Space vector modulation method for delta connection cascaded H-bridge inverter

A space vector modulation and space vector technology, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the extremely complex calculation of the switching state vector action time and the difficulty in implementing the space vector modulation method. And other issues

Active Publication Date: 2018-08-17
NANCHANG INST OF TECH
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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 Vector modulation method is difficult to implement

Method used

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  • Space vector modulation method for delta connection cascaded H-bridge inverter
  • Space vector modulation method for delta connection cascaded H-bridge inverter
  • Space vector modulation method for delta connection cascaded H-bridge inverter

Examples

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Embodiment 1

[0082] Example 1: figure 1 The output line voltage of the H-bridge cascaded inverter indicated by the solid line triangle is equal to the output line voltage of the H-bridge cascaded inverter connected in star form by the dotted line.

[0083] figure 2 The topology of the inverter circuit with six cascaded H-bridges in the delta connection shown in the figure, the line voltage output levels are ±6, ±5, ±4, ±3, ±2, ±1,0, a total of 13 circuits flat, image 3 The inverter circuit topology of three cascaded H bridges in the star connection mode shown, the line voltage output levels are ±6, ±5, ±4, ±3, ±2, ±1,0, a total of 13 It can be concluded that the line voltage level output by the inverter circuit topology of 2n H-bridges cascaded in delta connection is 4n+1, and the inverse of n H-bridges cascaded in star connection The number of line voltage levels output by the variable circuit topology is 4n+1, that is, the number of output line voltage levels in the two connection m...

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Abstract

The invention discloses a space vector modulation method for a delta connection cascaded H-bridge inverter. For the problems of a space vector modulation algorithm that as the number of cascading units increases, the basic vectors are greatly increased, a large number of redundant switch state vectors exist, and the selection of the switch state vectors and the calculation of the action time thereof are extremely complicated, the invention is based on alpha'-beta' coordinates, and uses the abscissa, the ordinate, and the sum of the abscissa and the ordinate of the basic vector of a star connection cascaded multilevel inverter and three line voltage vectors respectively corresponding to a three-phase inverter, and the relationship between the phase voltage of the star connection three-phaseinverter and the line voltage, to synthesize the basic vector of a phase voltage reference vector in a star connection mode as a control signal of the line voltage in a delta connection mode, the method requires neither calculation of the switch state signal of each phase corresponding to the basic vector, nor calculation of a large number of redundant switch state vectors, and the space vector modulation method for the cascaded multilevel inverter is greatly simplified.

Description

technical field [0001] The invention belongs to the field of space vector modulation method of delta-connected cascaded H-bridge multi-level inverters, and relates to a space vector modulation method of delta-connected cascaded H-bridge inverters, in particular to a method in α'-β' A Fast Space Vector Modulation Method for Delta-Connected Cascaded H-Bridge Multilevel Inverters Under Coordinates. 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. High-voltage and high-power H-bridge cascaded multi-level inverters have two wiring modes: star and delta. The cascaded modules in the star-connection mode bear the phase voltage, so the cost can be reduced under low voltage conditions, but its reliability is not good. High, difficult to control under fault conditions; del...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02M7/483
CPCH02M7/483H02M7/53871H02M1/007
Inventor 王翠欧阳俊铭张兴旺曾瑄崔晓斌
Owner NANCHANG INST OF TECH
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