Modulation Method of Dual Output Dual Stage Matrix Converter Based on Carrier PWM
A matrix converter and modulation method technology, which is applied in the output power conversion device, the conversion of AC power input to AC power output, electrical components, etc. Trigonometric function calculations, good input and output waveform quality, easy-to-implement effects
Active Publication Date: 2021-03-19
NORTHEAST DIANLI UNIVERSITY
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[0004] The purpose of the present invention is to propose a dual-output dual-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 dual-output dual-stage matrix converter. question
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[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0038] figure 1 is the topology diagram of dual-output dual-stage matrix converter, u a , u b , u c Indicates the three-phase input phase voltage; u A1 , u B1 , u C1 Indicates the three-phase output phase voltage of inverter stage 1; u A2 , u B2 , u C2 Represents the three-phase output phase voltage of the inverter stage 2; first, calculate the duty cycle of each vector of the rectification stage and the inverter stage.
[0039] For the rectification stage, set the three-phase input phase voltage as:
[0040]
[0041] Divide the 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 polarity of the other two phase voltages is opposite; in each sector, two maximum and positive polarity line voltag...
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The present invention is a modulation method for a dual-output dual-stage matrix converter 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 1 and the inverter stage 2 respectively, the space voltage vector modulation is used, and the effective calculation is based on the sector where the reference voltage vector is located. The duty cycle of the voltage vector and the zero voltage vector; reasonably optimize the combination of the switching states of the rectification stage and the inverter stage. According to the whole modulation process, draw the PWM signal diagram of the power switch, calculate the modulation signals of the six bidirectional power switches of the rectification stage and the modulation signals of the nine 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, and in particular relates to a modulation method of a dual-output dual-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, it can only realize a set of three-phase AC output, which is powerless in the field of wind power generation system, electric vehicle, rail locomotive traction, etc. Stage matrix converter topology (Dual-OutputTwo-StageMatrixConverte, DO-TSMC), the inverter stage only needs nine switches to realize two sets of three-phase AC output, the number o...
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IPC IPC(8): H02M5/458
CPCH02M5/4585H02M1/009
Inventor 王汝田李超超韩旭钟哲夫赵艳峰
Owner NORTHEAST DIANLI UNIVERSITY