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n-input single-phase 2n+2 switch group mmc rectifier and its control method

A switch group and rectifier technology, which is applied in the direction of converting irreversible AC power input to DC power output, etc., can solve problems such as increasing engineering costs, and achieve the effect of solving the problem of voltage equalization, reducing engineering costs and improving quality.

Active Publication Date: 2017-01-11
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 switch group mmc rectifier and its control method

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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] refer to figure 1 , the N-input single-phase 2N+2 switch group MMC rectifier of the present invention includes N AC input power supplies (u S1 , u S2 ,...,u SN ), N AC inductance (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, and 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 switching units (SM B0i1 , SM B0i2 ,...,SM B0in ) in series, the i-th swi...

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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 module 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 directions for improving rectifiers: reducing passive components or improving rectifier topology to reduce active components as the direction of reducing active components new progress. Compared with the traditional 4N switching rectifier, the single-phase 2N+2 switching rectifier reduces 2N-2 switches and corresponding driving circuits, and has certain advantages in applications considering cost and volume. However, the N 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 switch...

Claims

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Application Information

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