Space vector overmodulation method and device suitable for matrix converter

A matrix converter and space vector technology, applied in output power conversion devices, conversion equipment that can be converted to DC without intermediate conversion, electrical components, etc., can solve the problem of increasing loss, low transmission ratio, and reducing system adjustment speed range and other issues to achieve the effect of improving the voltage transfer ratio

CN112532069AInactive Publication Date: 2021-03-19NAVAL UNIV OF ENG PLA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-03-19
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a space vector overmodulation method and device suitable for a matrix converter. The method comprises the following steps: 1, synthesizing a reference voltage vector through abasic vector, a hexagonal vector and a circular vector; 2, calculating a reference voltage vector amplitude, and determining a modulation ratio; judging a vector combination based on the modulation ratio, if the modulation ratio is not in the range of 0.866-0.909, synthesizing a reference voltage vector by a hexagonal vector and a circular vector, and if the modulation ratio is in the range of 0.866-0.909, synthesizing the reference voltage vector by the hexagonal vector and the circular vector; and 4, based on the weight parameters of the basic vector, the hexagonal vector and the circular vector, calculating the duty ratios of the basic vector, the hexagonal vector and the circular vector according to the volt-second principle of vector synthesis.
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Description

technical field

[0001] The invention relates to the field of matrix converter vector modulation, in particular to a space vector overmodulation method and device suitable for matrix converters. Background technique

[0002] As an AC-AC frequency conversion device, the matrix converter includes a direct matrix converter and an indirect matrix converter, and is composed of an input filter, a main circuit, a clamp circuit and a control circuit. Compared with the traditional AC-DC-AC frequency conversion device, the matrix converter has the advantages of high power density, no intermediate DC energy storage link, can realize four-quadrant operation, and the input and output current can be controlled as sine waves. Power quality regulation and other fields have broad application prospects. When the matrix converter is used to supply power to the motor, its space vector modulation has a low voltage transfer ratio in the linear region, up to 0.866. On the one hand, the low input v...

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] Such as Figure 1-2 As shown, as the first embodiment of the present invention, a kind of space vector overmodulation method suitable for matrix converter is provided, and described method comprises the following steps:

[0049] Step 1, synthesize the reference voltage vector through the basic vector, hexagonal vector and circular vector;

[0050] Among them, the calculation formulas of basic vector, hexagonal vector and circular vector are as follows...