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N output single-phase 2N+2 switching group MMC inverter and control method thereof

A switch group and inverter technology, which is applied in the field of N output single-phase 2N+2 switch group MMC inverter and its control, can solve the problems of increasing engineering cost, solve the problem of voltage equalization, reduce engineering cost, and improve quality Improved effect

Active Publication Date: 2014-04-30
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 N AC lines with different frequencies are connected, 2N MMC converters are required, which greatly increases the engineering cost

Method used

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  • N output single-phase 2N+2 switching group MMC inverter and control method thereof
  • N output single-phase 2N+2 switching group MMC inverter and control method thereof
  • N output single-phase 2N+2 switching group MMC inverter and control method thereof

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Embodiment Construction

[0019] In order to further illustrate the content and features of the present invention, the specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. But the implementation of the present invention is not limited thereto.

[0020] refer to figure 1 , the N output single-phase 2N+2 switch group MMC inverter of the present invention includes a DC power supply Udc , the first bridge arm, the second bridge arm and N loads; the first bridge arm consists of N+1 switch groups (B 01 , B 02 ,...,B 0(N+1) ) and 2 inductors (L 01 , L 02 ) in series, and the second bridge arm consists of N+1 switch groups (B 11 , B 12 ,...,B 1(N+1) ) and 2 inductors (L 01 , L 02 ) in series; the i-th switch group B of the first bridge arm 0i consists of n power switching units (SM B0i1 , SM B0i2 ,...,SM B0in ) in series, the i-th switch group B of the second bridge arm 1i consists of n power switching units SM B1i1 , SM ...

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Abstract

The invention provides an N output single-phase 2N+2 switching group MMC inverter and a control method of the N output single-phase 2N+2 switching group MMC inverter. The inverter comprises a direct-current power supply, a first bridge arm, a second bridge arm and N loads. Each of the two bridge arms is formed by connecting N+1 switching groups and two inductors in series. Each switching group of each bridge arm is formed by connecting n power switching units in series. The two ends of the kth load are connected with the upper ends of the (k+1)th switching groups of the two bridge arms respectively, wherein k is selected between 1 and N-1. The two ends of the Nth load are connected with the lower ends of the Nth switching groups of the two bridge arms respectively. The inverter is controlled through carrier phase-shifting PWM and has alternating current outputting of N circuits of 2n+1 levels. In an MMC power switching unit, the voltage stress borne by each switching tube is only one nth of the voltage of the direct-current power supply and the problem of voltage sharing of the switching tubes is well solved. The N output single-phase 2N+2 switching group MMC inverter is applicable to high-voltage and large-power occasions. The two inductors of each bridge arm can be mutually coupled to form a pair of coupled inductors.

Description

technical field [0001] The invention relates to the field of module combination multilevel (MMC) converters, in particular to an N-output single-phase 2N+2 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 4N switching converter, the single-phase 2N+2 switching converter reduces 2N-2 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, the N single-phase outputs of the 2N+2 switching converter are all two-level, and the output AC waveform is relatively poor. In addition, the voltage stress of each switch in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12
Inventor 张波付坚丘东元
Owner SOUTH CHINA UNIV OF TECH
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