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Phase-shift space vector modulation method based on H-bridge cascaded multi-level inverter

A space vector modulation, cascaded multi-level technology, applied in electrical components, output power conversion devices, AC power input into DC power output and other directions, can solve the difficulty of space vector modulation method implementation, switching state vector switching path Diversity, extremely complicated calculation of switching state vector action time, etc.

Active Publication Date: 2017-10-27
NANCHANG INST OF TECH
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Problems solved by technology

[0004] However, with the increase of the number n of 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, and the selection of switch state vectors and the calculation of their action time are extremely complicated. The switch state vector switching path is diverse, which makes it difficult to realize the space vector modulation method

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  • Phase-shift space vector modulation method based on H-bridge cascaded multi-level inverter
  • Phase-shift space vector modulation method based on H-bridge cascaded multi-level inverter
  • Phase-shift space vector modulation method based on H-bridge cascaded multi-level inverter

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Embodiment 1

[0055] Embodiment 1: as Figure 1~5 , based on the H-bridge cascaded multilevel inverter phase-shifting space vector modulation method under the α′-β′ coordinates, the α′-β′ coordinates are rotated 45° counterclockwise by the traditional α-β coordinates and compress the axis The advantage of this coordinate system is that the basic vectors are all located on the integer coordinate points; the phase-shifted space vector modulation method uses the α'-β' coordinate system to connect the cascaded multilevel inverter Each H-bridge inverter unit is divided into a left half-bridge arm and a right half-bridge arm, and the three left half-bridge arms and three right half-bridge arms of the H-bridge inverter unit at the same level are controlled separately, using two levels Space vector modulation is used to obtain the control signal of the left half-bridge arm, and the signal is phase-shifted by 180° as the control signal of the right half-bridge arm. The modulation signals of the inve...

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Abstract

The invention discloses a phase-shift space vector modulation method based on an H-bridge cascaded multi-level inverter. According to the space vector modulation algorithm, as the number of cascaded units increases, the basic vector greatly increases, a large number of redundant switch state vectors exist, selection of the switch state vector and calculation of the action time thereof are extremely complex, and the like. The method realizes the control of the H-bridge cascaded multi-level inverter based on the alpha'-beta 'coordinate system by using the phase-shift space vector modulation strategy, that is, the cascaded multi-level inverter control is achieved by using the two-level space vector modulation method to perform the appropriate phase shift, each H-bridge inverter unit of the cascaded multi-level inverter is divided into a left half-bridge arm and a right half-bridge arm, two-level space vector modulation is utilized to obtain the a half-bridge arm control signal, the signal is subjected to phase shift of 180 DEG as a right half-arm control signal, and the control signal phase difference between the corresponding bridge arms between the lever and the lever is [Pai] / kn. The modulation method is simple, easy to implement, and good in scalability.

Description

technical field [0001] The invention belongs to the field of inverter modulation, and relates to a phase-shifting space vector modulation method based on H-bridge cascaded multilevel inverters. Background technique [0002] Due to the limitation of the voltage and capacity of power electronic devices, traditional two-level inverters usually adopt the "high-low-high" method to obtain high-voltage and high-power conversion through step-down and step-up of transformers, or use multiple small-capacity inverters The units are multiplexed through multi-winding transformers to realize high-voltage and high-power conversion. The system efficiency of these two high-voltage and high-power converters is relatively low. People hope to use direct high-voltage inverter technology to improve system efficiency. Therefore, the high-voltage and high-power two-level inverter technology based on direct series and parallel connection of power electronic devices has been studied. However, due to ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483
CPCH02M7/483H02M1/007H02M7/4835
Inventor 王翠朱能飞甘江华崔晓斌徐键张兴旺曾瑄
Owner NANCHANG INST OF TECH
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