Dual-output single-phase six-switch block MMC inverter and control method thereof

A technology of six-switch groups and switch groups, which is applied in the field of dual-output single-phase six-switch group MMC inverters and its control, can solve problems such as increasing engineering costs, achieve voltage equalization problems, improve quality, and reduce engineering costs. Effect

Active Publication Date: 2014-05-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when two AC lines with different frequencies are connected, two MMC converters are required, which greatly increases the engineering cost

Method used

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  • Dual-output single-phase six-switch block MMC inverter and control method thereof
  • Dual-output single-phase six-switch block MMC inverter and control method thereof
  • Dual-output single-phase six-switch block MMC inverter and control method thereof

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Embodiment Construction

[0019] In order to further illustrate the content and characteristics of the present invention, the implementation of the present invention will be specifically described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto.

[0020] refer to figure 1 , the dual-output single-phase six-switch group MMC inverter of the present invention includes a DC power supply U dc , the first bridge arm, the second bridge arm, the first load and the second load; the first bridge arm and the second bridge arm are all controlled by the upper switch group (H 1 、H 2 ), medium switch group (M 1 , M 2 ), the lower switch group (L 1 , L 2 ) and coupled inductance (L H1 :L L1 , L H2 :L L2 ) in series; the upper switch group H of the first bridge arm 1 consists of N power switching units (SM H11 , SM H12 ,...,SM H1N ) in series, the middle switch group M of the first bridge arm 1 consists of N power switching units ...

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Abstract

The invention discloses a dual-output single-phase six-switch block modular multilevel converter (MMC) inverter and a control method thereof. The inverter is composed of a direct-current power supply, a first bridge arm, a second bridge arm, a first load and a second load. The first bridge arm and the second bridge arm are formed by series connection of upper switch blocks, intermediate switch blocks, lower switch blocks and coupling inductors; the two ends of the first load are respectively connected to the upper ends of the intermediate switch block of the first bridge arm and the intermediate switch block of the second bridge arm; and the two ends of the second load are respectively connected to the lower ends of the intermediate switch block of the first bridge arm and the intermediate switch block of the second bridge arm. According to the inverter, the carrier phase-lifting PWM control is used; and the inverter has two paths of alternating-current outputs with the 2N+1 levels. The voltage stress carried by each switching tube in a power switch unit is one-Nth of that of the direct-current power supply voltage; and thus the inverter is suitable for high-voltage high-power and dual-load occasions. Besides, both the primary side and the secondary side of the coupling inductor of the first bridge arm and the primary side and the second side of the coupling inductor of the second bridge arm can be replaced by two independent inductors of first inductors and second inductors.

Description

technical field [0001] The invention relates to the field of module combined multilevel (MMC) converters, in particular to a dual-output single-phase six-switch group MMC inverter and a control method thereof. Background technique [0002] At present, power converters are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two directions for improving the converter: reducing passive components or improving the topology of the converter to reduce active components. New progress in the direction of source devices. Compared with the traditional eight-switch converter, the single-phase six-switch converter reduces one switch and the corresponding drive circuit, and has certain advantages in the application considering cost and volume. However, the two single-phase outputs of the six-switch converter are both two-level, and the output AC waveform is relatively poor. In addition, the voltage stress of each of the six switche...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5395
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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