A matrix converter for outputting constant-frequency and constant-phase AC voltage and its modulation method
A matrix converter, AC voltage technology, applied in the direction of output power conversion device, conversion equipment that can be converted to DC without intermediate conversion, AC power input conversion to AC power output, etc., can solve the problem of reducing the advantages of the matrix converter, complex problems, to reduce the difficulty of control, improve adaptability, and improve the effect of power factor
Active Publication Date: 2022-03-11
YANSHAN UNIV
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[0003] However, the number of switches in the matrix converter is large, and the bidirectional switches are connected in a back-to-back manner. Therefore, most control strategies use overall control of the bidirectional switches and are relatively complicated, which greatly reduces the advantages of the matrix converter.
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[0028] Below in conjunction with embodiment the present invention is described in further detail:
[0029] Such as Figure 1 to Figure 7 As shown, a matrix converter that outputs fixed-frequency and fixed-phase AC voltage, the input power of this topology is a star-connected three-phase grid voltage e a 、e b 、e c ; The input filter adopts a three-phase L-shaped structure, which consists of L a , Lb and L c Composition; three-phase grid voltage e a 、e b 、e c Respectively and L a , L b and L c Connected at one end; the input filter consists of L a , L b and L c The other ends are respectively connected to the two-way switch group.
[0030] The bidirectional switch group is composed of back-to-back connected S ap1 and S an4 , back-to-back connected S ap3 and S an6 , back-to-back connected S ap5 and S an2 , back-to-back connected S ap4 and S an1 , back-to-back connected S ap6 and S an3 , back-to-back connected S ap2 and S an5 6 pairs of bidirectional switc...
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The invention discloses a matrix converter outputting fixed-frequency and phase-fixed AC voltage and a modulation method thereof, and relates to the technical field of power electronic power converter modulation control. A matrix converter outputting fixed-frequency and phase-fixed AC voltage uses a topology of Three-phase AC / single-phase AC non-isolated matrix converter. Based on this converter topology, a voltage-mode SVM combinatorial logic modulation method is proposed. The voltage-type 6-sector SVM is used as the basic modulation, and the positive and negative polarity selection signal decomposes the logic of the bidirectional controllable switch tube of the matrix converter into a unidirectional controllable switch tube, and decomposes the logic of the bidirectional switch group into positive and negative groups. Phase AC / Single Phase AC topology. Due to the characteristics of the positive and negative polarity selection signals, the positive and negative three-phase AC / single-phase AC topologies work alternately, and the matrix converter outputs an AC voltage with fixed frequency and phase. The invention has the advantages of flexible control of the bidirectional switching tube, strong load adaptability, low switching frequency, bidirectional flow of energy, and the like.
Description
technical field [0001] The invention relates to the technical field of modulation control of power electronic power converters, in particular to a matrix converter outputting fixed-frequency and fixed-phase alternating voltage and a modulation method thereof. Background technique [0002] A converter is a topological device that converts alternating current energy of a certain amplitude and frequency into electrical energy of different amplitude and frequency. The matrix converter is called a "universal converter", which can theoretically directly realize the same or different numbers of input and output phases. The three-phase AC / single-phase AC non-isolated matrix converter evolved on the basis of the three-phase-three-phase matrix converter known as the "universal converter". Compared with the traditional PWM rectifier, this converter has It has obvious advantages, such as direct output of AC voltage, bidirectional flow of energy, high efficiency, high power factor, and ...
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IPC IPC(8): H02M5/22H02M5/293H02M5/297H02M1/088H02M1/12
CPCH02M5/22H02M5/293H02M5/297H02M1/088H02M1/126H02M5/2932
Inventor 闫朝阳姜汉朝奚子伟王璐赵丁选张祝新刘涛
Owner YANSHAN UNIV