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

A space vector modulation, triangular technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc. implementation difficulties

Active Publication Date: 2018-08-07
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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  • Space vector modulation method-based delta connection cascaded H-bridge inverter
  • Space vector modulation method-based delta connection cascaded H-bridge inverter
  • Space vector modulation method-based delta connection cascaded H-bridge inverter

Examples

Experimental program
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Embodiment 1

[0084] 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.

[0085] 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-based delta connection cascaded H-bridge inverter. The three phases of the delta connection cascade H-bridge inverter are in delta connection;2n H-bridges are cascaded so as to form each phase of the inverter; each H-bridge includes 4 IGBTs; a space vector modulation method is adopted to control the delta connection cascaded H-bridge inverter; and the space vector modulation method is formed on the basis of a triangular trajectory model. Since the unique space vector modulation method is adopted, the delta connection cascaded H-bridge inverter can operate more stably and is easy to control.

Description

technical field [0001] The invention belongs to the field of delta-connected cascaded H-bridge multilevel inverters, and relates to a delta-connected cascaded H-bridge inverter based on a space vector modulation method. 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; delta connection cascaded modules need to withstand line voltage, and its short-circuit fault performance is better, suitable for high-voltage, large-capacity systems, typical applica...

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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