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Star cascaded inverter to be controlled based an alpha'-beta' coordinate system

A cascading inverter, implementation control technology, applied in the output power conversion device, AC power input into DC power output, electrical components and other directions, can solve the difficult control of the inverter, the calculation of the action time is extremely complex and stable Sexual problems, etc.

Active Publication Date: 2018-08-17
NANCHANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 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 The vector modulation method is difficult to implement, and makes the inverter difficult to control and poor in stability

Method used

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  • Star cascaded inverter to be controlled based an alpha'-beta' coordinate system
  • Star cascaded inverter to be controlled based an alpha'-beta' coordinate system
  • Star cascaded inverter to be controlled based an alpha'-beta' coordinate system

Examples

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Embodiment 1

[0080] 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.

[0081] The phase voltage output reference vector trajectory model of the six H-bridge cascaded inverters in the star connection mode is:

[0082]

[0083] 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 star cascaded inverter to be controlled based on an alpha'-beta' coordinate system. Three phases of a star-connected cascaded H-bridge inverter are in star connection, and each phase is cascaded by 2n H-bridges. Each H-bridge includes 4 IGBTs. The star-connected cascaded H-bridge inverter is controlled by a space vector modulation method. The space vector modulation method is based on a space vector trajectory model of a multilevel inverter cascaded by n H-bridges in a star-connected mode. By the use of the unique space vector modulation method, the controlled star-connected cascaded H-bridge inverter runs more stably, the zero sequence voltage is zero, and the control is easy.

Description

technical field [0001] The invention relates to the field of star cascaded multilevel inverters, in particular to a star cascaded inverter controlled based on an α'-β' coordinate system. 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 multilevel converters, star and delta. In the star-connection mode, the cascaded modules bear the phase voltage, so the cost can be reduced under the condition of low voltage. Therefore, the star-connection The cascaded multilevel inverter topology is widely...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/483
CPCH02M7/483H02M7/53875H02M1/007H02M7/53876
Inventor 王翠欧阳俊铭张兴旺曾瑄崔晓斌
Owner NANCHANG INST OF TECH
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