Carrier PWM-based Z-source two-stage matrix converter modulation method
A technology of matrix converter and modulation method, which is applied in the direction of output power conversion device, AC power input conversion to AC power output, electrical components, etc., can solve the problems such as complex modulation strategy of Z-source two-stage matrix converter, and avoid Trigonometric function calculation, easy to implement, good effect
Active Publication Date: 2018-08-21
NORTHEAST DIANLI UNIVERSITY
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[0004] The purpose of the present invention is to propose a Z-source two-stage matrix converter modulation method based on carrier PWM, which is scientific and reasonable, has strong applicability and good effect, and aims to solve the complex modulation strategy of the existing Z-source two-stage matrix converter. question
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[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0044] figure 1 is the topology diagram of the Z-source two-stage matrix converter, u a , u b , u c Indicates the three-phase input phase voltage; u A , u B , u C Indicates the three-phase output phase voltage;
[0045] First, calculate the duty cycle of each vector of the rectification stage and inverter stage.
[0046] For the rectification stage, set the three-phase input phase voltage as:
[0047]
[0048] Divide the input three-phase input voltage into 6 sectors, such as figure 2 shown. Each sector has the same characteristics: the absolute value of the voltage of one phase is the maximum, while the voltage polarity of the other two phases is opposite. In each sector, the two largest and positive line-to-line voltages are selected to synthesize the output DC voltage. Taking the first sector as an example, u a is p...
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The invention relates to a carrier PWM-based Z-source two-stage matrix converter modulation method. As for a rectification stage, an input phase voltage is divided into six sectors, two line voltagesof which the amplitudes are maximum and of which the polarities are positive are selected in each sector so as to be synthesized into an outputted direct-current voltage, and corresponding duty ratiosare calculated; as for an inversion stage, space voltage vector modulation is adopted, and the duty ratios of effective voltage vectors and zero voltage vectors are calculated according to a sector in which a reference voltage vector is located; and as for a Z-source network, straight-through voltage vectors are properly and reasonably inserted into the zero vectors of the inversion stage, and therefore, a voltage transmission ratio can be improved. The PWM signal diagram of power switches is drawn according to an entire modulation process; and the modulation signals of six sets of bidirectional power switches of the rectification stage and the modulation signals of six sets of power switches of the inversion stage are calculated and compared with the same triangular carrier signal, so that the driving signals of the bidirectional power switches of the rectification stage and the driving signals of the power switches of the inversion stage can be obtained. The method has the advantages of simplicity in calculation and easiness in implementation.
Description
technical field [0001] The invention belongs to the technical field of AC-AC power conversion devices, and in particular relates to a modulation method for a Z-source two-stage matrix converter based on carrier PWM. Background technique [0002] As an AC-AC two-stage converter, the two-stage matrix converter not only makes the input and output a good sinusoidal waveform, but also has two-way transfer of energy, can operate in four quadrants, does not require large-capacity energy storage components, and the input power factor can be It can be tuned and can approximately achieve the first-class advantages. Although it has many advantages, its voltage transfer ratio is low, the maximum is only 0.866, and its output performance is easily affected by abnormal input, which seriously limits its application and promotion. The Z-source network is extended to the two-stage matrix converter, and a Z-source two-stage matrix converter is proposed. Only adding passive components, using...
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IPC IPC(8): H02M5/458
CPCH02M5/4585H02M1/0067
Inventor 王汝田韩旭赵艳峰钟哲夫贾松达王雪
Owner NORTHEAST DIANLI UNIVERSITY