Modulation method of y-source two-stage matrix converter based on carrier pwm
A matrix converter and carrier wave technology, applied in the direction of output power conversion device, AC power input conversion to AC power output, electrical components, etc., can solve problems such as difficult calculation and complicated modulation method, and achieve good effect and good input and output Waveform quality, easy-to-implement effects
Active Publication Date: 2021-10-01
NORTHEAST DIANLI UNIVERSITY
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[0004] The purpose of the present invention is to propose a scientific, reasonable, and highly applicable modulation method for Y-source dual-stage matrix converters based on carrier PWM, aiming at solving the problem of complex modulation methods and difficult calculations in Y-source dual-stage matrix converters
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[0050] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0051] refer to figure 1 , a Y-source dual-stage matrix converter topology based on carrier PWM modulation method of Y-source dual-stage matrix converter, u a , u b , u c Indicates the three-phase input phase voltage; u A , uB , u C Indicates the three-phase output phase voltage;
[0052] For the rectification stage, set the three-phase input phase voltage as:
[0053]
[0054] Among them, U im is the input phase voltage amplitude, ω i is the angular frequency of the input phase voltage.
[0055] Such as figure 2 As shown, the three-phase input voltage is divided into six sectors. In order to improve the voltage utilization rate, the rectification stage adopts a pulse width modulation strategy without zero vector, and uses the two largest positive polarity line voltages to synthesize the output voltage of the rectificatio...
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The present invention is a modulation method of Y-source two-stage matrix converter based on carrier PWM, and its characteristic is: for the rectification stage, according to the duty cycle of the two line voltages used to synthesize the output voltage and combined with the carrier signal, the rectification The modulation signal of the stage; for the Y source network, according to the equivalent circuit of the straight-through state and the non-straight-through state, calculate the expression of the input voltage of the inverter stage; for the inverter stage, insert Through the vector, calculate the duty cycle of each voltage vector, and combine the carrier signal to calculate the modulation signal of the inverter stage; finally use the modulation signal of the rectification stage, the inverter stage and the modulation signal of the through vector to compare with the triangular carrier signal , to obtain the drive signal of the bidirectional power switch of the rectification stage and the drive signal of the power switch of the inverter stage. The method of the invention effectively solves the problem of complex traditional space vector calculation. It has the advantages of being scientific and reasonable, strong applicability and good effect.
Description
technical field [0001] The invention relates to the technical field of AC-AC power conversion devices, in particular to a modulation method for a Y-source two-stage matrix converter based on carrier PWM. Background technique [0002] As an AC-AC two-stage converter, the two-stage matrix converter can not only make the input and output a good sinusoidal waveform, but also have two-way energy transfer, four-quadrant operation, no need for large-capacity energy storage components, and input power factor can be It can be tuned and can approximately achieve the first-class advantages. Although the two-stage matrix converter has many advantages, its voltage transfer ratio is low, and the maximum voltage transfer ratio is only 0.866, which seriously limits its application and promotion. The purpose of increasing the voltage transfer ratio can be achieved by improving the topology of the dual-stage matrix converter. Embed the Y source network into the topology of the dual-stage ma...
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IPC IPC(8): H02M5/458H02M1/08H02M1/088H02M1/084
CPCH02M1/08H02M1/084H02M1/088H02M5/4585
Inventor 王秀云赵鹏飞王汝田刘闯蔡国伟郭东波
Owner NORTHEAST DIANLI UNIVERSITY