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Space vector modulation method of star cascade inverter based on α'-β' coordinates

A technology of space vector modulation and cascaded inverters, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc. Issues such as increased number of base vectors

Active Publication Date: 2019-10-01
NANCHANG INST OF TECH
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  • Application Information

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Problems solved by technology

However, with the increase of the cascaded units in the space vector modulation method, the number of basic vectors increases greatly, and corresponding to one basic vector, there are multiple redundant switch state vectors. The selection of switch state vectors and the calculation of their action time are extremely complicated, resulting in Vector modulation method is difficult to implement

Method used

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  • Space vector modulation method of star cascade inverter based on α'-β' coordinates
  • Space vector modulation method of star cascade inverter based on α'-β' coordinates
  • Space vector modulation method of star cascade inverter based on α'-β' coordinates

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Embodiment 1

[0081] Example 1: figure 1 The topology of the inverter circuit with six cascaded H-bridges in the star connection mode is shown, and its phase voltage output levels are ±6, ±5, ±4, ±3, ±2, ±1,0, totaling 13 levels, figure 2 The inverter circuit topology of three cascaded H bridges in the star connection mode shown, the line voltage level output is ±6, ±5, ±4, ±3, ±2, ±1,0, a total of 13 Level, the output line voltage level is exactly the same as the phase voltage level output by the six H-bridge cascaded inverters.

[0082] The phase voltage output reference vector trajectory model of the six H-bridge cascaded inverters in the star connection mode is:

[0083]

[0084] image 3 The schematic diagram of the relationship between the output line voltage and the phase voltage of the star connection shown in the figure, the solid line with arrows in the figure indicates the phase voltage, the dotted line with arrows indicates the line voltage, n H bridges are cascaded, and ...

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Abstract

The invention discloses a space vector modulation method for star cascaded inverters based on α'‑β' coordinates. As the space vector modulation algorithm increases with the increase of cascaded units, the basic vector increases greatly and there are a large number of redundant switch states Vector, the selection of the switch state vector and the calculation of its action time are extremely complicated. The present invention is based on the α'‑β' coordinate system, and utilizes the abscissa, ordinate, and The sum of the coordinates and the ordinate corresponds to the three line voltage vectors of the three-phase inverter, and the relationship between the phase voltage and the line voltage of the star-connected three-phase inverter, and the output of the inverter cascaded by n H-bridges The line voltage signal directly controls the phase voltage of the 2n H-bridge cascaded inverters. This method does not need to calculate the switch state signals corresponding to the basic vectors of each phase, and there is no calculation of a large number of redundant switch state vectors, which greatly simplifies the space vector modulation method of the cascaded multi-level inverter.

Description

technical field [0001] The present invention relates to the field of space vector modulation methods for cascaded multi-level inverters, in particular to a general fast space vector modulation method for cascaded multi-level inverters based on α'-β' coordinate system star connection mode . Background technique [0002] The cascaded multi-level inverter technology is widely used in high-voltage and high-power converters. Its advantage is that it can use the cascade connection of power units to realize voltage division and effectively expand capacity. Bridge cascaded multilevel inverter (also known as H bridge cascaded multilevel inverter) and half bridge cascaded multilevel inverter (also known as modular multilevel inverter, MMC for short) ). There are two wiring modes of high-voltage and large-capacity H-bridge cascaded multi-level converters, star and star. In the star-connection mode, the cascaded modules bear the phase voltage, so the cost can be reduced under the cond...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/007H02M7/4835
Inventor 王翠欧阳俊铭张兴旺曾瑄崔晓斌
Owner NANCHANG INST OF TECH
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