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: 2009-09-02
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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[0084] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0085] Such as Figure 6 Shown, control method of the present invention comprises the following steps:
[0086] (1) Divide each input phase voltage cycle into 6 main intervals and 6 transition intervals in the following manner, so as to determine the interval of the input phase voltage in each modulation cycle.
[0087] Such as Figure 7 Shown is the division diagram of the input voltage transition range and the main range. According to the input three-phase voltage u a , u b , u c The relative size relationship of the input phase voltage is divided into 12 intervals. The area with large three-phase voltage difference is defined as the main interval, and there are 6 main intervals from I to VI. The relationship of the three-phase voltages 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 ...
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The invention belongs to the matrix converter control technology, and is a control method for the matrix converter. By dividing the input phase voltage into a main interval and a transition interval, new P, M, N states and PM, NP are defined in the transition interval. , MN transient state and select a specific zero vector in each modulation cycle and adjust the combination sequence of bidirectional power switch states to realize safe, reliable, fast commutation and stable operation of the matrix converter. The invention also provides a device for realizing the method, which includes a trigger drive circuit, an overcurrent protection circuit, a synchronous signal detection circuit, a voltage interval division unit, a switch state control unit and a commutation control unit. The present invention is based on the voltage-type two-step commutation strategy in the transition interval, and does not need to add a special measurement device that accurately detects the relative magnitude relationship of the input phase voltage, and solves the problem of short circuit caused by inaccurate measurement of the input phase voltage during the transition interval, and The output voltage waveform and input current waveform are not affected.
Description
technical field [0001] The invention belongs to the matrix converter control technology, in particular to a control method and device for the matrix converter. The matrix converter has nine bidirectional power switches arranged in the form of a 3*3 switch matrix, and the bidirectional power switches are respectively composed of two semiconductor switches in reverse series. Background technique [0002] A matrix converter is a direct converter without an intermediate loop. By arranging the bidirectional power switches in the form of a 3×3 switch matrix, each of the three output phases of the matrix converter can be connected to an input, and each output phase can be connected to three inputs through three bidirectional power switches. connected. By controlling each bidirectional power switch, a given AC input can be directly converted into AC outputs of different voltages and frequencies, and a sinusoidal grid current can be obtained. [0003] figure 1 The topology diagra...
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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