Three-level converter SVPWM method based on vector decomposition

A vector decomposition, three-level technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve problems such as unfavorable hardware implementation

Inactive Publication Date: 2019-05-31
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The realization of the traditional three-level SVPWM method requires a large number of trigonometric function calculations in the calculation of the action time of the basic voltage vector; and a large number of data tables need to be stored in advance, which is not conducive to hardware implementation

Method used

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  • Three-level converter SVPWM method based on vector decomposition
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  • Three-level converter SVPWM method based on vector decomposition

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Embodiment Construction

[0071] In order to make the purpose and technical solution of the present invention clearer, the present invention will be described in further detail below in conjunction with the examples and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0072] Such as figure 1 As shown, a three-level converter SVPWM method based on vector decomposition includes the following steps:

[0073] (1) if figure 2 As shown, the traditional three-level space voltage vector diagram according to: -30°~30°, 30°~90°, 90°~150°, 150°~210°, 210°~270°, 270°~330° °Sequentially divided into areas h, h=1, 2, 3, 4, 5, 6, the area division is shown in Table 1:

[0074] Table 1 Regional division

[0075]

[0076] (2) For the voltage reference vector V in a given three-level space ref * Carry out regional judgment to obtain the region h where it is located; the voltage reference vector V ref * Expressed as follows:

[0077] V ref * =[V * aref V * ...

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Abstract

The invention discloses a three-level converter SVPWM method based on vector decomposition, comprising the following steps of S1, divide a three-level space voltage vector into different regions successively; S2, determining the region h of a given voltage reference vector Vref* in the three-level space by logical operation; S3, converting the Vref* from the three-level space to a two-level space;S4, calculating a three-phase modulation signal in the two-level space; S5, adjusting the three-phase modulation signal obtained in the S4 to restore the three-phase modulation signal in the three-level space; and S6, obtaining a drive signal required for a switching tube in a diode clamp-type three-level converter. Compared with a traditional three-level SVPWM method, the method of the inventiondoes not need to perform trigonometric function calculation or store a large number of vector generation sequence tables in advance, thereby greatly reducing the burden on a microprocessor and improving the modulation calculation efficiency and the calculation speed of the three-level converter.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a vector decomposition-based three-level converter SVPWM (space voltage vector pulse width modulation) method. Background technique [0002] Compared with the traditional two-level inverter, the diode-clamped three-level inverter has the advantages of less voltage stress on the switching tube and less harmonic content in the output voltage. In the field of high voltage and high power, three-level converters have been widely used and have good development prospects. The output characteristics of a voltage source converter mainly depend on the modulation method. At present, the modulation method of the converter is mainly pulse width modulation, including sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM). As far as the modulation method is concerned, SVPWM has been widely used in practical systems because of its high voltage utilization rate...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M7/5387H02M7/5395
Inventor 欧阳森许伟东
Owner SOUTH CHINA UNIV OF TECH
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