversion of AC power input to AC power output, electrical components, etc.

Active Publication Date: 2008-05-07
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0015] The object of the present invention is to overcome the deficiencies of the above-mentioned technologies, and propose a control method for matrix converters, which can solve the short-circuit problem caused by inaccurate judgment when the input phase voltage is in the switching interval, and the output voltage waveform and The input current waveform is not affected; the invention also provides a device for realizing the method

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  • Control method for matrix transforming machine and its device
  • Control method for matrix transforming machine and its device
  • Control method for matrix transforming machine and its device

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Embodiment Construction

[0084] The present invention will be further described in detail below in conjunction with the drawings.

[0085] As shown in Figure 6, the control method of the present invention includes the following steps:

[0086] (1) Divide each input phase voltage cycle into 6 main sections and 6 transition sections in the following manner to determine the section of the input phase voltage in each modulation period.

[0087] As shown in Figure 7, it is a division diagram of the input voltage transition section and the main section. According to the input three-phase voltage u a , U b , U c The relative magnitude relationship of the input phase voltage is divided into 12 intervals. The area with a large three-phase voltage difference is defined as the main interval, which is a total of 6 main intervals from I to VI. The relationship of the three-phase voltage in each main section is as follows:

[0088] Main interval I: u a >u c >u b , U P = U a , U M = U c , U N = U b ;

[0089] Main inter...

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Abstract

The present invention which belongs to the matrix converter control technology is a control method for a matrix converter. An input phase voltage is divided into a main range and a transition range in which new P, M, N conditions and PM, NP, MN transition conditions are defined, some null vector is selected and the condition combination sequence of bidirectional power switches are adjusted in each modulation period to realize the safe, reliable and rapid commutation and the stable operation of the matrix converter. The present invention also provides a device to realize the present method, including a trigger driving circuit, an over-current protecting circuit, a synchronous signal detecting circuit, a voltage range dividing unit, a switch state control unit and a commutation control unit. Based on the two-step commutation strategy of the voltage of the transition range and without an extra measuring device to precisely detect the relative size relation of the input phase voltage, the present invention solves the problem of a short circuit caused by an inaccurate measurement of the input phase voltage during range alteration, and the waveforms of the output voltage and the input current are not affected.

Description

Technical field [0001] The invention belongs to matrix converter control technology, and in particular relates to a control method and device for matrix converters. The matrix converter has nine bidirectional power switches arranged in a 3×3 switch matrix form, and the bidirectional power switches are respectively composed of two semiconductor switches connected in reverse series. Background technique [0002] Matrix converter is a direct converter without intermediate loop. By arranging the two-way power switches in the form of a 3×3 switch matrix, each phase of the three output phases of the matrix converter can be connected to one input, and each output phase is connected to three inputs through three two-way power switches. Connected. By controlling each two-way power switch, the given AC input can be directly converted into AC output of different voltages and different frequencies, and a sinusoidal grid current can be obtained. [0003] Figure 1 shows the topology of the thr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/293H02M5/297
Inventor 林桦何必王兴伟佘宏武熊松
Owner HUAZHONG UNIV OF SCI & TECH
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