Control method and control device for matrix converter
A technology of matrix converter and control method, which is applied in the direction of conversion equipment that can be converted to DC without intermediate conversion, can solve the problems of low reliability, short circuit of commutation switching, and large workload, and avoid short circuit of input voltage. , the effect of reducing the number of switches
Active Publication Date: 2012-07-11
SHANGHAI MITSUBISHI ELEVATOR CO LTD
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Problems solved by technology
The commutation times of the output C phase increase, and the b→a→c in the commutation sequence of the output C phase has the following problem: when switching in the interval ISECTOR, the angle θ SC close to 0 or π / 3, the duration of state a may be very short, when the duration is less than the power switch dead time T d , a short circuit will occur during commutation switching
[0019] In order to avoid the above-mentioned short-circuit faults, the matrix converter needs to adjust the commutation sequence in real time according to the relative magnitude of the input voltage, the pulse width, and the input phase to be switched. Such a workload is very heavy and the reliability is not high.
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[0040] When the triangular carrier wave is at the lowest point, if the voltage range switching occurs at this time, and the range changes in increments, such as pressing Trend changes, when switching between intervals, the present invention directly changes the waveform of the triangular carrier wave from the minimum value to the maximum value, and turns the triangular carrier wave into a sawtooth waveform, and the duration is half a triangular carrier cycle Ts. Such as Figure 7 As shown in (a), the interval ISECTOR switches from 1 to 2, the interval VSECTOR remains unchanged at 1, and the waveform of the triangular carrier wave changes directly from the minimum value to the maximum value, then the switch combination sequence within two consecutive Ts becomes: acc→ aca→aaa→aba→abb→bcb→bcc→ccc→acc→aca. At this time, the input phases connected to the output phase A are: a→a→a→a→a→b→b→c→a→a; the input phases connected to the output B phase are: c→c→a→b→ b→c→c→c→c→c; the input...
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The invention discloses a control method for a matrix converter. When voltage intervals are switched, the waveform of a triangular carrier wave is changed to be a sawtooth wave to prevent the input voltage short circuit caused by small pulse. The invention also provides a device for realizing the method, which comprises a driving amplifier circuit, a voltage type four-step commutation unit, a voltage value comparison unit, a matrix transformation switch combined control unit, an input voltage interval and an angle detection unit.
Description
technical field [0001] The invention relates to the field of matrix converter control, in particular to a control method of the matrix converter. The invention also relates to a control device for said matrix converter. Background technique [0002] The matrix converter is a new AC-AC direct converter with excellent input and output characteristics. It does not require large-capacity energy storage components, can make the input current sinusoidal, and the input power factor can theoretically reach ±1, and can be adjusted freely, and has nothing to do with the power factor of the load. The frequency and amplitude of the output voltage are adjustable, and the output frequency can be higher or lower than the input frequency. In particular, its power can flow in both directions, and it has four-quadrant operation capability. [0003] figure 1 It is a typical three-phase matrix converter topology diagram. The three-phase matrix converter consists of nine bidirectional switch...
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IPC IPC(8): H02M5/02
Inventor 刘玉兵牛华荣
Owner SHANGHAI MITSUBISHI ELEVATOR CO LTD