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N input single-phase 2N+2 switching group MMC rectifier and control method thereof

A switch group and rectifier technology, applied in the direction of irreversible AC power input conversion to DC power output, etc., can solve the problems of increasing project costs, achieve the effects of solving voltage equalization problems, improving quality, and reducing project costs

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 rectifiers are required, which greatly increases the engineering cost

Method used

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  • N input single-phase 2N+2 switching group MMC rectifier and control method thereof
  • N input single-phase 2N+2 switching group MMC rectifier and control method thereof
  • N input single-phase 2N+2 switching group MMC rectifier and control method thereof

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Embodiment Construction

[0020] In order to further illustrate the content and characteristics of the present invention, the specific embodiments of the present invention will be described below in conjunction with the accompanying drawings, but the implementation and protection of the present invention are not limited thereto.

[0021] reference figure 1 , The N-input single-phase 2N+2 switch group MMC rectifier of the present invention includes N AC input power sources (u S1 , U S2 ,..., u SN ), N AC inductors (L S1 , L S2 ,..., L SN ), the first bridge arm, the second bridge arm and the load R; 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, the second bridge arm consists of N+1 switch groups (B 11 , B 12 ,..., B 1(N+1) ) And 2 inductors (L 11 , L 12 ) In series; the i-th switch group of the first bridge arm (B 0i ) Consists of n power switch units (SM B0i1 , SM B0i2 ,..., SM B0in ) In series, the i-th switch group B of the ...

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Abstract

The invention provides an N input single-phase 2N+2 switching group MMC rectifier and a control method of the N input single-phase 2N+2 switching group MMC rectifier. The rectifier comprises N alternating-current inputting power supplies, N alternating-current inductors, a first bridge arm, a second bridge arm and a rectification output end load. Each of the first bridge arm and the second bridge arm is formed by connecting N+1 switching groups and two inductors in series. The ith switches in the first bridge arm and the second bridge arm are formed by connecting N power switching units in series and i is selected between 1 and N+1. The two ends of the kth alternating-current power supply serve as the kth circuit input, wherein k is selected between 1 and N and N is larger than two. The rectifier is controlled through carrier phase-shifting PWM, the N inputting alternating-current power supplies are converted into alternating-current inputting of N circuits of 2n+1 levels and after currents are rectified and overlapped, the load is powered. 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 supplies and the problem of voltage sharing of the switching tubes is well solved. The N input single-phase 2N+2 switching group MMC rectifier is applicable to multiple-alternating-current-power-supply-inputting, high-voltage and large-power occasions.

Description

Technical field [0001] The invention relates to the field of modular combined multilevel converters (MMC), in particular to an N-input single-phase 2N+2 switch group MMC rectifier and a control method thereof. Background technique [0002] At present, power rectifiers are developing in the direction of miniaturization, high reliability and low loss. Under this trend, there are two ways to improve rectifiers: reduce passive components or improve the rectifier topology to reduce active components as a direction to reduce active components New developments. Compared with the traditional 4N switch rectifier, the single-phase 2N+2 switching rectifier reduces 2N-2 switches and the corresponding driving circuit, and has certain advantages in the application of considering cost and volume. However, the N channels of single-phase inputs of the 2N+2 switching rectifier are all converted to two levels, and the input AC waveform is relatively poor. In addition, the voltage stress of each s...

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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