Alpha'-Beta' coordinate-based space vector modulation method of star-shaped cascaded inverter

A space vector modulation, cascaded inverter technology, applied in output power conversion devices, conversion of AC power input to DC power output, electrical components, etc. Difficulty in implementing modulation methods

Active Publication Date: 2018-08-31
NANCHANG INST OF TECH
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  • Abstract
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  • Claims
  • 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 redu

Method used

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  • Alpha'-Beta' coordinate-based space vector modulation method of star-shaped cascaded inverter
  • Alpha'-Beta' coordinate-based space vector modulation method of star-shaped cascaded inverter
  • Alpha'-Beta' coordinate-based space vector modulation method of star-shaped cascaded inverter

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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 an Alpha'-Beta' coordinate-based space vector modulation method of a star-shaped cascaded inverter. The basic vector is greatly increased with increasing of cascaded units according to a space vector modulation algorithm, and the problems of a large amount of redundant switch state vectors, very complicated selection of switch state vectors and calculation of action time and the like exist. On the basis of an Alpha'-Beta' coordinate system, a horizontal coordinate, a vertical coordinate and the sum of the horizontal coordinate and the vertical coordinate of a basic vector of the star-connected cascaded multilevel inverter are respectively corresponding to three linear voltage vectors of a three-phase inverter, and phase voltages of 2n H-bridge cascaded inverters aredirectly controlled by employing linear voltage signals output from n H-bridge cascaded inverters according to a relation between a phase voltage and a linear voltage of the star-connected three-phase inverter. By the method, the switch state signal of each phase corresponding to the basic vector is not needed to be calculated, a large amount of redundant switch state vectors are not needed to becalculated, and the space vector modulation method of the cascaded multilevel inverter is greatly simplified.

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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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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