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A Realization Method of Precise Phase Shifting Based on Multi-module Cascaded Matrix Converter
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A matrix converter, multi-module technology, applied in the direction of converting AC power input into AC power output, output power conversion devices, electrical components, etc., can solve the problem of large current fluctuations, the average output voltage cannot be guaranteed, and the output quality and other issues, to achieve the effect of improving output quality, enhancing safety, and ensuring safe commutation
Active Publication Date: 2020-04-10
CENT SOUTH UNIV
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However, the conventional approximate phase-shifting method only shifts the phases of the PWM waveforms of each module bluntly, so that the average value of the output voltage of each module cannot be guaranteed to be equal. If it is added to a small resistor or a control motor, it will cause large current fluctuations. output quality cannot be guaranteed
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example 1
[0067] image 3 It is a comparative schematic diagram of a phase shifting method in a specific embodiment of the present invention, as image 3 as shown, image 3 (a) is the basic waveform before phase shifting, image 3 (b) is the current conventional approximate phase shifting method, image 3 (c) is the phase shifting method that the present invention proposes, image 3 (b) with image 3 (c) both image 3 The base waveform in (a) is phase shifted by T / 4.
[0068] During system operation, the duty cycle of the controller (that is, the switch conduction time) will change to meet the requirements of the output voltage. But in the same period, the duty cycle of each module is the same, so that each module outputs the same expected voltage value. Assuming a period of time T=200, n is calculated to be approximately 1.2053. The switch conduction time of the first switch control period is 2t=80, the switch conduction time of the second switch control period is 2t=100, and t...
example 2
[0072] The switching device used in this example is an IGBT, and the switching time of the IGBT is t p =1.5us, switch control cycle T=250us, the count value N of one switch control cycle of the controller c =18750, n=113 (5n=565, 11n=1243) can be obtained from the above calculation.
[0073] Figure 4 It is a schematic diagram of the driving voltage waveform when the phase shift is 0 in a specific embodiment of the present invention, as can be seen from the figure,
[0074] t1=t, 565≤t1≤8923
[0075] t2=18750-t, 9827≤t2≤18185
[0076] also, Figure 4 In (a), 0 Figure 4 In (b), T / 4
[0077] Figure 5 It is a schematic diagram of the driving voltage waveform when the phase shift of the specific embodiment of the present invention is T / 4, refer to Figure 5 , applying the phase-shifting method described above, Figure 5 (a) It can be divided into two situations for discussion:
[0078] ① Hours (565≤t≤3445)
[0079]
[0080]
[0081] ② Hours (3445≤t≤4123...
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Abstract
The present invention provides a method for realizing precise phase shifting based on a multi-module cascaded matrix converter, including: S1, calculating any switch control cycle of the i-th module according to the switching waveform after the phase-shifting of the i-th module of the converter The first action time t1 of the inner switch and the second action time t2 of the switch; i=1,2,...,N, N is the number of modules of the converter; S2, if t1 and t2 do not meet the safe commutation rules, according to the safe commutation The rules adjust t1 and t2; the safe commutation rules are used to ensure that the i-th module can achieve safe commutation and have the same duty cycle as other modules in any switching control period; S3, repeat S1 and S2, and obtain the i-th module’s t1 and t2 of all switching control cycles; S4, repeating S1 to S3 to obtain t1 and t2 of all switching control cycles of all modules to perform phase-shift control on the converter. The method provided by the invention improves the output quality and enhances the safety of operation.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a method for realizing precise phase shifting based on multi-module cascaded matrix converters. Background technique [0002] At present, it has become the focus of people's attention to pay attention to energy saving and emission reduction, and effectively reduce the energy consumption of enterprises. The application of medium / high-voltage high-power inverter device greatly improves the power-saving rate of each motor, and the energy-saving effect is remarkable. Multi-module matrix converters are currently the only matrix converters commercially available for medium and high voltage applications. [0003] The multi-module matrix converter combines traditional power converters with multi-level technology, and has the dual advantages of matrix converters and H-bridge cascaded high-voltage inverters. It can connect multiple independent low-voltagepower unit modules in s...
Claims
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