Modulation method of z-source two-stage matrix converter based on carrier pwm
A matrix converter and modulation method technology, which is applied in the output power conversion device, AC power input conversion to AC power output, electrical components and other directions, can solve the problems of complex modulation strategy of Z-source two-stage matrix converter, and avoid Trigonometric calculations, easy to implement, good results
Active Publication Date: 2020-06-23
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 with reference to the drawings and specific embodiments.
[0044] figure 1 Is the topological structure diagram of the Z-source two-stage matrix converter, u a , U b , U c Represents three-phase input phase voltage; u A , U B , U C Represents the three-phase output phase voltage;
[0045] First, calculate the duty cycle of each vector of the rectifier stage and the inverter stage.
[0046] For the rectifier stage, suppose the three-phase input phase voltage is:
[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 value, while the voltage polarity of the other two phases is opposite. In each sector, select two maximum and positive line voltages to synthesize the output DC voltage. Take the first sector as an example, u a Is positive and has the largest absolute v...
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The present invention is a Z-source two-stage matrix converter modulation method based on carrier PWM. It is characterized in that, for the rectification stage, the input phase voltage is divided into six sectors, and two sectors with the largest amplitudes are selected in each sector. And the polarity of the line voltage is positive to synthesize the output DC voltage, and calculate the corresponding duty ratio; for the inverter stage, the space voltage vector modulation is used, and the effective voltage vector and the zero voltage vector are calculated according to the sector where the reference voltage vector is located. Duty cycle; for the Z-source network, the straight-through voltage vector is correctly and reasonably inserted into the zero vector of the inverter stage, which improves the voltage transfer ratio. According to the whole modulation process, draw the PWM signal diagram of the power switch, calculate the modulation signals of the six groups of bidirectional power switches of the rectification stage and the modulation signals of the six groups of power switches of the inverter stage, and compare them with the same triangular carrier signal to obtain the rectification stage The driving signal of the bidirectional power switch and the driving signal of the power switch of the inverter stage. Its calculation is simple and easy to implement.
Description
Technical field [0001] The invention belongs to the technical field of AC-AC power conversion devices, and specifically relates to a Z-source two-stage matrix converter modulation method 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 energy transfer, can operate in four quadrants, does not require large-capacity energy storage components, and the input power factor can be Tuning and can approximately achieve the advantages of 1. Although it has many advantages, its voltage transmission ratio is low, the maximum is only 0.866, and its output performance is easily affected by abnormal input, which severely limits its application and promotion. The Z-source network is extended to the two-stage matrix converter, and the Z-source two-stage matrix converter is proposed. Only adding passive components, using the unique through state ...
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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